[PATCH] [BUGFIX] media: vb2: Fix videobuf2 to map correct area

[Masami Hiramatsu]

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 page address + 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 <mhira...@kernel.org>
Reported-by: Takao Orito <orito.ta...@socionext.com>
---
 drivers/media/v4l2-core/videobuf2-vmalloc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/videobuf2-vmalloc.c 
b/drivers/media/v4l2-core/videobuf2-vmalloc.c
index 3a7c80cd1a17..896f2f378b40 100644
--- 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]) + offset, size);
        } else {
                buf->vaddr = vm_map_ram(frame_vector_pages(vec), n_pages, -1,
                                        PAGE_KERNEL);