From: Michael Chan <mchan@broadcom.com>
Date: Wed, 27 Jun 2012 15:08:19 +0000 (+0000)
Subject: cnic: Fix occasional NULL pointer dereference during reboot.
X-Git-Tag: v3.6-rc1~125^2~377
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a2028b2376a858cb68a7fcc129f6508f59b45381;p=pandora-kernel.git

cnic: Fix occasional NULL pointer dereference during reboot.

We register with bnx2x before we allocate ctx_tbl structure, so it is
possible for bnx2x to call cnic_ctl before the structure is allocated.
This can sometimes cause NULL pointer dereference of cp->ctx_tbl.  We
fix this by adding simple checking for valid state before proceeding.
The cnic_ctl call is RCU protected so we don't have to deal with race
conditions.

Because of the additional checking, we need to finish the shutdown
before clearing the CNIC_UP flag.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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