From: Tomas Winkler <tomas.winkler@intel.com>
Date: Thu, 7 Jan 2016 12:46:38 +0000 (+0200)
Subject: mei: fix fasync return value on error
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=ed6dc538e5a36a331b6256d54f435c80f6715460;p=openwrt%2Fstaging%2Fblogic.git

mei: fix fasync return value on error

fasync should return a negative value on error
and not poll mask POLLERR.

Cc: <stable@vger.kernel.org> # 4.3+
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index b2f2486b3d75..677d0362f334 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -657,7 +657,9 @@ out:
  * @file: pointer to file structure
  * @band: band bitmap
  *
- * Return: poll mask
+ * Return: negative on error,
+ *         0 if it did no changes,
+ *         and positive a process was added or deleted
  */
 static int mei_fasync(int fd, struct file *file, int band)
 {
@@ -665,7 +667,7 @@ static int mei_fasync(int fd, struct file *file, int band)
 	struct mei_cl *cl = file->private_data;
 
 	if (!mei_cl_is_connected(cl))
-		return POLLERR;
+		return -ENODEV;
 
 	return fasync_helper(fd, file, band, &cl->ev_async);
 }