From: Roland Dreier <roland@purestorage.com>
Date: Tue, 6 Dec 2011 18:47:37 +0000 (-0800)
Subject: IB/mlx4: Fix shutdown crash accessing a non-existent bitmap
X-Git-Tag: v3.2-rc7~39^2^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4af3ce0de0c12e5c17811eaefad36ab8e146c0fd;p=pandora-kernel.git

IB/mlx4: Fix shutdown crash accessing a non-existent bitmap

Commit cfcde11c3d7a ("IB/mlx4: Use flow counters on IBoE ports") added
code that sets elements of counters[] to -1 if no counter is allocated,
but then goes ahead and passes every entry to mlx4_counter_free() on
shutdown.  This is a bad idea, especially if MLX4_DEV_CAP_FLAG_COUNTERS
isn't set so there isn't even an underlying bitmap to free from.

Tested-by: Sean Hefty <sean.hefty@intel.com>
Cc: <stable@kernel.org>
Signed-off-by: Roland Dreier <roland@purestorage.com>
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