From: Bjørn Mork <bjorn@mork.no>
Date: Thu, 26 Jul 2012 23:11:42 +0000 (+0200)
Subject: usb: serial: prevent suspend/resume from racing against probe/remove
X-Git-Tag: v3.6-rc3~41^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d5fd650cfc7ffeca4af0da939293c8e7a5aa7c36;p=pandora-kernel.git

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>
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