From: Tilman Schmidt Date: Tue, 11 Apr 2006 05:55:16 +0000 (-0700) Subject: [PATCH] isdn4linux: Siemens Gigaset drivers: make some variables non-atomic X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=69049cc87dccb1e6fb54aa25c63033efac805dbd;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git [PATCH] isdn4linux: Siemens Gigaset drivers: make some variables non-atomic With Hansjoerg Lipp Replace some atomic_t variables in the Gigaset drivers by non-atomic ones, using spinlocks instead to assure atomicity, as proposed in discussions on the linux-kernel mailing list. Signed-off-by: Hansjoerg Lipp Signed-off-by: Tilman Schmidt Cc: Karsten Keil Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/isdn/gigaset/asyncdata.c b/drivers/isdn/gigaset/asyncdata.c index ce60f6521b9..ce3cd77094b 100644 --- a/drivers/isdn/gigaset/asyncdata.c +++ b/drivers/isdn/gigaset/asyncdata.c @@ -566,19 +566,22 @@ static struct sk_buff *iraw_encode(struct sk_buff *skb, int head, int tail) int gigaset_m10x_send_skb(struct bc_state *bcs, struct sk_buff *skb) { unsigned len = skb->len; + unsigned long flags; if (bcs->proto2 == ISDN_PROTO_L2_HDLC) skb = HDLC_Encode(skb, HW_HDR_LEN, 0); else skb = iraw_encode(skb, HW_HDR_LEN, 0); if (!skb) { - dev_err(bcs->cs->dev, - "unable to allocate memory for encoding!\n"); + err("unable to allocate memory for encoding!\n"); return -ENOMEM; } skb_queue_tail(&bcs->squeue, skb); - tasklet_schedule(&bcs->cs->write_tasklet); + spin_lock_irqsave(&bcs->cs->lock, flags); + if (bcs->cs->connected) + tasklet_schedule(&bcs->cs->write_tasklet); + spin_unlock_irqrestore(&bcs->cs->lock, flags); return len; /* ok so far */ } diff --git a/drivers/isdn/gigaset/bas-gigaset.c b/drivers/isdn/gigaset/bas-gigaset.c index fa37db68c96..f86ed6af3aa 100644 --- a/drivers/isdn/gigaset/bas-gigaset.c +++ b/drivers/isdn/gigaset/bas-gigaset.c @@ -367,7 +367,7 @@ static void cmd_in_timeout(unsigned long data) unsigned long flags; spin_lock_irqsave(&cs->lock, flags); - if (unlikely(!atomic_read(&cs->connected))) { + if (unlikely(!cs->connected)) { gig_dbg(DEBUG_USBREQ, "%s: disconnected", __func__); spin_unlock_irqrestore(&cs->lock, flags); return; @@ -475,11 +475,6 @@ static void read_int_callback(struct urb *urb, struct pt_regs *regs) unsigned l; int channel; - if (unlikely(!atomic_read(&cs->connected))) { - warn("%s: disconnected", __func__); - return; - } - switch (urb->status) { case 0: /* success */ break; @@ -603,7 +598,9 @@ static void read_int_callback(struct urb *urb, struct pt_regs *regs) check_pending(ucs); resubmit: - status = usb_submit_urb(urb, SLAB_ATOMIC); + spin_lock_irqsave(&cs->lock, flags); + status = cs->connected ? usb_submit_urb(urb, SLAB_ATOMIC) : -ENODEV; + spin_unlock_irqrestore(&cs->lock, flags); if (unlikely(status)) { dev_err(cs->dev, "could not resubmit interrupt URB: %s\n", get_usb_statmsg(status)); @@ -628,7 +625,7 @@ static void read_ctrl_callback(struct urb *urb, struct pt_regs *regs) unsigned long flags; spin_lock_irqsave(&cs->lock, flags); - if (unlikely(!atomic_read(&cs->connected))) { + if (unlikely(!cs->connected)) { warn("%s: disconnected", __func__); spin_unlock_irqrestore(&cs->lock, flags); return; @@ -949,6 +946,7 @@ static int submit_iso_write_urb(struct isow_urbctx_t *ucx) struct bas_bc_state *ubc = ucx->bcs->hw.bas; struct usb_iso_packet_descriptor *ifd; int corrbytes, nframe, rc; + unsigned long flags; /* urb->dev is clobbered by USB subsystem */ urb->dev = ucx->bcs->cs->hw.bas->udev; @@ -995,7 +993,11 @@ static int submit_iso_write_urb(struct isow_urbctx_t *ucx) ifd->actual_length = 0; } if ((urb->number_of_packets = nframe) > 0) { - if ((rc = usb_submit_urb(urb, SLAB_ATOMIC)) != 0) { + spin_lock_irqsave(&ucx->bcs->cs->lock, flags); + rc = ucx->bcs->cs->connected ? usb_submit_urb(urb, SLAB_ATOMIC) : -ENODEV; + spin_unlock_irqrestore(&ucx->bcs->cs->lock, flags); + + if (rc) { dev_err(ucx->bcs->cs->dev, "could not submit isochronous write URB: %s\n", get_usb_statmsg(rc)); @@ -1029,11 +1031,6 @@ static void write_iso_tasklet(unsigned long data) /* loop while completed URBs arrive in time */ for (;;) { - if (unlikely(!atomic_read(&cs->connected))) { - warn("%s: disconnected", __func__); - return; - } - if (unlikely(!