xhci: Fix oops happening after address device timeout

commit 284d20552461466b04d6bfeafeb1c47a8891b591 upstream.

When a command times out, the command ring is first aborted,
and then stopped. If the command ring is empty when it is stopped
the stop event will point to next command which is not yet set.
xHCI tries to handle this next event often causing an oops.

Don't handle command completion events on stopped cmd ring if ring is
empty.

This patch should be backported to kernels as old as 3.7, that contain
the commit b92cc66c047ff7cf587b318fe377061a353c120f "xHCI: add aborting
command ring function"

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Reported-by: Giovanni <giovanni.nervi@yahoo.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 8192e32be87c4015997081c8c88ca0730c123e84..21f1f13ea2626139a96f106ad490d9bc6ca74f3f 100644 (file)
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -1400,6 +1400,12 @@ static void handle_cmd_completion(struct xhci_hcd *xhci,
                        inc_deq(xhci, xhci->cmd_ring);
                        return;
                }
+               /* There is no command to handle if we get a stop event when the
+                * command ring is empty, event->cmd_trb points to the next
+                * unset command
+                */
+               if (xhci->cmd_ring->dequeue == xhci->cmd_ring->enqueue)
+                       return;
        }
 
        switch (le32_to_cpu(xhci->cmd_ring->dequeue->generic.field[3])