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

[Kamal Mostafa]

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-3.8.y-queue branch of the 3.8.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-3.8.y-queue

This patch is scheduled to be released in version 3.8.13.18.

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

For more information about the 3.8.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From ab39ed7f9ea6a3e7c705784f960a8f96b669d14f 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: Kamal Mostafa <kamal 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 8c3f70e..ded7f6c 100644
--- a/drivers/net/wireless/b43legacy/main.c
+++ b/drivers/net/wireless/b43legacy/main.c
@@ -3918,6 +3918,7 @@ 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