linux-kernel - [ 06/11] b43: Fix oops on unload when firmware not found

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Date:	Fri,  2 Nov 2012 10:06:41 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Larry Finger <Larry.Finger@...inger.net>,
	Markus Kanet <dvmailing@....eu>,
	"John W. Linville" <linville@...driver.com>
Subject: [ 06/11] b43: Fix oops on unload when firmware not found

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Larry Finger <Larry.Finger@...inger.net>

commit f89ff6441df06abc2d95f3ef67525923032d6283 upstream.

When b43 fails to find firmware when loaded, a subsequent unload will
oops due to calling ieee80211_unregister_hw() when the corresponding
register call was never made.

Commit 2d838bb608e2d1f6cb4280e76748cb812dc822e7 fixed the same problem
for b43legacy.

Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
Tested-by: Markus Kanet <dvmailing@....eu>
Cc: Markus Kanet <dvmailing@....eu>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/b43/main.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -5430,6 +5430,8 @@ static void b43_ssb_remove(struct ssb_de
 	cancel_work_sync(&wldev->restart_work);

 	B43_WARN_ON(!wl);
+	if (!wldev->fw.ucode.data)
+		return;			/* NULL if firmware never loaded */
 	if (wl->current_dev == wldev) {
 		/* Restore the queues count before unregistering, because firmware detect
 		 * might have modified it. Restoring is important, so the networking

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