[42/46] Staging: rt2860sta: prevent a panic when disabling when associated

[Greg KH]

2.6.31-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Darren Salt <linux@xxxxxxxxxxxxxxxxxxxxxxxxxxx>

commit 0af49167b1e5ba154e90d2c454bf4624ee47df80 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/staging/rt2860/common/cmm_data_2860.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/staging/rt2860/common/cmm_data_2860.c
+++ b/drivers/staging/rt2860/common/cmm_data_2860.c
@@ -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;


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