linux-kernel - Re: [PATCH] can: mcp251x: Fix resume from sleep before interface was brought up

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Message-ID: <20210504184854.urgotqioxtjwbqqs@pengutronix.de>
Date:   Tue, 4 May 2021 20:48:54 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Schrempf Frieder <frieder.schrempf@...tron.de>
Cc:     Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Timo Schlüßler <schluessler@...use.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Tim Harvey <tharvey@...eworks.com>, stable@...r.kernel.org,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] can: mcp251x: Fix resume from sleep before interface was
 brought up

On 04.05.2021 18:01:48, Schrempf Frieder wrote:
> Since 8ce8c0abcba3 the driver queues work via priv->restart_work when
> resuming after suspend, even when the interface was not previously
> enabled. This causes a null dereference error as the workqueue is
> only allocated and initialized in mcp251x_open().
> 
> To fix this we move the workqueue init to mcp251x_can_probe() as
> there is no reason to do it later and repeat it whenever
> mcp251x_open() is called.
> 
> Fixes: 8ce8c0abcba3 ("can: mcp251x: only reset hardware as required")
> Cc: stable@...r.kernel.org
> Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>

Added to linux-can/testing.

Thanks,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
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