ixgbe: fix possible null buffer error
authorJesse Brandeburg <jesse.brandeburg@intel.com>
Tue, 20 Sep 2011 15:13:03 +0000 (15:13 +0000)
committerDavid S. Miller <davem@davemloft.net>
Wed, 21 Sep 2011 06:14:13 +0000 (02:14 -0400)
commitb811ce9104a7f7663ddae4f7795a194a103b8f90
treeb66b4c44e46367c8bf17c1fcca919f16f9aa9d62
parent5c1e688388f629e8d8e88183b5ebc21e209252aa
ixgbe: fix possible null buffer error

It seems that at least one PPC machine would occasionally give a (valid) 0 as
the return value from dma_map, this caused the ixgbe code to not work
correctly.  A fix is pending in the PPC tree to not return 0 from dma map, but
we can also fix the driver to make sure we don't mess up in other arches as
well.

This patch is applicable to all current stable kernels.

Ref: https://bugzilla.redhat.com/show_bug.cgi?id=683611

Reported-by: Neil Horman <nhorman@redhat.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
CC: Alexander Duyck <alexander.h.duyck@intel.com>
CC: stable@kernel.org
Tested-by: Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ixgbe/ixgbe_main.c