From 98346f7db014614a4814eb60639f651f8bbc591d Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Thu, 14 Apr 2011 13:42:46 -0700 Subject: [PATCH] Revert "usb: usb_storage: do not align length of request for CBW to maxp size" This reverts commit 806e8f8fcc27e1753947bd9f059ba2316cf8f92a. To quote Alan Stern: The necessity for this patch has been under discussion. It turns out the UDC that Mian has been working on and Felipe's UDC have contradictory requirements. Mian's UDC driver wants a bulk-OUT transfer length to be shorter than the maxpacket size if a short packet is expected, whereas Felipe's UDC hardware always needs bulk-OUT transfer lengths to be evenly divisible by the maxpacket size. Mian has agreed to go back over the driver to resolve this conflict. This means we probably will not want this patch after all. (In fact, we may ultimately decide to change the gadget framework to require that bulk-OUT transfer lengths _always_ be divisible by the maxpacket size -- only the g_file_storage and g_mass_storage gadgets would need to be changed.) Cc: Mian Yousaf Kaukab Cc: Michal Nazarewicz Cc: Alan Stern Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/f_mass_storage.c | 24 ++++++++++++++++++++---- drivers/usb/gadget/file_storage.c | 28 ++++++++++++++++++++++------ drivers/usb/gadget/storage_common.c | 7 +++++++ 3 files changed, 49 insertions(+), 10 deletions(-) diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c index 7d95a2cf58a3..01ae27b60d4c 100644 --- a/drivers/usb/gadget/f_mass_storage.c +++ b/drivers/usb/gadget/f_mass_storage.c @@ -474,6 +474,20 @@ static int exception_in_progress(struct fsg_common *common) return common->state > FSG_STATE_IDLE; } +/* Make bulk-out requests be divisible by the maxpacket size */ +static void set_bulk_out_req_length(struct fsg_common *common, + struct fsg_buffhd *bh, unsigned int length) +{ + unsigned int rem; + + bh->bulk_out_intended_length = length; + rem = length % common->bulk_out_maxpacket; + if (rem > 0) + length += common->bulk_out_maxpacket - rem; + bh->outreq->length = length; +} + + /*-------------------------------------------------------------------------*/ static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep) @@ -572,9 +586,9 @@ static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req) struct fsg_buffhd *bh = req->context; dump_msg(common, "bulk-out", req->buf, req->actual); - if (req->status || req->actual != req->length) + if (req->status || req->actual != bh->bulk_out_intended_length) DBG(common, "%s --> %d, %u/%u\n", __func__, - req->status, req->actual, req->length); + req->status, req->actual, bh->bulk_out_intended_length); if (req->status == -ECONNRESET) /* Request was cancelled */ usb_ep_fifo_flush(ep); @@ -966,6 +980,7 @@ static int do_write(struct fsg_common *common) * the bulk-out maxpacket size */ bh->outreq->length = amount; + bh->bulk_out_intended_length = amount; bh->outreq->short_not_ok = 1; if (!start_out_transfer(common, bh)) /* Dunno what to do if common->fsg is NULL */ @@ -1611,6 +1626,7 @@ static int throw_away_data(struct fsg_common *common) * the bulk-out maxpacket size. */ bh->outreq->length = amount; + bh->bulk_out_intended_length = amount; bh->outreq->short_not_ok = 1; if (!start_out_transfer(common, bh)) /* Dunno what to do if common->fsg is NULL */ @@ -2279,8 +2295,8 @@ static int get_next_command(struct fsg_common *common) } /* Queue a request to read a Bulk-only CBW */ - bh->outreq->length = USB_BULK_CB_WRAP_LEN; - bh->outreq->short_not_ok = 0; + set_bulk_out_req_length(common, bh, USB_BULK_CB_WRAP_LEN); + bh->outreq->short_not_ok = 1; if (!start_out_transfer(common, bh)) /* Don't know what to do if common->fsg is NULL */ return -EIO; diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c index aebfb81f3ba4..fcfc77c7ad70 100644 --- a/drivers/usb/gadget/file_storage.c +++ b/drivers/usb/gadget/file_storage.c @@ -497,6 +497,19 @@ static int exception_in_progress(struct fsg_dev *fsg) return (fsg->state > FSG_STATE_IDLE); } +/* Make bulk-out requests be divisible by the maxpacket size */ +static void set_bulk_out_req_length(struct fsg_dev *fsg, + struct fsg_buffhd *bh, unsigned int length) +{ + unsigned int rem; + + bh->bulk_out_intended_length = length; + rem = length % fsg->bulk_out_maxpacket; + if (rem > 0) + length += fsg->bulk_out_maxpacket - rem; + bh->outreq->length = length; +} + static struct fsg_dev *the_fsg; static struct usb_gadget_driver fsg_driver; @@ -717,9 +730,10 @@ static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req) struct fsg_buffhd *bh = req->context; dump_msg(fsg, "bulk-out", req->buf, req->actual); - if (req->status || req->actual != req->length) + if (req->status || req->actual != bh->bulk_out_intended_length) DBG(fsg, "%s --> %d, %u/%u\n", __func__, - req->status, req->actual, req->length); + req->status, req->actual, + bh->bulk_out_intended_length); if (req->status == -ECONNRESET) // Request was cancelled usb_ep_fifo_flush(ep); @@ -1335,7 +1349,8 @@ static int do_write(struct fsg_dev *fsg) /* amount is always divisible by 512, hence by * the bulk-out maxpacket size */ - bh->outreq->length = amount; + bh->outreq->length = bh->bulk_out_intended_length = + amount; bh->outreq->short_not_ok = 1; start_transfer(fsg, fsg->bulk_out, bh->outreq, &bh->outreq_busy, &bh->state); @@ -1964,7 +1979,8 @@ static int throw_away_data(struct fsg_dev *fsg) /* amount is always divisible by 512, hence by * the bulk-out maxpacket size */ - bh->outreq->length = amount; + bh->outreq->length = bh->bulk_out_intended_length = + amount; bh->outreq->short_not_ok = 1; start_transfer(fsg, fsg->bulk_out, bh->outreq, &bh->outreq_busy, &bh->state); @@ -2643,8 +2659,8 @@ static int get_next_command(struct fsg_dev *fsg) } /* Queue a request to read a Bulk-only CBW */ - bh->outreq->length = USB_BULK_CB_WRAP_LEN; - bh->outreq->short_not_ok = 0; + set_bulk_out_req_length(fsg, bh, USB_BULK_CB_WRAP_LEN); + bh->outreq->short_not_ok = 1; start_transfer(fsg, fsg->bulk_out, bh->outreq, &bh->outreq_busy, &bh->state); diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c index 86fcebd89abe..109635a84888 100644 --- a/drivers/usb/gadget/storage_common.c +++ b/drivers/usb/gadget/storage_common.c @@ -286,6 +286,13 @@ struct fsg_buffhd { enum fsg_buffer_state state; struct fsg_buffhd *next; + /* + * The NetChip 2280 is faster, and handles some protocol faults + * better, if we don't submit any short bulk-out read requests. + * So we will record the intended request length here. + */ + unsigned int bulk_out_intended_length; + struct usb_request *inreq; int inreq_busy; struct usb_request *outreq; -- 2.20.1