The variable q->num_buffers records the number of buffers previously applied for, and the variable allocated_buffers records the number of buffers applied for this time, so the total number should be the sum of these two buffers. Signed-off-by: Dianlong Li <dianlong_lee@xxxxxxx> --- drivers/media/common/videobuf2/videobuf2-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c index 4eab6d81cce1..2716c4138655 100644 --- a/drivers/media/common/videobuf2/videobuf2-core.c +++ b/drivers/media/common/videobuf2/videobuf2-core.c @@ -836,7 +836,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, } mutex_lock(&q->mmap_lock); - q->num_buffers = allocated_buffers; + q->num_buffers += allocated_buffers; if (ret < 0) { /* -- 2.25.1