Patch "mei: fix fasync return value on error" has been added to the 4.4-stable tree

Patch "mei: fix fasync return value on error" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    mei: fix fasync return value on error

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mei-fix-fasync-return-value-on-error.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From ed6dc538e5a36a331b6256d54f435c80f6715460 Mon Sep 17 00:00:00 2001
From: Tomas Winkler <tomas.winkler@intel.com>
Date: Thu, 7 Jan 2016 14:46:38 +0200
Subject: mei: fix fasync return value on error

From: Tomas Winkler <tomas.winkler@intel.com>

commit ed6dc538e5a36a331b6256d54f435c80f6715460 upstream.

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

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>

---
 drivers/misc/mei/main.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- 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 fil
 	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);
 }


Patches currently in stable-queue which might be from tomas.winkler@intel.com are

queue-4.4/mei-validate-request-value-in-client-notify-request-ioctl.patch
queue-4.4/mei-fix-fasync-return-value-on-error.patch