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>
diff --git a/drivers/media/video/ivtv/ivtv-driver.h b/drivers/media/video/ivtv/ivtv-driver.h
index 93a0084..784098d 100644
--- a/drivers/media/video/ivtv/ivtv-driver.h
+++ b/drivers/media/video/ivtv/ivtv-driver.h
@@ -419,6 +419,8 @@
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];