diff options
| author | Florian Wolter <wolly84@web.de> | 2013-08-14 10:33:16 +0200 |
|---|---|---|
| committer | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2013-09-23 15:43:31 -0700 |
| commit | 526867c3ca0caa2e3e846cb993b0f961c33c2abb (patch) | |
| tree | bb633ca571f7d3e0a721c2ffd7c9dd5697f7ab20 /drivers/usb | |
| parent | 8b3d45705e54075cfb9d4212dbca9ea82c85c4b8 (diff) | |
| download | linux-526867c3ca0caa2e3e846cb993b0f961c33c2abb.tar.gz | |
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')
| -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: /* Otherwise ring the doorbell(s) to restart queued transfers */ ring_doorbell_for_active_rings(xhci, slot_id, ep_index); } - ep->stopped_td = NULL; - ep->stopped_trb = NULL; + + /* Clear stopped_td and stopped_trb if endpoint is not halted */ + if (!(ep->ep_state & EP_HALTED)) { + ep->stopped_td = NULL; + ep->stopped_trb = NULL; + } /* * Drop the lock and complete the URBs in the cancelled TD list. |