From cd705d5ad49bb8894dda2726dcaef8f63ddeba43 Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@alien8.de>
Date: Sun, 21 Oct 2012 18:57:56 +0200
Subject: [PATCH] libata debugging: Warn when unable to find timing descriptor
 based on xfer_mode

ata_timing_find_mode could return NULL which is not checked by all
low-level ATA drivers using it and cause a NULL ptr deref. Warn at least
so that possible issues can get fixed easily.

Signed-off-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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