USB: usb_wwan: fix write and suspend race

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commit 170fad9e22 upstream.

Fix race between write() and suspend() which could lead to writes being
dropped (or I/O while suspended) if the device is runtime suspended
while a write request is being processed.

Specifically, suspend() releases the susp_lock after determining the
device is idle but before setting the suspended flag, thus leaving a
window where a concurrent write() can submit an urb.

Fixes: 383cedc3bb ("USB: serial: full autosuspend support for the
option driver")

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Johan Hovold 2014-05-26 19:23:15 +02:00 • committed by Greg Kroah-Hartman

parent 442d460ee5

commit 47909efe22

1 changed files with 5 additions and 8 deletions

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drivers/usb/serial/usb_wwan.c

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