Re: [PATCH v2] can: mcp251x: Fix resume from sleep before interface was brought up

[Marc Kleine-Budde]

On 05.05.2021 09:14:15, Frieder Schrempf wrote:
> From: Frieder Schrempf <frieder.schrempf@xxxxxxxxxx>
> 
> 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@xxxxxxxxxxxxxxx
> Signed-off-by: Frieder Schrempf <frieder.schrempf@xxxxxxxxxx>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> ---
> Changes in v2:
>   * Remove the out_clean label in mcp251x_open()
>   * Add Andy's R-b tag
>   * Add 'From' tag
> 
> Hi Marc, I'm sending a v2 mainly because I noticed that v1 is missing
> the 'From' tag and as my company's mailserver always sends my name
> reversed this causes incorrect author information in git. So if possible
> you could fix this up. If this is too much work, just leave it as is.
> Thanks!

Done.

I've also squashed this fixup:

| --- a/drivers/net/can/spi/mcp251x.c
| +++ b/drivers/net/can/spi/mcp251x.c
| @@ -1224,13 +1224,13 @@ static int mcp251x_open(struct net_device *net)
|  
|         ret = mcp251x_hw_wake(spi);
|         if (ret)
| -               goto out_free_wq;
| +               goto out_free_irq;
|         ret = mcp251x_setup(net, spi);
|         if (ret)
| -               goto out_free_wq;
| +               goto out_free_irq;
|         ret = mcp251x_set_normal_mode(spi);
|         if (ret)
| -               goto out_free_wq;
| +               goto out_free_irq;
|  
|         can_led_event(net, CAN_LED_EVENT_OPEN);
|  
| @@ -1239,8 +1239,7 @@ static int mcp251x_open(struct net_device *net)
|  
|         return 0;
|  
| -out_free_wq:
| -       destroy_workqueue(priv->wq);
| +out_free_irq:
|         free_irq(spi->irq, priv);
|         mcp251x_hw_sleep(spi);
|  out_close:

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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