[3.11.y.z extended stable] Patch "b43legacy: Fix unload oops if firmware is not available" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    b43legacy: Fix unload oops if firmware is not available

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 4b8203099bbc3fd2ae92a45070502bdc1bc2c834 Mon Sep 17 00:00:00 2001
From: Larry Finger <Larry.Finger at lwfinger.net>
Date: Sun, 12 Jan 2014 15:11:39 -0600
Subject: b43legacy: Fix unload oops if firmware is not available

commit 452028665312672c6ba9e16a19248ee00ead9400 upstream.

The asyncronous firmware load uses a completion struct to hold firmware
processing until the user-space routines are up and running. There is.
however, a problem in that the waiter is nevered canceled during teardown.
As a result, unloading the driver when firmware is not available causes an oops.

Signed-off-by: Larry Finger <Larry.Finger at lwfinger.net>
Signed-off-by: John W. Linville <linville at tuxdriver.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/net/wireless/b43legacy/main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/b43legacy/main.c b/drivers/net/wireless/b43legacy/main.c
index 5726688..349c776 100644
--- a/drivers/net/wireless/b43legacy/main.c
+++ b/drivers/net/wireless/b43legacy/main.c
@@ -3919,6 +3919,7 @@ static void b43legacy_remove(struct ssb_device *dev)
 	 * as the ieee80211 unreg will destroy the workqueue. */
 	cancel_work_sync(&wldev->restart_work);
 	cancel_work_sync(&wl->firmware_load);
+	complete(&wldev->fw_load_complete);

 	B43legacy_WARN_ON(!wl);
 	if (!wldev->fw.ucode)
--
1.8.3.2