linux-kernel - Re: [PATCH] USB: cdc-acm: fix double usb_autopm_put_interface() in acm_port

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Date:	Sat, 12 Apr 2014 20:39:00 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Alexey Khoroshilov <khoroshilov@...ras.ru>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	ldv-project@...uxtesting.org
Subject: Re: [PATCH] USB: cdc-acm: fix double usb_autopm_put_interface() in
 acm_port_activate()

On Sat, 2014-04-12 at 02:10 +0400, Alexey Khoroshilov wrote:
> 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).

Nice catch.

> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
Acked-by: Oliver Neukum <oliver@...kum.org>


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