usb: r8a66597-hcd: select a different endpoint on timeout

commit 1f873d857b6c2fefb4dada952674aa01bcfb92bd upstream.

If multiple endpoints on a single device have pending IN URBs and one
endpoint times out due to NAKs (perfectly legal), select a different
endpoint URB to try.
The existing code only checked to see another device address has pending
URBs and ignores other IN endpoints on the current device address. This
leads to endpoints never getting serviced if one endpoint is using NAK as
a flow control method.

Fixes: 5d3043586db4 ("usb: r8a66597-hcd: host controller driver for R8A6659")
Signed-off-by: Chris Brandt <chris.brandt@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/usb/host/r8a66597-hcd.c b/drivers/usb/host/r8a66597-hcd.c
index 42645d8e63dd4ae8a8d78eba8e0df88306e98db0..fa5482c2ebab2fc5e55bf67f5847dcfcd6a875b0 100644 (file)
--- a/drivers/usb/host/r8a66597-hcd.c
+++ b/drivers/usb/host/r8a66597-hcd.c
@@ -1790,6 +1790,7 @@ static void r8a66597_td_timer(unsigned long _r8a66597)
                pipe = td->pipe;
                pipe_stop(r8a66597, pipe);
 
+               /* Select a different address or endpoint */
                new_td = td;
                do {
                        list_move_tail(&new_td->queue,
@@ -1799,7 +1800,8 @@ static void r8a66597_td_timer(unsigned long _r8a66597)
                                new_td = td;
                                break;
                        }
-               } while (td != new_td && td->address == new_td->address);
+               } while (td != new_td && td->address == new_td->address &&
+                       td->pipe->info.epnum == new_td->pipe->info.epnum);
 
                start_transfer(r8a66597, new_td);