USB: cdc-acm: fix write and suspend race

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commit 5a345c20c1 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 write_lock after determining the
device is idle but before incrementing the susp_count, thus leaving a
window where a concurrent write() can submit an urb.

Fixes: 11ea859d64 ("USB: additional power savings for cdc-acm devices
that support remote wakeup")

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 19:23:36 +02:00 • committed by Greg Kroah-Hartman

parent 50076fbbb2

commit 7408a52271

1 changed files with 6 additions and 9 deletions

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drivers/usb/class/cdc-acm.c

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