(atomic_read(&ubc->running)))) { gig_dbg(DEBUG_ISO, "%s: not running", __func__); return; @@ -1190,11 +1187,6 @@ static void read_iso_tasklet(unsigned long data) /* loop while more completed URBs arrive in the meantime */ for (;;) { - if (unlikely(!atomic_read(&cs->connected))) { - warn("%s: disconnected", __func__); - return; - } - /* retrieve URB */ spin_lock_irqsave(&ubc->isoinlock, flags); if (!(urb = ubc->isoindone)) { @@ -1298,7 +1290,10 @@ static void read_iso_tasklet(unsigned long data) urb->dev = bcs->cs->hw.bas->udev; urb->transfer_flags = URB_ISO_ASAP; urb->number_of_packets = BAS_NUMFRAMES; - if ((rc = usb_submit_urb(urb, SLAB_ATOMIC)) != 0) { + spin_lock_irqsave(&cs->lock, flags); + rc = cs->connected ? usb_submit_urb(urb, SLAB_ATOMIC) : -ENODEV; + spin_unlock_irqrestore(&cs->lock, flags); + if (rc) { dev_err(cs->dev, "could not resubmit isochronous read URB: %s\n", get_usb_statmsg(rc)); @@ -1639,6 +1634,7 @@ static void atrdy_timeout(unsigned long data) static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len) { struct bas_cardstate *ucs = cs->hw.bas; + unsigned long flags; int ret; gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len); @@ -1659,7 +1655,11 @@ static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len) (unsigned char*) &ucs->dr_cmd_out, buf, len, write_command_callback, cs); - if ((ret = usb_submit_urb(ucs->urb_cmd_out, SLAB_ATOMIC)) != 0) { + spin_lock_irqsave(&cs->lock, flags); + ret = cs->connected ? usb_submit_urb(ucs->urb_cmd_out, SLAB_ATOMIC) : -ENODEV; + spin_unlock_irqrestore(&cs->lock, flags); + + if (ret) { dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n", get_usb_statmsg(ret)); return ret; @@ -1758,11 +1758,6 @@ static int gigaset_write_cmd(struct cardstate *cs, DEBUG_TRANSCMD : DEBUG_LOCKCMD, "CMD Transmit", len, buf); - if (unlikely(!atomic_read(&cs->connected))) { - err("%s: disconnected", __func__); - return -ENODEV; - } - if (len <= 0) return 0; /* nothing to do */ @@ -2186,6 +2181,7 @@ static int gigaset_probe(struct usb_interface *interface, error: freeurbs(cs); + usb_set_intfdata(interface, NULL); gigaset_unassign(cs); return -ENODEV; } diff --git a/drivers/isdn/gigaset/common.c b/drivers/isdn/gigaset/common.c index f8e5759c636..d00acddd621 100644 --- a/drivers/isdn/gigaset/common.c +++ b/drivers/isdn/gigaset/common.c @@ -129,11 +129,6 @@ int gigaset_enterconfigmode(struct cardstate *cs) { int i, r; - if (!atomic_read(&cs->connected)) { - err("not connected!"); - return -1; - } - cs->control_state = TIOCM_RTS; //FIXME r = setflags(cs, TIOCM_DTR, 200); @@ -176,7 +171,7 @@ static int test_timeout(struct at_state_t *at_state) } if (!gigaset_add_event(at_state->cs, at_state, EV_TIMEOUT, NULL, - atomic_read(&at_state->timer_index), NULL)) { + at_state->timer_index, NULL)) { //FIXME what should we do? } @@ -204,7 +199,7 @@ static void timer_tick(unsigned long data) if (test_timeout(at_state)) timeout = 1; - if (atomic_read(&cs->running)) { + if (cs->running) { mod_timer(&cs->timer, jiffies + msecs_to_jiffies(GIG_TICK)); if (timeout) { gig_dbg(DEBUG_CMD, "scheduling timeout"); @@ -298,20 +293,22 @@ static void clear_events(struct cardstate *cs) { struct event_t *ev; unsigned head, tail; + unsigned long flags; - /* no locking needed (no reader/writer allowed) */ + spin_lock_irqsave(&cs->ev_lock, flags); - head = atomic_read(&cs->ev_head); - tail = atomic_read(&cs->ev_tail); + head = cs->ev_head; + tail = cs->ev_tail; while (tail != head) { ev = cs->events + head; kfree(ev->ptr); - head = (head + 1) % MAX_EVENTS; } - atomic_set(&cs->ev_head, tail); + cs->ev_head = tail; + + spin_unlock_irqrestore(&cs->ev_lock, flags); } struct event_t *gigaset_add_event(struct cardstate *cs, @@ -324,9 +321,9 @@ struct event_t *gigaset_add_event(struct cardstate *cs, spin_lock_irqsave(&cs->ev_lock, flags); - tail = atomic_read(&cs->ev_tail); + tail = cs->ev_tail; next = (tail + 1) % MAX_EVENTS; - if (unlikely(next == atomic_read(&cs->ev_head))) + if (unlikely(next == cs->ev_head)) err("event queue full"); else { event = cs->events + tail; @@ -336,7 +333,7 @@ struct event_t *gigaset_add_event(struct cardstate *cs, event->ptr = ptr; event->arg = arg; event->parameter = parameter; - atomic_set(&cs->ev_tail, next); + cs->ev_tail = next; } spin_unlock_irqrestore(&cs->ev_lock, flags); @@ -454,7 +451,7 @@ void gigaset_freecs(struct cardstate *cs) goto f_bcs; spin_lock_irqsave(&cs->lock, flags); - atomic_set(&cs->running, 0); + cs->running = 0; spin_unlock_irqrestore(&cs->lock, flags); /* event handler and timer are not rescheduled below */ @@ -513,8 +510,8 @@ void gigaset_at_init(struct at_state_t *at_state, struct bc_state *bcs, at_state->pending_commands = 0; at_state->timer_expires = 0; at_state->timer_active = 0; - atomic_set(&at_state->timer_index, 0); - atomic_set(&at_state->seq_index, 0); + at_state->timer_index = 0; + at_state->seq_index = 0; at_state->ConState = 0; for (i = 0; i < STR_NUM; ++i) at_state->str_var[i] = NULL; @@ -665,6 +662,7 @@ struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels, int cidmode, const char *modulename) { struct cardstate *cs = NULL; + unsigned long flags; int i; gig_dbg(DEBUG_INIT, "allocating cs"); @@ -685,11 +683,11 @@ struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels, cs->onechannel = onechannel; cs->ignoreframes = ignoreframes; INIT_LIST_HEAD(&cs->temp_at_states); - atomic_set(&cs->running, 0); + cs->running = 0; init_timer(&cs->timer); /* clear next & prev */ spin_lock_init(&cs->ev_lock); - atomic_set(&cs->ev_tail, 0); - atomic_set(&cs->ev_head, 0); + cs->ev_tail = 0; + cs->ev_head = 0; mutex_init(&cs->mutex); mutex_lock(&cs->mutex); @@ -701,7 +699,7 @@ struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels, cs->open_count = 0; cs->dev = NULL; cs->tty = NULL; - atomic_set(&cs->cidmode, cidmode != 0); + cs->cidmode = cidmode != 0; //if(onechannel) { //FIXME cs->tabnocid = gigaset_tab_nocid_m10x; @@ -737,7 +735,8 @@ struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels, } else gigaset_inbuf_init(cs->inbuf, NULL, cs, INS_command); - atomic_set(&cs->connected, 0); + cs->connected = 0; + cs->isdn_up = 0; gig_dbg(DEBUG_INIT, "setting up cmdbuf"); cs->cmdbuf = cs->lastcmdbuf = NULL; @@ -761,7 +760,9 @@ struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels, gigaset_if_init(cs); - atomic_set(&cs->running, 1); + spin_lock_irqsave(&cs->lock, flags); + cs->running = 1; + spin_unlock_irqrestore(&cs->lock, flags); setup_timer(&cs->timer, timer_tick, (unsigned long) cs); cs->timer.expires = jiffies + msecs_to_jiffies(GIG_TICK); /* FIXME: can jiffies increase too much until the timer is added? @@ -871,10 +872,14 @@ static void cleanup_cs(struct cardstate *cs) int gigaset_start(struct cardstate *cs) { + unsigned long flags; + if (mutex_lock_interruptible(&cs->mutex)) return 0; - atomic_set(&cs->connected, 1); + spin_lock_irqsave(&cs->lock, flags); + cs->connected = 1; + spin_unlock_irqrestore(&cs->lock, flags); if (atomic_read(&cs->mstate) != MS_LOCKED) { cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR|TIOCM_RTS); @@ -950,11 +955,6 @@ void gigaset_stop(struct cardstate *cs) { mutex_lock(&cs->mutex); - /* clear device sysfs */ - gigaset_free_dev_sysfs(cs); - - atomic_set(&cs->connected, 0); - cs->waiting = 1; if (!gigaset_add_event(cs, &cs->at_state, EV_STOP, NULL, 0, NULL)) { @@ -970,8 +970,8 @@ void gigaset_stop(struct cardstate *cs) //FIXME } - /* Tell the LL that the device is not available .. */ - gigaset_i4l_cmd(cs, ISDN_STAT_STOP); // FIXME move to event layer? + /* clear device sysfs */ + gigaset_free_dev_sysfs(cs); cleanup_cs(cs); diff --git a/drivers/isdn/gigaset/ev-layer.c b/drivers/isdn/gigaset/ev-layer.c index 2e826d051c8..1ba3424a286 100644 --- a/drivers/isdn/gigaset/ev-layer.c +++ b/drivers/isdn/gigaset/ev-layer.c @@ -482,14 +482,6 @@ static int isdn_gethex(char *p) return v; } -static inline void new_index(atomic_t *index, int max) -{ - if (atomic_read(index) == max) //FIXME race? - atomic_set(index, 0); - else - atomic_inc(index); -} - /* retrieve CID from parsed response * returns 0 if no CID, -1 if invalid CID, or CID value 1..65535 */ @@ -581,8 +573,8 @@ void gigaset_handle_modem_response(struct