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| author | Florian Wolter <wolly84@web.de> | 2013-08-14 10:33:16 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-05 07:00:39 -0700 |
| commit | 314bb48ec028ae62cec4a1371cdd84b672d5a759 (patch) | |
| tree | 8056b501081a0b9c98d9ed7d2b96f78d12fd2604 | |
| parent | a86384dbc0bf86e10301eb8eaafb9d49c90e3183 (diff) | |
| download | linux-stable-314bb48ec028ae62cec4a1371cdd84b672d5a759.tar.gz linux-stable-314bb48ec028ae62cec4a1371cdd84b672d5a759.tar.bz2 linux-stable-314bb48ec028ae62cec4a1371cdd84b672d5a759.zip | |
xhci: Fix race between ep halt and URB cancellation
commit 526867c3ca0caa2e3e846cb993b0f961c33c2abb upstream.
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>
Cc: Jonghwan Choi <jhbird.choi@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 244a5e241bed..40e39df46f2e 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -882,8 +882,12 @@ 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. |