This is a note to let you know that I've just added the patch titled
xhci: Fix race between ep halt and URB cancellation
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xhci-fix-race-between-ep-halt-and-urb-cancellation.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 526867c3ca0caa2e3e846cb993b0f961c33c2abb Mon Sep 17 00:00:00 2001
From: Florian Wolter <wolly84@xxxxxx>
Date: Wed, 14 Aug 2013 10:33:16 +0200
Subject: xhci: Fix race between ep halt and URB cancellation
From: Florian Wolter <wolly84@xxxxxx>
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@xxxxxx>
Signed-off-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
Cc: Jonghwan Choi <jhbird.choi@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci-ring.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -857,8 +857,12 @@ 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.
Patches currently in stable-queue which might be from wolly84@xxxxxx are
queue-3.4/xhci-fix-race-between-ep-halt-and-urb-cancellation.patch
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