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-rw-r--r--drivers/media/v4l2-core/v4l2-mem2mem.c18
-rw-r--r--include/media/v4l2-mem2mem.h29
2 files changed, 47 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
index 4aeedb91594a..d9565ee44578 100644
--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
@@ -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;
diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h
index d60d3060f762..d655720e16a1 100644
--- a/include/media/v4l2-mem2mem.h
+++ b/include/media/v4l2-mem2mem.h
@@ -450,6 +450,35 @@ static inline void *v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_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
*

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