linux-kernel - [char-misc-next 13/27] mei: amthif: interrupt reader on link reset

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Message-Id: <1454880943-12653-14-git-send-email-tomas.winkler@intel.com>
Date:	Sun,  7 Feb 2016 23:35:29 +0200
From:	Tomas Winkler <tomas.winkler@...el.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Alexander Usyskin <alexander.usyskin@...el.com>,
	linux-kernel@...r.kernel.org,
	Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next 13/27] mei: amthif: interrupt reader on link reset

From: Alexander Usyskin <alexander.usyskin@...el.com>

In case of link reset all waiting readers should be interrupted.

Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
 drivers/misc/mei/amthif.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c
index b98eac389782..ca2efc3602df 100644
--- a/drivers/misc/mei/amthif.c
+++ b/drivers/misc/mei/amthif.c
@@ -122,7 +122,8 @@ int mei_amthif_read(struct mei_device *dev, struct file *file,
 		mutex_unlock(&dev->device_lock);
 
 		wait_ret = wait_event_interruptible(cl->rx_wait,
-					!list_empty(&cl->rd_completed));
+					!list_empty(&cl->rd_completed) ||
+					!mei_cl_is_connected(cl));
 
 		/* Locking again the Mutex */
 		mutex_lock(&dev->device_lock);
@@ -130,6 +131,11 @@ int mei_amthif_read(struct mei_device *dev, struct file *file,
 		if (wait_ret)
 			return -ERESTARTSYS;
 
+		if (!mei_cl_is_connected(cl)) {
+			rets = -EBUSY;
+			goto out;
+		}
+
 		cb = mei_cl_read_cb(cl, file);
 	}
 
-- 
2.4.3