netdev - Re: [PATCH v2 5/7] usbnet: qmi_wwan: comments on suspend failure

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Message-ID: <871ubrjd5a.fsf@nemi.mork.no>
Date:	Thu, 07 Mar 2013 19:08:49 +0100
From:	Bjørn Mork <bjorn@...k.no>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Alan Stern <stern@...land.harvard.edu>,
	Oliver Neukum <oneukum@...e.de>, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH v2 5/7] usbnet: qmi_wwan: comments on suspend failure

Ming Lei <ming.lei@...onical.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 <bjorn@...k.no>
> Signed-off-by: Ming Lei <ming.lei@...onical.com>
> ---
>  drivers/net/usb/qmi_wwan.c |    5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
> index efb5c7c..8a60bdd 100644
> --- a/drivers/net/usb/qmi_wwan.c
> +++ b/drivers/net/usb/qmi_wwan.c
> @@ -288,6 +288,11 @@ static int qmi_wwan_suspend(struct usb_interface *intf, pm_message_t message)
>  	struct qmi_wwan_state *info = (void *)&dev->data;
>  	int ret;
>  
> +	/*
> +	 * 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 err;

Acked-by: Bjørn Mork <bjorn@...k.no>
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