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media: v4l2-mem2mem: add v4l2_m2m_last_buf()

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This can be used to mark the last queued source buffer as the last
buffer.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil 2018-06-26 09:26:52 -04:00 committed by Mauro Carvalho Chehab
parent 62c3fce041
commit ee1228cca1
2 changed files with 47 additions and 0 deletions
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18
drivers/media/v4l2-core/v4l2-mem2mem.c
View file

@ -129,6 +129,24 @@ void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx)
}
EXPORT_SYMBOL_GPL(v4l2_m2m_next_buf);
void *v4l2_m2m_last_buf(struct v4l2_m2m_queue_ctx *q_ctx)
{
struct v4l2_m2m_buffer *b;
unsigned long flags;
spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
if (list_empty(&q_ctx->rdy_queue)) {
spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
return NULL;
}
b = list_last_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);
spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
return &b->vb;
}
EXPORT_SYMBOL_GPL(v4l2_m2m_last_buf);
void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx)
{
struct v4l2_m2m_buffer *b;

29
include/media/v4l2-mem2mem.h
View file

@ -449,6 +449,35 @@ static inline void *v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_ctx)
return v4l2_m2m_next_buf(&m2m_ctx->cap_q_ctx);
}
/**
* v4l2_m2m_last_buf() - return last buffer from the list of ready buffers
*
* @q_ctx: pointer to struct @v4l2_m2m_queue_ctx
*/
void *v4l2_m2m_last_buf(struct v4l2_m2m_queue_ctx *q_ctx);
/**
* v4l2_m2m_last_src_buf() - return last destination buffer from the list of
* ready buffers
*
* @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
*/
static inline void *v4l2_m2m_last_src_buf(struct v4l2_m2m_ctx *m2m_ctx)
{
return v4l2_m2m_last_buf(&m2m_ctx->out_q_ctx);
}
/**
* v4l2_m2m_last_dst_buf() - return last destination buffer from the list of
* ready buffers
*
* @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
*/
static inline void *v4l2_m2m_last_dst_buf(struct v4l2_m2m_ctx *m2m_ctx)
{
return v4l2_m2m_last_buf(&m2m_ctx->cap_q_ctx);
}
/**
* v4l2_m2m_for_each_dst_buf() - iterate over a list of destination ready
* buffers