[PATCH] USB: g_file_storage: Set short_not_ok for bulk-out transfers

I'm told that some UDC hardware may work better if it knows that
receiving a short packet should always cause an error.  Accordingly,
this patch (as663) sets the short_not_ok flag for bulk-out transfers in
g_file_storage.  Oddly enough, there are no circumstances where that
driver can legally receive a shorter-than-expected bulk-out packet.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
index cf3be299e35..eb2821542b7 100644
--- a/drivers/usb/gadget/file_storage.c
+++ b/drivers/usb/gadget/file_storage.c
@@ -1795,6 +1795,7 @@ static int do_write(struct fsg_dev *fsg)
                          * the bulk-out maxpacket size */
                         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);
                         fsg->next_buffhd_to_fill = bh->next;
@@ -2398,6 +2399,7 @@ static int throw_away_data(struct fsg_dev *fsg)
                          * the bulk-out maxpacket size */
                         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);
                         fsg->next_buffhd_to_fill = bh->next;
@@ -3029,6 +3031,7 @@ 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;
                 start_transfer(fsg, fsg->bulk_out, bh->outreq,
                                 &bh->outreq_busy, &bh->state);