[PATCH 2.6.31, 2.6.32] Staging: rt2860sta: prevent a panic when disabling when associated

[Darren Salt]

This fixes a panic which is triggered when the hardware "disappears" from
beneath the driver, i.e. when wireless is toggled off via Fn-F2 on various
EeePC models.

Ref. bug report http://bugzilla.kernel.org/show_bug.cgi?id=13390
          panic http://bugzilla.kernel.org/attachment.cgi?id=21928

Signed-off-by: Darren Salt <linux@xxxxxxxxxxxxxxxxxxxxxxxxxxx>

--- a/drivers/staging/rt2860/common/cmm_data_2860.c	2009-09-09 23:13:59.000000000 +0100
+++ b/drivers/staging/rt2860/common/cmm_data_2860.c	2009-10-13 02:07:32.136049782 +0100
@@ -363,6 +363,8 @@ int RtmpPCIMgmtKickOut(
 	ULONG			SwIdx = pAd->MgmtRing.TxCpuIdx;
 
 	pTxD  = (PTXD_STRUC) pAd->MgmtRing.Cell[SwIdx].AllocVa;
+	if (!pTxD)
+		return 0;
 
 	pAd->MgmtRing.Cell[SwIdx].pNdisPacket = pPacket;
 	pAd->MgmtRing.Cell[SwIdx].pNextNdisPacket = NULL;

-- 
| Darren Salt            | linux at youmustbejoking | nr. Ashington, | Doon
| using Debian GNU/Linux | or ds    ,demon,co,uk    | Northumberland | Army
| + Buy local produce. Try to walk or cycle. TRANSPORT CAUSES GLOBAL WARMING.

Please do not shoot the pianist. He is doing his best.
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