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media: vb2: frame_vector.c: replace WARN_ONCE with a comment
[ Upstream commit 735de5caf7
]
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-cisco@xs4all.nl>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reported-by: Yikebaer Aizezi <yikebaer61@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 4 additions and 2 deletions
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@ -30,6 +30,10 @@
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* different type underlying the specified range of virtual addresses.
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* When the function isn't able to map a single page, it returns error.
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*
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* Note that get_vaddr_frames() cannot follow VM_IO mappings. It used
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* to be able to do that, but that could (racily) return non-refcounted
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* pfns.
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*
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* This function takes care of grabbing mmap_lock as necessary.
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*/
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int get_vaddr_frames(unsigned long start, unsigned int nr_frames,
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@ -55,8 +59,6 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames,
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if (likely(ret > 0))
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return ret;
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/* This used to (racily) return non-refcounted pfns. Let people know */
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WARN_ONCE(1, "get_vaddr_frames() cannot follow VM_IO mapping");
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vec->nr_frames = 0;
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return ret ? ret : -EFAULT;
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}
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