media: vb2: unify calling of set_page_dirty_lock

Currently videobuf2-dma-sg checks for dma direction for
every single page and videobuf2-dc lacks any dma direction
checks and calls set_page_dirty_lock unconditionally.

Thus unify and align the invocations of set_page_dirty_lock
for videobuf2-dc, videobuf2-sg  memory allocators with
videobuf2-vmalloc, i.e. the pattern used in vmalloc has been
copied to dc and dma-sg.
Suggested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/v4l2-core/videobuf2-dma-contig.c

@@ -434,6 +434,8 @@ static void vb2_dc_put_userptr(void *buf_priv)
 		pages = frame_vector_pages(buf->vec);
 		/* sgt should exist only if vector contains pages... */
 		BUG_ON(IS_ERR(pages));
+		if (buf->dma_dir == DMA_FROM_DEVICE ||
+		    buf->dma_dir == DMA_BIDIRECTIONAL)
 			for (i = 0; i < frame_vector_count(buf->vec); i++)
 				set_page_dirty_lock(pages[i]);
 		sg_free_table(sgt);

drivers/media/v4l2-core/videobuf2-dma-sg.c

@@ -292,11 +292,10 @@ static void vb2_dma_sg_put_userptr(void *buf_priv)
 	if (buf->vaddr)
 		vm_unmap_ram(buf->vaddr, buf->num_pages);
 	sg_free_table(buf->dma_sgt);
-	while (--i >= 0) {
 	if (buf->dma_dir == DMA_FROM_DEVICE ||
 	    buf->dma_dir == DMA_BIDIRECTIONAL)
+		while (--i >= 0)
 			set_page_dirty_lock(buf->pages[i]);
-	}
 	vb2_destroy_framevec(buf->vec);
 	kfree(buf);
 }