From: Alexey Khoroshilov <khoroshilov@ispras.ru>
Date: Fri, 11 Apr 2014 22:10:45 +0000 (+0400)
Subject: USB: cdc-acm: fix double usb_autopm_put_interface() in acm_port_activate()
X-Git-Tag: omap-for-v3.16/soc-signed~47^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=070c0b17f6a1ba39dff9be112218127e7e8fd456;p=pandora-kernel.git

USB: cdc-acm: fix double usb_autopm_put_interface() in acm_port_activate()

If acm_submit_read_urbs() fails in acm_port_activate(), error handling
code calls usb_autopm_put_interface() while it is already called
before acm_submit_read_urbs(). The patch reorganizes error handling code
to avoid double decrement of USB interface's PM-usage counter.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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