From d15e2a92c4c263fd44a0b41e637a032bd618e6c9 Mon Sep 17 00:00:00 2001
From: Eddie Wai <eddie.wai@broadcom.com>
Date: Tue, 31 Dec 2013 23:18:34 -0800
Subject: [PATCH] cnic: Add a signature to indicate valid doorbell offset.

The buffer that is used to pass doorbell offset to the userspace UIO
driver may contain nonzero value in older versions of bnx2x driver.
Userspace cannot easily tell whether it contains a valid doorbell
offset or not.  With the added signature, userspace will only use
the doorbell offset if the signature is present.

Update version to 2.5.19.

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