tree 3f23ad213911ab98dd30694109c6c0bcfe17afd7
parent b601fe5688ae285693c64e833003c14acb38378a
author James Harper <james.harper@ejbdigital.com.au> 1402566818 -0300
committer Mauro Carvalho Chehab <m.chehab@samsung.com> 1406385195 -0300

[media] vmalloc_sg: make sure all pages in vmalloc area are really DMA-ready

Patch originally written by Konrad. Rebased on current linux media tree.

Under Xen, vmalloc_32() isn't guaranteed to return pages which are really
under 4G in machine physical addresses (only in virtual pseudo-physical
addresses).  To work around this, implement a vmalloc variant which
allocates each page with dma_alloc_coherent() to guarantee that each
page is suitable for the device in question.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: James Harper <james.harper@ejbdigital.com.au>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>