usb: serial: prevent suspend/resume from racing against probe/remove
authorBjørn Mork <bjorn@mork.no>
Thu, 26 Jul 2012 23:11:42 +0000 (01:11 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 10 Aug 2012 18:51:43 +0000 (11:51 -0700)
commitd5fd650cfc7ffeca4af0da939293c8e7a5aa7c36
tree1f005c3c25a7d75d2cf4abc01f566efa23f9425a
parenta1028f0abfb321e0f87c10ac0cce8508097c2b42
usb: serial: prevent suspend/resume from racing against probe/remove

Some usb-serial drivers may access port data in their suspend/
resume functions. Such drivers must always verify the validity
of the data as both suspend and resume can be called both before
usb_serial_device_probe and after usb_serial_device_remove.

But the port data may be invalidated during port_probe and
port_remove. This patch prevents the race against suspend and
resume by disabling suspend while port_probe or port_remove is
running.

Suggested-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/serial/bus.c