From: Tomas Winkler Date: Mon, 4 May 2015 06:43:53 +0000 (+0300) Subject: mei: revamp client connection X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0c53357ca4b3a03aafc211de663e84dba7c628e2;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git mei: revamp client connection Simplify connect state machine by changing the logic around Connection request in progress - only check if we have a callback in relevant queue. Extract common code into mei_cl_send_connect() function Signed-off-by: Tomas Winkler Signed-off-by: Alexander Usyskin Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c index 873c1b6e45e8..00b0cb2075fb 100644 --- a/drivers/misc/mei/bus.c +++ b/drivers/misc/mei/bus.c @@ -436,6 +436,12 @@ int mei_cl_enable_device(struct mei_cl_device *device) mutex_lock(&dev->device_lock); + if (mei_cl_is_connected(cl)) { + mutex_unlock(&dev->device_lock); + dev_warn(dev->dev, "Already connected"); + return -EBUSY; + } + err = mei_cl_connect(cl, NULL); if (err < 0) { mutex_unlock(&dev->device_lock); diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c index e572ecd5a68d..3f8bb90dbb58 100644 --- a/drivers/misc/mei/client.c +++ b/drivers/misc/mei/client.c @@ -881,27 +881,82 @@ out: * * Return: true if other client is connected, false - otherwise. */ -bool mei_cl_is_other_connecting(struct mei_cl *cl) +static bool mei_cl_is_other_connecting(struct mei_cl *cl) { struct mei_device *dev; - struct mei_cl *ocl; /* the other client */ - - if (WARN_ON(!cl || !cl->dev)) - return false; + struct mei_cl_cb *cb; dev = cl->dev; - list_for_each_entry(ocl, &dev->file_list, link) { - if (ocl->state == MEI_FILE_CONNECTING && - ocl != cl && - cl->me_client_id == ocl->me_client_id) + list_for_each_entry(cb, &dev->ctrl_rd_list.list, list) { + if (cb->fop_type == MEI_FOP_CONNECT && + cl->me_client_id == cb->cl->me_client_id) return true; - } return false; } +/** + * mei_cl_send_connect - send connect request + * + * @cl: host client + * @cb: callback block + * + * Return: 0, OK; otherwise, error. + */ +static int mei_cl_send_connect(struct mei_cl *cl, struct mei_cl_cb *cb) +{ + struct mei_device *dev; + int ret; + + dev = cl->dev; + + ret = mei_hbm_cl_connect_req(dev, cl); + cl->status = ret; + if (ret) { + cl->state = MEI_FILE_DISCONNECT_REPLY; + return ret; + } + + list_move_tail(&cb->list, &dev->ctrl_rd_list.list); + cl->timer_count = MEI_CONNECT_TIMEOUT; + return 0; +} + +/** + * mei_cl_irq_connect - send connect request in irq_thread context + * + * @cl: host client + * @cb: callback block + * @cmpl_list: complete list + * + * Return: 0, OK; otherwise, error. + */ +int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb, + struct mei_cl_cb *cmpl_list) +{ + struct mei_device *dev = cl->dev; + u32 msg_slots; + int slots; + int rets; + + msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request)); + slots = mei_hbuf_empty_slots(dev); + + if (mei_cl_is_other_connecting(cl)) + return 0; + + if (slots < msg_slots) + return -EMSGSIZE; + + rets = mei_cl_send_connect(cl, cb); + if (rets) + list_move_tail(&cb->list, &cmpl_list->list); + + return rets; +} + /** * mei_cl_connect - connect host client to the me one * @@ -935,18 +990,14 @@ int mei_cl_connect(struct mei_cl *cl, struct file *file) if (rets) goto out; + cl->state = MEI_FILE_CONNECTING; + list_add_tail(&cb->list, &dev->ctrl_wr_list.list); + /* run hbuf acquire last so we don't have to undo */ if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) { - cl->state = MEI_FILE_CONNECTING; - if (mei_hbm_cl_connect_req(dev, cl)) { - rets = -ENODEV; + rets = mei_cl_send_connect(cl, cb); + if (rets) goto out; - } - cl->timer_count = MEI_CONNECT_TIMEOUT; - list_add_tail(&cb->list, &dev->ctrl_rd_list.list); - } else { - cl->state = MEI_FILE_INITIALIZING; - list_add_tail(&cb->list, &dev->ctrl_wr_list.list); } mutex_unlock(&dev->device_lock); @@ -957,20 +1008,22 @@ int mei_cl_connect(struct mei_cl *cl, struct file *file) mutex_lock(&dev->device_lock); if (!mei_cl_is_connected(cl)) { - /* something went really wrong */ + /* timeout or something went really wrong */ if (!cl->status) cl->status = -EFAULT; - mei_cl_set_disconnected(cl); } rets = cl->status; - out: cl_dbg(dev, cl, "rpm: autosuspend\n"); pm_runtime_mark_last_busy(dev->dev); pm_runtime_put_autosuspend(dev->dev); mei_io_cb_free(cb); + + if (!mei_cl_is_connected(cl)) + mei_cl_set_disconnected(cl); + return rets; } diff --git a/drivers/misc/mei/client.h b/drivers/misc/mei/client.h index 57ce177d5b3a..181aed992399 100644 --- a/drivers/misc/mei/client.h +++ b/drivers/misc/mei/client.h @@ -103,12 +103,13 @@ static inline bool mei_cl_is_connected(struct mei_cl *cl) return cl->state == MEI_FILE_CONNECTED; } -bool mei_cl_is_other_connecting(struct mei_cl *cl); int mei_cl_disconnect(struct mei_cl *cl); void mei_cl_set_disconnected(struct mei_cl *cl); int mei_cl_irq_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb, struct mei_cl_cb *cmpl_list); int mei_cl_connect(struct mei_cl *cl, struct file *file); +int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb, + struct mei_cl_cb *cmpl_list); int mei_cl_read_start(struct mei_cl *cl, size_t length, struct file *fp); int mei_cl_irq_read_msg(struct mei_cl *cl, struct mei_msg_hdr *hdr, struct mei_cl_cb *cmpl_list); diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c index 6fd7ca9b3119..3b74e3b9b294 100644 --- a/drivers/misc/mei/interrupt.c +++ b/drivers/misc/mei/interrupt.c @@ -223,49 +223,6 @@ static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb, return 0; } - -/** - * mei_cl_irq_connect - send connect request in irq_thread context - * - * @cl: client - * @cb: callback block. - * @cmpl_list: complete list. - * - * Return: 0, OK; otherwise, error. - */ -static int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb, - struct mei_cl_cb *cmpl_list) -{ - struct mei_device *dev = cl->dev; - u32 msg_slots; - int slots; - int ret; - - msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request)); - slots = mei_hbuf_empty_slots(dev); - - if (mei_cl_is_other_connecting(cl)) - return 0; - - if (slots < msg_slots) - return -EMSGSIZE; - - cl->state = MEI_FILE_CONNECTING; - - ret = mei_hbm_cl_connect_req(dev, cl); - if (ret) { - cl->status = ret; - cb->buf_idx = 0; - list_del_init(&cb->list); - return ret; - } - - list_move_tail(&cb->list, &dev->ctrl_rd_list.list); - cl->timer_count = MEI_CONNECT_TIMEOUT; - return 0; -} - - /** * mei_irq_read_handler - bottom half read routine after ISR to * handle the read processing.