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Subject: media: vb2: frame_vector.c: replace WARN_ONCE with a comment
Author: Hans Verkuil <hverkuil-ci...@xs4all.nl>
Date: Thu Aug 17 12:41:32 2023 +0200
The WARN_ONCE was issued also in cases that had nothing to do with VM_IO
(e.g. if the start address was just a random value and uaccess fails with
-EFAULT).
There are no reports of WARN_ONCE being issued for actual VM_IO cases, so
just drop it and instead add a note to the comment before the function.
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
Reviewed-by: David Hildenbrand <da...@redhat.com>
Reported-by: Yikebaer Aizezi <yikebae...@gmail.com>
drivers/media/common/videobuf2/frame_vector.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/drivers/media/common/videobuf2/frame_vector.c
b/drivers/media/common/videobuf2/frame_vector.c
index 0f430ddc1f67..fd87747be9b1 100644
--- a/drivers/media/common/videobuf2/frame_vector.c
+++ b/drivers/media/common/videobuf2/frame_vector.c
@@ -31,6 +31,10 @@
* different type underlying the specified range of virtual addresses.
* When the function isn't able to map a single page, it returns error.
*
+ * Note that get_vaddr_frames() cannot follow VM_IO mappings. It used
+ * to be able to do that, but that could (racily) return non-refcounted
+ * pfns.
+ *
* This function takes care of grabbing mmap_lock as necessary.
*/
int get_vaddr_frames(unsigned long start, unsigned int nr_frames, bool write,
@@ -59,8 +63,6 @@ int get_vaddr_frames(unsigned long start, unsigned int
nr_frames, bool write,
if (likely(ret > 0))
return ret;
- /* This used to (racily) return non-refcounted pfns. Let people know */
- WARN_ONCE(1, "get_vaddr_frames() cannot follow VM_IO mapping");
vec->nr_frames = 0;
return ret ? ret : -EFAULT;
}
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