Ming Lei <ming....@canonical.com> writes:

> If suspend callback fails in system sleep context, usb core will
> ignore the failure and let system sleep go ahead further, so
> this patch comments on the case and requires that both
> usbnet_suspend() and subdriver->suspend() MUST return 0 in
> system sleep context.
>
> Cc: Bjørn Mork <bj...@mork.no>
> Signed-off-by: Ming Lei <ming....@canonical.com>
> ---
>  drivers/net/usb/cdc_mbim.c |    5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/drivers/net/usb/cdc_mbim.c b/drivers/net/usb/cdc_mbim.c
> index 248d2dc..406a34d 100644
> --- a/drivers/net/usb/cdc_mbim.c
> +++ b/drivers/net/usb/cdc_mbim.c
> @@ -332,6 +332,11 @@ static int cdc_mbim_suspend(struct usb_interface *intf, 
> pm_message_t message)
>               goto error;
>       }
>  
> +     /*
> +      * Both usbnet_suspend() and subdriver->suspend() MUST return 0
> +      * in system sleep context, otherwise, the resume callback has
> +      * to recover device from previous suspend failure.
> +      */
>       ret = usbnet_suspend(intf, message);
>       if (ret < 0)
>               goto error;

Looks fine.  Thanks

Acked-by: Bjørn Mork <bj...@mork.no>
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