diff mbox series

[v3,1/6] media: videobuf2: Don't assert held reservation lock for dma-buf mmapping

Message ID 20230521205112.150206-2-dmitry.osipenko@collabora.com (mailing list archive)
State New, archived
Headers show
Series Move dma-buf mmap() reservation locking down to exporters | expand

Commit Message

Dmitry Osipenko May 21, 2023, 8:51 p.m. UTC 
Don't assert held dma-buf reservation lock on memory mapping of exported
buffer.

We're going to change dma-buf mmap() locking policy such that exporters
will have to handle the lock. The previous locking policy caused deadlock
problem for DRM drivers in a case of self-imported dma-bufs once these
drivers are moved to use reservation lock universally. The problem is
solved by moving the lock down to exporters. This patch prepares videobuf2
for the locking policy update.

Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 drivers/media/common/videobuf2/videobuf2-dma-contig.c | 3 ---
 drivers/media/common/videobuf2/videobuf2-dma-sg.c     | 3 ---
 drivers/media/common/videobuf2/videobuf2-vmalloc.c    | 3 ---
 3 files changed, 9 deletions(-)
diff mbox series

Patch

diff --git a/drivers/media/common/videobuf2/videobuf2-dma-contig.c b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
index 205d3cac425c..2fa455d4a048 100644
--- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c
+++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
@@ -11,7 +11,6 @@ 
  */
 
 #include <linux/dma-buf.h>
-#include <linux/dma-resv.h>
 #include <linux/module.h>
 #include <linux/refcount.h>
 #include <linux/scatterlist.h>
@@ -456,8 +455,6 @@  static int vb2_dc_dmabuf_ops_vmap(struct dma_buf *dbuf, struct iosys_map *map)
 static int vb2_dc_dmabuf_ops_mmap(struct dma_buf *dbuf,
 	struct vm_area_struct *vma)
 {
-	dma_resv_assert_held(dbuf->resv);
-
 	return vb2_dc_mmap(dbuf->priv, vma);
 }
 
diff --git a/drivers/media/common/videobuf2/videobuf2-dma-sg.c b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
index 183037fb1273..28f3fdfe23a2 100644
--- a/drivers/media/common/videobuf2/videobuf2-dma-sg.c
+++ b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
@@ -10,7 +10,6 @@ 
  * the Free Software Foundation.
  */
 
-#include <linux/dma-resv.h>
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/refcount.h>
@@ -498,8 +497,6 @@  static int vb2_dma_sg_dmabuf_ops_vmap(struct dma_buf *dbuf,
 static int vb2_dma_sg_dmabuf_ops_mmap(struct dma_buf *dbuf,
 	struct vm_area_struct *vma)
 {
-	dma_resv_assert_held(dbuf->resv);
-
 	return vb2_dma_sg_mmap(dbuf->priv, vma);
 }
 
diff --git a/drivers/media/common/videobuf2/videobuf2-vmalloc.c b/drivers/media/common/videobuf2/videobuf2-vmalloc.c
index a6c6d2fcaaa4..7c635e292106 100644
--- a/drivers/media/common/videobuf2/videobuf2-vmalloc.c
+++ b/drivers/media/common/videobuf2/videobuf2-vmalloc.c
@@ -10,7 +10,6 @@ 
  * the Free Software Foundation.
  */
 
-#include <linux/dma-resv.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/mm.h>
@@ -319,8 +318,6 @@  static int vb2_vmalloc_dmabuf_ops_vmap(struct dma_buf *dbuf,
 static int vb2_vmalloc_dmabuf_ops_mmap(struct dma_buf *dbuf,
 	struct vm_area_struct *vma)
 {
-	dma_resv_assert_held(dbuf->resv);
-
 	return vb2_vmalloc_mmap(dbuf->priv, vma);
 }