diff options
author | Florian Wolter <wolly84@web.de> | 2013-08-14 04:33:16 -0400 |
---|---|---|
committer | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2013-09-23 18:43:31 -0400 |
commit | 526867c3ca0caa2e3e846cb993b0f961c33c2abb (patch) | |
tree | bb633ca571f7d3e0a721c2ffd7c9dd5697f7ab20 /drivers/usb/host/xhci-ring.c | |
parent | 8b3d45705e54075cfb9d4212dbca9ea82c85c4b8 (diff) |
xhci: Fix race between ep halt and URB cancellation
The halted state of a endpoint cannot be cleared over CLEAR_HALT from a
user process, because the stopped_td variable was overwritten in the
handle_stopped_endpoint() function. So the xhci_endpoint_reset() function will
refuse the reset and communication with device can not run over this endpoint.
https://bugzilla.kernel.org/show_bug.cgi?id=60699
Signed-off-by: Florian Wolter <wolly84@web.de>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Diffstat (limited to 'drivers/usb/host/xhci-ring.c')
-rw-r--r-- | drivers/usb/host/xhci-ring.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index dd02402700d5..6bfbd80ec2b9 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c | |||
@@ -869,8 +869,12 @@ remove_finished_td: | |||
869 | /* Otherwise ring the doorbell(s) to restart queued transfers */ | 869 | /* Otherwise ring the doorbell(s) to restart queued transfers */ |
870 | ring_doorbell_for_active_rings(xhci, slot_id, ep_index); | 870 | ring_doorbell_for_active_rings(xhci, slot_id, ep_index); |
871 | } | 871 | } |
872 | ep->stopped_td = NULL; | 872 | |
873 | ep->stopped_trb = NULL; | 873 | /* Clear stopped_td and stopped_trb if endpoint is not halted */ |
874 | if (!(ep->ep_state & EP_HALTED)) { | ||
875 | ep->stopped_td = NULL; | ||
876 | ep->stopped_trb = NULL; | ||
877 | } | ||
874 | 878 | ||
875 | /* | 879 | /* |
876 | * Drop the lock and complete the URBs in the cancelled TD list. | 880 | * Drop the lock and complete the URBs in the cancelled TD list. |