tree 6114a67bccfe4e81698be4c26daa5089010c30a7
parent f4b2f07b2ed9b469ead87e06fc2fc3d12663a725
author Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 1311353508 -0400
committer Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 1314375016 -0400

xen-swiotlb: Fix wrong panic.

Propagate the baremetal git commit "swiotlb: fix wrong panic"
(fba99fa38b023224680308a482e12a0eca87e4e1) in the Xen-SWIOTLB version.
wherein swiotlb's map_page wrongly calls panic() when it can't find
a buffer fit for device's dma mask.  It should return an error instead.

Devices with an odd dma mask (i.e.  under 4G) like b44 network card hit
this bug (the system crashes):

http://marc.info/?l=linux-kernel&m=129648943830106&w=2

If xen-swiotlb returns an error, b44 driver can use the own bouncing
mechanism.

CC: stable@kernel.org
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>