netdev - [PATCH 3/3 V2] b43legacy: Fix unload oops if firmware is not available

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Message-Id: <1389561099-17181-4-git-send-email-Larry.Finger@lwfinger.net>
Date:	Sun, 12 Jan 2014 15:11:39 -0600
From:	Larry Finger <Larry.Finger@...inger.net>
To:	linville@...driver.com
Cc:	linux-wireless@...r.kernel.org,
	Larry Finger <Larry.Finger@...inger.net>,
	netdev@...r.kernel.org, Stable <stable@...r.kernel.org>
Subject: [PATCH 3/3 V2] b43legacy: Fix unload oops if firmware is not available

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@...inger.net>
Cc: Stable <stable@...r.kernel.org>
---
V2 - Addresses the comments of Ben Hutchings and removes the race condition.

 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)
-- 
1.8.4

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