linux-kernel - [PATCH 4/5 V3] usb: call pm_runtime_put_noidle in pm_runtime_get

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Date:	Fri, 01 Mar 2013 10:57:24 +0800
From:	Li Fei <fei.li@...el.com>
To:	gregkh@...uxfoundation.org, tianyu.lan@...el.com,
	sarah.a.sharp@...ux.intel.com, stern@...land.harvard.edu
Cc:	rjw@...k.pl, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, chuansheng.liu@...el.com,
	fei.li@...el.com
Subject: [PATCH 4/5 V3] usb: call pm_runtime_put_noidle in
 pm_runtime_get_sync failed case


Even in failed case of pm_runtime_get_sync, the usage_count
is incremented. In order to keep the usage_count with correct
value and runtime power management to behave correctly, call
pm_runtime_put(_sync/noidle) in such case.

Signed-off-by Liu Chuansheng <chuansheng.liu@...el.com>
Signed-off-by: Li Fei <fei.li@...el.com>
---
 drivers/usb/core/hub.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 5480352..4a6c055 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -3148,12 +3148,13 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
 
 	if (port_dev->did_runtime_put) {
 		status = pm_runtime_get_sync(&port_dev->dev);
-		port_dev->did_runtime_put = false;
 		if (status < 0) {
 			dev_dbg(&udev->dev, "can't resume usb port, status %d\n",
 					status);
+			pm_runtime_put_noidle(&port_dev->dev);
 			return status;
 		}
+		port_dev->did_runtime_put = false;
 	}
 
 	/* Skip the initial Clear-Suspend step for a remote wakeup */
-- 
1.7.4.1



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