V4L/DVB (6058): ivtv: add support for highmem udma

When trying to DMA userspace buffers to the cx23415 you need to check
whether the page is in highmem. If this is the case, then bounce buffers
have to be used to allow DMA.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/media/video/ivtv/ivtv-driver.h b/drivers/media/video/ivtv/ivtv-driver.h
index 93a008409f49..784098d4bf04 100644
--- a/drivers/media/video/ivtv/ivtv-driver.h
+++ b/drivers/media/video/ivtv/ivtv-driver.h
@@ -419,6 +419,8 @@ struct ivtv_user_dma {
         struct mutex lock;
         int page_count;
         struct page *map[IVTV_DMA_SG_OSD_ENT];
+        /* Needed when dealing with highmem userspace buffers */
+        struct page *bouncemap[IVTV_DMA_SG_OSD_ENT];
 
         /* Base Dev SG Array for cx23415/6 */
         struct ivtv_sg_element SGarray[IVTV_DMA_SG_OSD_ENT];