USB: EHCI: unlink QHs even after the controller has stopped
authorAlan Stern <stern@rowland.harvard.edu>
Wed, 17 Sep 2014 15:23:54 +0000 (11:23 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 19 Sep 2014 21:59:17 +0000 (14:59 -0700)
commit7312b5ddd47fee2356baa78c5516ef8e04eed452
treeacee82032dd9596d976597d8f23e2bbf07d50c95
parent2d23d8ba31900f628b070891139c59e78f1e19b6
USB: EHCI: unlink QHs even after the controller has stopped

Old code in ehci-hcd tries to expedite disabling endpoints after the
controller has stopped, by destroying the endpoint's associated QH
without first unlinking the QH.  This was necessary back when the
driver wasn't so careful about keeping track of the controller's
state.

But now we are careful about it, and the driver knows that when the
controller isn't running, no unlinking delay is needed.  Furthermore,
skipping the unlink step will trigger a BUG() in qh_destroy() when the
preceding QH is released, because the link pointer will be non-NULL.

Removing the lines that skip the unlinking step and go directly to
QH_STATE_IDLE fixes the problem.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: Joe Lawrence <joe.lawrence@stratus.com>
Tested-by: Joe Lawrence <joe.lawrence@stratus.com>
CC: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/host/ehci-hcd.c