[PATCH v2] can: Fix bug in suspend/resume

Marc Kleine-Budde mkl at pengutronix.de
Fri Nov 14 00:54:37 PST 2014

On 11/14/2014 09:16 AM, Kedareswara rao Appana wrote:
> The drvdata in the suspend/resume is of type struct net_device,
> not the platform device.Enable the clocks in the suspend before
> accessing the registers of the CAN.
> Signed-off-by: Kedareswara rao Appana <appanad at xilinx.com>
> ---
> Changes for v2:
>   - Removed the struct platform_device* from suspend/resume
>     as suggest by Lothar.
>   - The clocks are getting disabled and un prepared at the end of the probe. 
>     In the suspend the driver is doing a register write.In order
>     To do that register write we have to again enable and prepare the clocks.

Please look the at suspend/resume code and count the
clock_enable/disable manually. After a suspend/resume cycle, you have
enabled the clock twice, but disabled it once.

I think you have to abstract the clock handling behind runtime PM. I
haven't done this myself yet, but the strong feeling that this is a
possible solution to your problem. These links might help:


Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
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