cardstate *cs) } spin_lock_irqsave(&cs->ev_lock, flags); - head = atomic_read(&cs->ev_head); - tail = atomic_read(&cs->ev_tail); + head = cs->ev_head; + tail = cs->ev_tail; abort = 1; curarg = 0; @@ -715,7 +707,7 @@ void gigaset_handle_modem_response(struct cardstate *cs) break; } - atomic_set(&cs->ev_tail, tail); + cs->ev_tail = tail; spin_unlock_irqrestore(&cs->ev_lock, flags); if (curarg != params) @@ -734,14 +726,16 @@ static void disconnect(struct at_state_t **at_state_p) struct bc_state *bcs = (*at_state_p)->bcs; struct cardstate *cs = (*at_state_p)->cs; - new_index(&(*at_state_p)->seq_index, MAX_SEQ_INDEX); + spin_lock_irqsave(&cs->lock, flags); + ++(*at_state_p)->seq_index; /* revert to selected idle mode */ - if (!atomic_read(&cs->cidmode)) { + if (!cs->cidmode) { cs->at_state.pending_commands |= PC_UMMODE; atomic_set(&cs->commands_pending, 1); //FIXME gig_dbg(DEBUG_CMD, "Scheduling PC_UMMODE"); } + spin_unlock_irqrestore(&cs->lock, flags); if (bcs) { /* B channel assigned: invoke hardware specific handler */ @@ -933,17 +927,21 @@ static void bchannel_up(struct bc_state *bcs) gigaset_i4l_channel_cmd(bcs, ISDN_STAT_BCONN); } -static void start_dial(struct at_state_t *at_state, void *data, int seq_index) +static void start_dial(struct at_state_t *at_state, void *data, unsigned seq_index) { struct bc_state *bcs = at_state->bcs; struct cardstate *cs = at_state->cs; int retval; + unsigned long flags; bcs->chstate |= CHS_NOTIFY_LL; - //atomic_set(&bcs->status, BCS_INIT); - if (atomic_read(&at_state->seq_index) != seq_index) + spin_lock_irqsave(&cs->lock, flags); + if (at_state->seq_index != seq_index) { + spin_unlock_irqrestore(&cs->lock, flags); goto error; + } + spin_unlock_irqrestore(&cs->lock, flags); retval = gigaset_isdn_setup_dial(at_state, data); if (retval != 0) @@ -988,6 +986,7 @@ static void do_start(struct cardstate *cs) if (atomic_read(&cs->mstate) != MS_LOCKED) schedule_init(cs, MS_INIT); + cs->isdn_up = 1; gigaset_i4l_cmd(cs, ISDN_STAT_RUN); // FIXME: not in locked mode // FIXME 2: only after init sequence @@ -1003,6 +1002,12 @@ static void finish_shutdown(struct cardstate *cs) atomic_set(&cs->mode, M_UNKNOWN); } + /* Tell the LL that the device is not available .. */ + if (cs->isdn_up) { + cs->isdn_up = 0; + gigaset_i4l_cmd(cs, ISDN_STAT_STOP); + } + /* The rest is done by cleanup_cs () in user mode. */ cs->cmd_result = -ENODEV; @@ -1025,6 +1030,12 @@ static void do_shutdown(struct cardstate *cs) static void do_stop(struct cardstate *cs) { + unsigned long flags; + + spin_lock_irqsave(&cs->lock, flags); + cs->connected = 0; + spin_unlock_irqrestore(&cs->lock, flags); + do_shutdown(cs); } @@ -1153,7 +1164,7 @@ static int do_unlock(struct cardstate *cs) atomic_set(&cs->mstate, MS_UNINITIALIZED); atomic_set(&cs->mode, M_UNKNOWN); gigaset_free_channels(cs); - if (atomic_read(&cs->connected)) + if (cs->connected) schedule_init(cs, MS_INIT); return 0; @@ -1185,11 +1196,14 @@ static void do_action(int action, struct cardstate *cs, cs->at_state.pending_commands &= ~PC_INIT; cs->cur_at_seq = SEQ_NONE; atomic_set(&cs->mode, M_UNIMODEM); - if (!atomic_read(&cs->cidmode)) { + spin_lock_irqsave(&cs->lock, flags); + if (!cs->cidmode) { + spin_unlock_irqrestore(&cs->lock, flags); gigaset_free_channels(cs); atomic_set(&cs->mstate, MS_READY); break; } + spin_unlock_irqrestore(&cs->lock, flags); cs->at_state.pending_commands |= PC_CIDMODE; atomic_set(&cs->commands_pending, 1); gig_dbg(DEBUG_CMD, "Scheduling PC_CIDMODE"); @@ -1536,8 +1550,9 @@ static void do_action(int action, struct cardstate *cs, /* events from the proc file system */ // FIXME without ACT_xxxx? case ACT_PROC_CIDMODE: - if (ev->parameter != atomic_read(&cs->cidmode)) { - atomic_set(&cs->cidmode, ev->parameter); + spin_lock_irqsave(&cs->lock, flags); + if (ev->parameter != cs->cidmode) { + cs->cidmode = ev->parameter; if (ev->parameter) { cs->at_state.pending_commands |= PC_CIDMODE; gig_dbg(DEBUG_CMD, "Scheduling PC_CIDMODE"); @@ -1547,6 +1562,7 @@ static void do_action(int action, struct cardstate *cs, } atomic_set(&cs->commands_pending, 1); } + spin_unlock_irqrestore(&cs->lock, flags); cs->waiting = 0; wake_up(&cs->waitqueue); break; @@ -1615,8 +1631,9 @@ static void process_event(struct cardstate *cs, struct event_t *ev) /* Setting the pointer to the dial array */ rep = at_state->replystruct; + spin_lock_irqsave(&cs->lock, flags); if (ev->type == EV_TIMEOUT) { - if (ev->parameter != atomic_read(&at_state->timer_index) + if (ev->parameter != at_state->timer_index || !at_state->timer_active) { ev->type = RSP_NONE; /* old timeout */ gig_dbg(DEBUG_ANY, "old timeout"); @@ -1625,6 +1642,7 @@ static void process_event(struct cardstate *cs, struct event_t *ev) else gig_dbg(DEBUG_ANY, "stopped waiting"); } + spin_unlock_irqrestore(&cs->lock, flags); /* if the response belongs to a variable in at_state->int_var[VAR_XXXX] or at_state->str_var[STR_XXXX], set it */ @@ -1686,7 +1704,7 @@ static void process_event(struct cardstate *cs, struct event_t *ev) } else { /* Send command to modem if not NULL... */ if (p_command/*rep->command*/) { - if (atomic_read(&cs->connected)) + if (cs->connected) send_command(cs, p_command, sendcid, cs->dle, GFP_ATOMIC); @@ -1703,8 +1721,7 @@ static void process_event(struct cardstate *cs, struct event_t *ev) } else if (rep->timeout > 0) { /* new timeout */ at_state->timer_expires = rep->timeout * 10; at_state->timer_active = 1; - new_index(&at_state->timer_index, - MAX_TIMER_INDEX); + ++at_state->timer_index; } spin_unlock_irqrestore(&cs->lock, flags); } @@ -1724,6 +1741,7 @@ static void process_command_flags(struct cardstate *cs) struct bc_state *bcs; int i; int sequence; + unsigned long flags; atomic_set(&cs->commands_pending, 0); @@ -1773,8 +1791,9 @@ static void process_command_flags(struct cardstate *cs) } /* only switch back to unimodem mode, if no commands are pending and no channels are up */ + spin_lock_irqsave(&cs->lock, flags); if (cs->at_state.pending_commands == PC_UMMODE - && !atomic_read(&cs->cidmode) + && !cs->cidmode && list_empty(&cs->temp_at_states) && atomic_read(&cs->mode) == M_CID) { sequence = SEQ_UMMODE; @@ -1788,6 +1807,7 @@ static void process_command_flags(struct cardstate *cs) } } } + spin_unlock_irqrestore(&cs->lock, flags); cs->at_state.pending_commands &= ~PC_UMMODE; if (sequence != SEQ_NONE) { schedule_sequence(cs, at_state, sequence); @@ -1900,18 +1920,21 @@ static void process_events(struct cardstate *cs) int i; int check_flags = 0; int was_busy; + unsigned long flags; - /* no locking needed (only one reader) */ - head = atomic_read(&cs->ev_head); + spin_lock_irqsave(&cs->ev_lock, flags); + head = cs->ev_head; for (i = 0; i < 2 * MAX_EVENTS; ++i) { - tail = atomic_read(&cs->ev_tail); + tail = cs->ev_tail; if (tail == head) { if (!check_flags && !atomic_read(&cs->commands_pending)) break; check_flags = 0; + spin_unlock_irqrestore(&cs->ev_lock, flags); process_command_flags(cs); - tail = atomic_read(&cs->ev_tail); + spin_lock_irqsave(&cs->ev_lock, flags); + tail = cs->ev_tail; if (tail == head) { if (!atomic_read(&cs->commands_pending)) break; @@ -1921,16 +1944,20 @@ static void process_events(struct cardstate *cs) ev = cs->events + head; was_busy = cs->cur_at_seq != SEQ_NONE; + spin_unlock_irqrestore(&cs->ev_lock, flags); process_event(cs, ev); + spin_lock_irqsave(&cs->ev_lock, flags); kfree(ev->ptr); ev->ptr = NULL; if (was_busy && cs->cur_at_seq == SEQ_NONE) check_flags = 1; head = (head + 1) % MAX_EVENTS; - atomic_set(&cs->ev_head, head); + cs->ev_head = head; } + spin_unlock_irqrestore(&cs->ev_lock, flags); + if (i == 2 * MAX_EVENTS) { dev_err(cs->dev, "infinite loop in process_events; aborting.\n"); diff --git a/drivers/isdn/gigaset/gigaset.h b/drivers/isdn/gigaset/gigaset.h index 39a883ebc69..350dfcf15e6 100644 --- a/drivers/isdn/gigaset/gigaset.h +++ b/drivers/isdn/gigaset/gigaset.h @@ -55,9 +55,6 @@ #define GIG_RETRYCID #define GIG_X75 -#define MAX_TIMER_INDEX 1000 -#define MAX_SEQ_INDEX 1000 - #define GIG_TICK 100 /* in milliseconds */ /* timeout values (unit: 1 sec) */ @@ -375,7 +372,7 @@ struct at_state_t { struct list_head list; int waiting; int getstring; - atomic_t timer_index; + unsigned timer_index; unsigned long timer_expires; int timer_active; unsigned int ConState; /* State of connection */ @@ -384,7 +381,7 @@ struct at_state_t { int int_var[VAR_NUM]; /* see VAR_XXXX */ char *str_var[STR_NUM]; /* see STR_XXXX */ unsigned pending_commands; /* see PC_XXXX */ - atomic_t seq_index; + unsigned seq_index; struct cardstate *cs; struct bc_state *bcs; @@ -484,10 +481,11 @@ struct cardstate { unsigned fwver[4]; int gotfwver; - atomic_t running; /* !