From: Satendra Singh Thakur <satendra.t@xxxxxxxxxxx>
When the func vb2_core_reqbufs is called first time after
vb2_core_queue_init(), the condition q->memory != memory always gets
satisfied, since q->memory was set to 0 at vb2_core_queue_init().
After the condition is true, unnecessary calls to __vb2_queue_cancel()
and __vb2_queue_free() are done. in such case, *count is non-zero,
q->num_buffers is zero and q->memory is 0, which is not equal to
memory field *count=N, q->num_buffers=0, q->memory != memory.
[mchehab@xxxxxxxxxxxxxxxx: fix checkpatch issues]
Signed-off-by: Satendra Singh Thakur <satendra.t@xxxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
---
drivers/media/v4l2-core/videobuf2-core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index cb115ba6a1d2..21017b478a34 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -662,7 +662,8 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
return -EBUSY;
}
- if (*count == 0 || q->num_buffers != 0 || q->memory != memory) {
+ if (*count == 0 || q->num_buffers != 0 ||
+ (q->memory && q->memory != memory)) {
/*
* We already have buffers allocated, so first check if they
* are not in use and can be freed.
--
2.14.3
--
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