From: Bhanu Prakash Gollapudi <bprakash@broadcom.com>
Date: Fri, 5 Aug 2011 00:38:46 +0000 (-0700)
Subject: [SCSI] bnx2fc: Fix NULL pointer deref during arm_cq.
X-Git-Tag: v3.2-rc1~125^2~186
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b338c785c5c945383046ff39092e3021ea5b1d95;p=pandora-kernel.git

[SCSI] bnx2fc: Fix NULL pointer deref during arm_cq.

There exists a race condition between CQ doorbell unmap and IO completion path
that arms the CQ which causes a NULL dereference. Protect the ctx_base with
cq_lock to avoid this. Also, wait for the CQ doorbell to be successfully mapped
before arming the CQ.

Also, do not count uncolicited CQ completions for free_sqes.

Signed-off-by: Bhanu Prakash Gollapudi <bprakash@broadcom.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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