=0 if events are handled */ - atomic_t connected; /* !=0 if hardware is connected */ + unsigned running; /* !=0 if events are handled */ + unsigned connected; /* !=0 if hardware is connected */ + unsigned isdn_up; /* !=0 after ISDN_STAT_RUN */ - atomic_t cidmode; + unsigned cidmode; int myid; /* id for communication with LL */ isdn_if iif; @@ -528,7 +526,7 @@ struct cardstate { /* event queue */ struct event_t events[MAX_EVENTS]; - atomic_t ev_tail, ev_head; + unsigned ev_tail, ev_head; spinlock_t ev_lock; /* current modem response */ @@ -824,7 +822,7 @@ static inline void gigaset_schedule_event(struct cardstate *cs) { unsigned long flags; spin_lock_irqsave(&cs->lock, flags); - if (atomic_read(&cs->running)) + if (cs->running) tasklet_schedule(&cs->event_tasklet); spin_unlock_irqrestore(&cs->lock, flags); } diff --git a/drivers/isdn/gigaset/i4l.c b/drivers/isdn/gigaset/i4l.c index 7059b84b96a..0815dbfb829 100644 --- a/drivers/isdn/gigaset/i4l.c +++ b/drivers/isdn/gigaset/i4l.c @@ -56,11 +56,6 @@ static int writebuf_from_LL(int driverID, int channel, int ack, "Receiving data from LL (id: %d, ch: %d, ack: %d, sz: %d)", driverID, channel, ack, len); - if (!atomic_read(&cs->connected)) { - err("%s: disconnected", __func__); - return -ENODEV; - } - if (!len) { if (ack) notice("%s: not ACKing empty packet", __func__); @@ -78,7 +73,7 @@ static int writebuf_from_LL(int driverID, int channel, int ack, len, skblen, (unsigned) skb->head[0], (unsigned) skb->head[1]); /* pass to device-specific module */ - return cs->ops->send_skb(bcs, skb); + return cs->ops->send_skb(bcs, skb); //FIXME cs->ops->send_skb() must handle !cs->connected correctly } void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb) @@ -119,11 +114,12 @@ static int command_from_LL(isdn_ctrl *cntrl) struct bc_state *bcs; int retval = 0; struct setup_parm *sp; + unsigned param; + unsigned long flags; gigaset_debugdrivers(); - //FIXME "remove test for &connected" - if ((!cs || !atomic_read(&cs->connected))) { + if (!cs) { warn("LL tried to access unknown device with nr. %d", cntrl->driver); return -ENODEV; @@ -166,8 +162,11 @@ static int command_from_LL(isdn_ctrl *cntrl) } *sp = cntrl->parm.setup; - if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, sp, - atomic_read(&bcs->at_state.seq_index), + spin_lock_irqsave(&cs->lock, flags); + param = bcs->at_state.seq_index; + spin_unlock_irqrestore(&cs->lock, flags); + + if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, sp, param, NULL)) { //FIXME what should we do? kfree(sp); diff --git a/drivers/isdn/gigaset/interface.c b/drivers/isdn/gigaset/interface.c index ac408acaaf1..08e4c4eea14 100644 --- a/drivers/isdn/gigaset/interface.c +++ b/drivers/isdn/gigaset/interface.c @@ -33,7 +33,7 @@ static int if_lock(struct cardstate *cs, int *arg) } if (!cmd && atomic_read(&cs->mstate) == MS_LOCKED - && atomic_read(&cs->connected)) { + && cs->connected) { cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR|TIOCM_RTS); cs->ops->baud_rate(cs, B115200); cs->ops->set_line_ctrl(cs, CS8); @@ -107,6 +107,11 @@ static int if_config(struct cardstate *cs, int *arg) if (atomic_read(&cs->mstate) != MS_LOCKED) return -EBUSY; + if (!cs->connected) { + err("not connected!"); + return -ENODEV; + } + *arg = 0; return gigaset_enterconfigmode(cs); } @@ -246,7 +251,7 @@ static int if_ioctl(struct tty_struct *tty, struct file *file, break; case GIGASET_BRKCHARS: //FIXME test if MS_LOCKED - if (!atomic_read(&cs->connected)) { + if (!cs->connected) { gig_dbg(DEBUG_ANY, "can't communicate with unplugged device"); retval = -ENODEV; @@ -327,7 +332,7 @@ static int if_tiocmset(struct tty_struct *tty, struct file *file, if (mutex_lock_interruptible(&cs->mutex)) return -ERESTARTSYS; // FIXME -EINTR? - if (!atomic_read(&cs->connected)) { + if (!cs->connected) { gig_dbg(DEBUG_ANY, "can't communicate with unplugged device"); retval = -ENODEV; } else { @@ -362,7 +367,7 @@ static int if_write(struct tty_struct *tty, const unsigned char *buf, int count) else if (atomic_read(&cs->mstate) != MS_LOCKED) { warn("can't write to unlocked device"); retval = -EBUSY; - } else if (!atomic_read(&cs->connected)) { + } else if (!cs->connected) { gig_dbg(DEBUG_ANY, "can't write to unplugged device"); retval = -EBUSY; //FIXME } else { @@ -396,7 +401,7 @@ static int if_write_room(struct tty_struct *tty) else if (atomic_read(&cs->mstate) != MS_LOCKED) { warn("can't write to unlocked device"); retval = -EBUSY; //FIXME - } else if (!atomic_read(&cs->connected)) { + } else if (!cs->connected) { gig_dbg(DEBUG_ANY, "can't write to unplugged device"); retval = -EBUSY; //FIXME } else @@ -428,7 +433,7 @@ static int if_chars_in_buffer(struct tty_struct *tty) else if (atomic_read(&cs->mstate) != MS_LOCKED) { warn("can't write to unlocked device"); retval = -EBUSY; - } else if (!atomic_read(&cs->connected)) { + } else if (!cs->connected) { gig_dbg(DEBUG_ANY, "can't write to unplugged device"); retval = -EBUSY; //FIXME } else @@ -508,7 +513,7 @@ static void if_set_termios(struct tty_struct *tty, struct termios *old) goto out; } - if (!atomic_read(&cs->connected)) { + if (!cs->connected) { gig_dbg(DEBUG_ANY, "can't communicate with unplugged device"); goto out; } diff --git a/drivers/isdn/gigaset/isocdata.c b/drivers/isdn/gigaset/isocdata.c index 2f1628734a3..45f017ed6e8 100644 --- a/drivers/isdn/gigaset/isocdata.c +++ b/drivers/isdn/gigaset/isocdata.c @@ -990,13 +990,17 @@ void gigaset_isoc_input(struct inbuf_t *inbuf) int gigaset_isoc_send_skb(struct bc_state *bcs, struct sk_buff *skb) { int len = skb->len; + unsigned long flags; skb_queue_tail(&bcs->squeue, skb); gig_dbg(DEBUG_ISO, "%s: skb queued, qlen=%d", __func__, skb_queue_len(&bcs->squeue)); /* tasklet submits URB if necessary */ - tasklet_schedule(&bcs->hw.bas->sent_tasklet); + spin_lock_irqsave(&bcs->cs->lock, flags); + if (bcs->cs->connected) + tasklet_schedule(&bcs->hw.bas->sent_tasklet); + spin_unlock_irqrestore(&bcs->cs->lock, flags); return len; /* ok so far */ } diff --git a/drivers/isdn/gigaset/proc.c b/drivers/isdn/gigaset/proc.c index 80d8ef1874f..d267a636b53 100644 --- a/drivers/isdn/gigaset/proc.c +++ b/drivers/isdn/gigaset/proc.c @@ -19,8 +19,15 @@ static ssize_t show_cidmode(struct device *dev, struct device_attribute *attr, char *buf) { + int ret; + unsigned long flags; struct cardstate *cs = dev_get_drvdata(dev); - return sprintf(buf, "%d\n", atomic_read(&cs->cidmode)); + + spin_lock_irqsave(&cs->lock, flags); + ret = sprintf(buf, "%u\n", cs->cidmode); + spin_unlock_irqrestore(&cs->lock, flags); + + return ret; } static ssize_t set_cidmode(struct device *dev, struct device_attribute *attr, diff --git a/drivers/isdn/gigaset/usb-gigaset.c b/drivers/isdn/gigaset/usb-gigaset.c index fe8435b8fa9..bfb73fd5077 100644 --- a/drivers/isdn/gigaset/usb-gigaset.c +++ b/drivers/isdn/gigaset/usb-gigaset.c @@ -371,13 +371,14 @@ static void gigaset_read_int_callback(struct urb *urb, struct pt_regs *regs) int r; unsigned numbytes; unsigned char *src; - - if (!atomic_read(&cs->connected)) { - err("%s: disconnected", __func__); - return; - } + unsigned long flags; if (!urb->status) { + if (!cs->connected) { + err("%s: disconnected", __func__); /* should never happen */ + return; + } + numbytes = urb->actual_length; if (numbytes) { @@ -399,12 +400,19 @@ static void gigaset_read_int_callback(struct urb *urb, struct pt_regs *regs) /* The urb might have been killed. */ gig_dbg(DEBUG_ANY, "%s - nonzero read bulk status received: %d", __func__, urb->status); - if (urb->status != -ENOENT) /* not killed */ + if (urb->status != -ENOENT) { /* not killed */ + if (!cs->connected) { + err("%s: disconnected", __func__); /* should never happen */ + return; + } resubmit = 1; + } } if (resubmit) { - r = usb_submit_urb(urb, SLAB_ATOMIC); + spin_lock_irqsave(&cs->lock, flags); + r = cs->connected ? usb_submit_urb(urb, SLAB_ATOMIC) : -ENODEV; + spin_unlock_irqrestore(&cs->lock, flags); if (r) dev_err(cs->dev, "error %d when resubmitting urb.