[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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