linux-kernel - [char-misc-next] mei: check whether hw start has succeeded

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Date:	Sun, 23 Jun 2013 22:49:04 +0300
From:	Tomas Winkler <tomas.winkler@...el.com>
To:	gregkh@...uxfoundation.org
Cc:	arnd@...db.de, linux-kernel@...r.kernel.org,
	Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next] mei: check whether hw start has succeeded

hw start may fail therefore the reset flow has
to check for the return value

Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
 drivers/misc/mei/init.c    | 7 ++++++-
 drivers/misc/mei/mei_dev.h | 4 ++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index 1525388..6fc573c 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -181,7 +181,12 @@ void mei_reset(struct mei_device *dev, int interrupts_enabled)
 		return;
 	}
 
-	mei_hw_start(dev);
+	ret = mei_hw_start(dev);
+	if (ret) {
+		dev_err(&dev->pdev->dev, "hw_start failed disabling the device\n");
+		dev->dev_state = MEI_DEV_DISABLED;
+		return;
+	}
 
 	dev_dbg(&dev->pdev->dev, "link is established start sending messages.\n");
 	/* link is established * start sending messages.  */
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 1aa4997..7b918b2 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -544,9 +544,9 @@ static inline int mei_hw_reset(struct mei_device *dev, bool enable)
 	return dev->ops->hw_reset(dev, enable);
 }
 
-static inline void mei_hw_start(struct mei_device *dev)
+static inline int mei_hw_start(struct mei_device *dev)
 {
-	dev->ops->hw_start(dev);
+	return dev->ops->hw_start(dev);
 }
 
 static inline void mei_clear_interrupts(struct mei_device *dev)
-- 
1.8.1.2

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