4.9-stable review patch. If anyone has any objections, please let me know.
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From: Masami Hiramatsu mhiramat@kernel.org
[ Upstream commit d13a0139d7874a0577b5955d6eed895517d23b72 ]
Fixes vb2_vmalloc_get_userptr() to ioremap correct area. Since the current code does ioremap the page address, if the offset > 0, it does not do ioremap the last page and results in kernel panic.
This fixes to pass the size + offset to ioremap so that ioremap can map correct area. Also, this uses __pfn_to_phys() to get the physical address of given PFN.
Signed-off-by: Masami Hiramatsu mhiramat@kernel.org Reported-by: Takao Orito orito.takao@socionext.com Reported-by: Fumihiro ATSUMI atsumi@infinitegra.co.jp Reviewed-by: Marek Szyprowski m.szyprowski@samsung.com Signed-off-by: Hans Verkuil hans.verkuil@cisco.com Signed-off-by: Mauro Carvalho Chehab mchehab@s-opensource.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/media/v4l2-core/videobuf2-vmalloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/media/v4l2-core/videobuf2-vmalloc.c +++ b/drivers/media/v4l2-core/videobuf2-vmalloc.c @@ -104,7 +104,7 @@ static void *vb2_vmalloc_get_userptr(str if (nums[i-1] + 1 != nums[i]) goto fail_map; buf->vaddr = (__force void *) - ioremap_nocache(nums[0] << PAGE_SHIFT, size); + ioremap_nocache(__pfn_to_phys(nums[0]), size + offset); } else { buf->vaddr = vm_map_ram(frame_vector_pages(vec), n_pages, -1, PAGE_KERNEL);