diff options
| author | Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com> | 2011-03-24 12:20:13 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-04-13 16:24:04 -0700 |
| commit | 806e8f8fcc27e1753947bd9f059ba2316cf8f92a (patch) | |
| tree | 939324f5fa4041bb9d66642e1b6df842d93f4d59 /drivers/usb/gadget/file_storage.c | |
| parent | 088c64f812847b3623b03d167ed329f90f3e38a4 (diff) | |
usb: usb_storage: do not align length of request for CBW to maxp size
Mass-storage and file-storage gadgets align the length to maximum-packet-size
when preparing the request to receive CBW. This is unnecessary and prevents the
controller driver from knowing that a short-packet is expected.
It is incorrect to set short_not_ok when preparing the request to receive CBW.
CBW will be a short-packet so short_not_ok must not be set.
This makes bh->bulk_out_intended_length unnecessary so it is also removed.
Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/gadget/file_storage.c')
| -rw-r--r-- | drivers/usb/gadget/file_storage.c | 28 |
1 files changed, 6 insertions, 22 deletions
diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c index a6eacb59571b..d04e0e6b019d 100644 --- a/drivers/usb/gadget/file_storage.c +++ b/drivers/usb/gadget/file_storage.c @@ -497,19 +497,6 @@ 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; @@ -730,10 +717,9 @@ 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 != bh->bulk_out_intended_length) + if (req->status || req->actual != req->length) DBG(fsg, "%s --> %d, %u/%u\n", __func__, - req->status, req->actual, - bh->bulk_out_intended_length); + req->status, req->actual, req->length); if (req->status == -ECONNRESET) // Request was cancelled usb_ep_fifo_flush(ep); @@ -1349,8 +1335,7 @@ static int do_write(struct fsg_dev *fsg) /* amount is always divisible by 512, hence by * the bulk-out maxpacket size */ - bh->outreq->length = bh->bulk_out_intended_length = - amount; + bh->outreq->length = amount; bh->outreq->short_not_ok = 1; start_transfer(fsg, fsg->bulk_out, bh->outreq, &bh->outreq_busy, &bh->state); @@ -2010,8 +1995,7 @@ 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 = bh->bulk_out_intended_length = - amount; + bh->outreq->length = amount; bh->outreq->short_not_ok = 1; start_transfer(fsg, fsg->bulk_out, bh->outreq, &bh->outreq_busy, &bh->state); @@ -2688,8 +2672,8 @@ static int get_next_command(struct fsg_dev *fsg) } /* Queue a request to read a Bulk-only CBW */ - set_bulk_out_req_length(fsg, bh, USB_BULK_CB_WRAP_LEN); - bh->outreq->short_not_ok = 1; + bh->outreq->length = USB_BULK_CB_WRAP_LEN; + bh->outreq->short_not_ok = 0; start_transfer(fsg, fsg->bulk_out, bh->outreq, &bh->outreq_busy, &bh->state); |