netdev - [PATCH v3 7/7] usbnet: smsc75xx: don't recover device if suspend fails in system sleep

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Message-Id: <1363320539-23012-8-git-send-email-ming.lei@canonical.com>
Date:	Fri, 15 Mar 2013 12:08:59 +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>,
	Steve Glendinning <steve.glendinning@...well.net>
Subject: [PATCH v3 7/7] usbnet: smsc75xx: don't recover device if suspend fails in system sleep

If suspend callback fails in system sleep context, usb core will
ignore the failure and let system sleep go ahead further, so
this patch doesn't recover device under this situation.

Also add comments on this case.

Acked-by: David S. Miller <davem@...emloft.net>
Cc: Steve Glendinning <steve.glendinning@...well.net>
Signed-off-by: Ming Lei <ming.lei@...onical.com>
---
 drivers/net/usb/smsc75xx.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c
index 9abe517..21b607a 100644
--- a/drivers/net/usb/smsc75xx.c
+++ b/drivers/net/usb/smsc75xx.c
@@ -2011,7 +2011,11 @@ static int smsc75xx_suspend(struct usb_interface *intf, pm_message_t message)
 	ret = smsc75xx_enter_suspend0(dev);
 
 done:
-	if (ret)
+	/*
+	 * TODO: resume() might need to handle the suspend failure
+	 * in system sleep
+	 */
+	if (ret && PMSG_IS_AUTO(message))
 		usbnet_resume(intf);
 	return ret;
 }
-- 
1.7.9.5

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