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

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Message-Id: <1362672924-22975-6-git-send-email-ming.lei@canonical.com>
Date:	Fri,  8 Mar 2013 00:15:22 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Kosina <jkosina@...e.cz>
Cc:	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,
	Ming Lei <ming.lei@...onical.com>,
	Bjørn Mork <bjorn@...k.no>
Subject: [PATCH v2 5/7] usbnet: qmi_wwan: comments on suspend failure

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;
-- 
1.7.9.5

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