\n", -r); @@ -416,21 +424,22 @@ static void gigaset_read_int_callback(struct urb *urb, struct pt_regs *regs) static void gigaset_write_bulk_callback(struct urb *urb, struct pt_regs *regs) { struct cardstate *cs = urb->context; + unsigned long flags; -#ifdef CONFIG_GIGASET_DEBUG - if (!atomic_read(&cs->connected)) { - err("%s: not connected", __func__); - return; - } -#endif if (urb->status) dev_err(cs->dev, "bulk transfer failed (status %d)\n", -urb->status); /* That's all we can do. Communication problems are handled by timeouts or network protocols. */ - atomic_set(&cs->hw.usb->busy, 0); - tasklet_schedule(&cs->write_tasklet); + spin_lock_irqsave(&cs->lock, flags); + if (!cs->connected) { + err("%s: not connected", __func__); + } else { + atomic_set(&cs->hw.usb->busy, 0); + tasklet_schedule(&cs->write_tasklet); + } + spin_unlock_irqrestore(&cs->lock, flags); } static int send_cb(struct cardstate *cs, struct cmdbuf_t *cb) @@ -465,6 +474,8 @@ static int send_cb(struct cardstate *cs, struct cmdbuf_t *cb) } if (cb) { count = min(cb->len, ucs->bulk_out_size); + gig_dbg(DEBUG_OUTPUT, "send_cb: send %d bytes", count); + usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev, usb_sndbulkpipe(ucs->udev, ucs->bulk_out_endpointAddr & 0x0f), @@ -474,14 +485,15 @@ static int send_cb(struct cardstate *cs, struct cmdbuf_t *cb) cb->offset += count; cb->len -= count; atomic_set(&ucs->busy, 1); - gig_dbg(DEBUG_OUTPUT, "send_cb: send %d bytes", count); - status = usb_submit_urb(ucs->bulk_out_urb, SLAB_ATOMIC); + spin_lock_irqsave(&cs->lock, flags); + status = cs->connected ? usb_submit_urb(ucs->bulk_out_urb, SLAB_ATOMIC) : -ENODEV; + spin_unlock_irqrestore(&cs->lock, flags); + if (status) { atomic_set(&ucs->busy, 0); - dev_err(cs->dev, - "could not submit urb (error %d)\n", - -status); + err("could not submit urb (error %d)\n", + -status); cb->len = 0; /* skip urb => remove cb+wakeup in next loop cycle */ } @@ -502,11 +514,6 @@ static int gigaset_write_cmd(struct cardstate *cs, const unsigned char *buf, DEBUG_TRANSCMD : DEBUG_LOCKCMD, "CMD Transmit", len, buf); - if (!atomic_read(&cs->connected)) { - err("%s: not connected", __func__); - return -ENODEV; - } - if (len <= 0) return 0; @@ -533,7 +540,10 @@ static int gigaset_write_cmd(struct cardstate *cs, const unsigned char *buf, cs->lastcmdbuf = cb; spin_unlock_irqrestore(&cs->cmdlock, flags); - tasklet_schedule(&cs->write_tasklet); + spin_lock_irqsave(&cs->lock, flags); + if (cs->connected) + tasklet_schedule(&cs->write_tasklet); + spin_unlock_irqrestore(&cs->lock, flags); return len; } @@ -629,6 +639,7 @@ static int write_modem(struct cardstate *cs) int count; struct bc_state *bcs = &cs->bcs[0]; /* only one channel */ struct usb_cardstate *ucs = cs->hw.usb; + unsigned long flags; gig_dbg(DEBUG_WRITE, "len: %d...", bcs->tx_skb->len); @@ -644,20 +655,27 @@ static int write_modem(struct cardstate *cs) count = min(bcs->tx_skb->len, (unsigned) ucs->bulk_out_size); memcpy(ucs->bulk_out_buffer, bcs->tx_skb->data, count); skb_pull(bcs->tx_skb, count); - - usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev, - usb_sndbulkpipe(ucs->udev, - ucs->bulk_out_endpointAddr & 0x0f), - ucs->bulk_out_buffer, count, - gigaset_write_bulk_callback, cs); atomic_set(&ucs->busy, 1); gig_dbg(DEBUG_OUTPUT, "write_modem: send %d bytes", count); - ret = usb_submit_urb(ucs->bulk_out_urb, SLAB_ATOMIC); + spin_lock_irqsave(&cs->lock, flags); + if (cs->connected) { + usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev, + usb_sndbulkpipe(ucs->udev, + ucs->bulk_out_endpointAddr & 0x0f), + ucs->bulk_out_buffer, count, + gigaset_write_bulk_callback, cs); + ret = usb_submit_urb(ucs->bulk_out_urb, SLAB_ATOMIC); + } else { + ret = -ENODEV; + } + spin_unlock_irqrestore(&cs->lock, flags); + if (ret) { - dev_err(cs->dev, "could not submit urb (error %d)\n", -ret); + err("could not submit urb (error %d)\n", -ret); atomic_set(&ucs->busy, 0); } + if (!bcs->tx_skb->len) { /* skb sent completely */ gigaset_skb_sent(bcs, bcs->tx_skb); //FIXME also, when ret<0?