media: vb2: Fix videobuf2 to map correct area

[ 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.

Change-Id: Ic03697b0f12932995d2f0602b05394f72a1464df
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>

diff --git a/drivers/media/v4l2-core/videobuf2-vmalloc.c b/drivers/media/v4l2-core/videobuf2-vmalloc.c
index 3a7c80cd1a176d8e7e9eaffff343f56fe48160b6..359fb9804d160426ab037133e2102b979833ecff 100644 (file)
--- a/drivers/media/v4l2-core/videobuf2-vmalloc.c
+++ b/drivers/media/v4l2-core/videobuf2-vmalloc.c
@@ -106,7 +106,7 @@ static void *vb2_vmalloc_get_userptr(struct device *dev, unsigned long vaddr,
                        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);