this add functions for:
  - remove buffers from src/dst queue by index
  - remove exact buffer from src/dst queue

also extends m2m API to iterate over a list of src/dst buffers
in safely and non-safely manner.

Signed-off-by: Stanimir Varbanov <stanimir.varba...@linaro.org>
---
 drivers/media/v4l2-core/v4l2-mem2mem.c | 37 +++++++++++++++
 include/media/v4l2-mem2mem.h           | 83 ++++++++++++++++++++++++++++++++++
 2 files changed, 120 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c 
b/drivers/media/v4l2-core/v4l2-mem2mem.c
index 6bc27e7b2a33..d689e7bb964f 100644
--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
@@ -126,6 +126,43 @@ void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx)
 }
 EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove);
 
+void v4l2_m2m_buf_remove_exact(struct v4l2_m2m_queue_ctx *q_ctx,
+                              struct vb2_v4l2_buffer *vbuf)
+{
+       struct v4l2_m2m_buffer *b;
+       unsigned long flags;
+
+       spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
+       b = container_of(vbuf, struct v4l2_m2m_buffer, vb);
+       list_del(&b->list);
+       q_ctx->num_rdy--;
+       spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
+}
+EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove_exact);
+
+struct vb2_v4l2_buffer *
+v4l2_m2m_buf_remove_by_idx(struct v4l2_m2m_queue_ctx *q_ctx, unsigned int idx)
+
+{
+       struct v4l2_m2m_buffer *b, *tmp;
+       struct vb2_v4l2_buffer *ret = NULL;
+       unsigned long flags;
+
+       spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
+       list_for_each_entry_safe(b, tmp, &q_ctx->rdy_queue, list) {
+               if (b->vb.vb2_buf.index == idx) {
+                       list_del(&b->list);
+                       q_ctx->num_rdy--;
+                       ret = &b->vb;
+                       break;
+               }
+       }
+       spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
+
+       return ret;
+}
+EXPORT_SYMBOL_GPL(v4l2_m2m_buf_remove_by_idx);
+
 /*
  * Scheduling handlers
  */
diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h
index 3ccd01bd245e..c8632c52d5e2 100644
--- a/include/media/v4l2-mem2mem.h
+++ b/include/media/v4l2-mem2mem.h
@@ -437,6 +437,41 @@ static inline void *v4l2_m2m_next_dst_buf(struct 
v4l2_m2m_ctx *m2m_ctx)
 }
 
 /**
+ * v4l2_m2m_for_each_dst_buf() - iterate over a list of destination ready
+ * buffers
+ *
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ */
+#define v4l2_m2m_for_each_dst_buf(m2m_ctx, b)  \
+       list_for_each_entry(b, &m2m_ctx->cap_q_ctx.rdy_queue, list)
+
+/**
+ * v4l2_m2m_for_each_src_buf() - iterate over a list of source ready buffers
+ *
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ */
+#define v4l2_m2m_for_each_src_buf(m2m_ctx, b)  \
+       list_for_each_entry(b, &m2m_ctx->out_q_ctx.rdy_queue, list)
+
+/**
+ * v4l2_m2m_for_each_dst_buf_safe() - iterate over a list of destination ready
+ * buffers safely
+ *
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ */
+#define v4l2_m2m_for_each_dst_buf_safe(m2m_ctx, b, n)  \
+       list_for_each_entry_safe(b, n, &m2m_ctx->cap_q_ctx.rdy_queue, list)
+
+/**
+ * v4l2_m2m_for_each_src_buf_safe() - iterate over a list of source ready
+ * buffers safely
+ *
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ */
+#define v4l2_m2m_for_each_src_buf_safe(m2m_ctx, b, n)  \
+       list_for_each_entry_safe(b, n, &m2m_ctx->out_q_ctx.rdy_queue, list)
+
+/**
  * v4l2_m2m_get_src_vq() - return vb2_queue for source buffers
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
@@ -488,6 +523,54 @@ static inline void *v4l2_m2m_dst_buf_remove(struct 
v4l2_m2m_ctx *m2m_ctx)
        return v4l2_m2m_buf_remove(&m2m_ctx->cap_q_ctx);
 }
 
+/**
+ * v4l2_m2m_buf_remove_exact() - take off exact buffer from the list of ready
+ * buffers
+ *
+ * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx
+ */
+void v4l2_m2m_buf_remove_exact(struct v4l2_m2m_queue_ctx *q_ctx,
+                              struct vb2_v4l2_buffer *vbuf);
+
+/**
+ * v4l2_m2m_src_buf_remove_exact() - take off exact source 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_src_buf_remove_exact(struct v4l2_m2m_ctx *m2m_ctx,
+                                                struct vb2_v4l2_buffer *vbuf)
+{
+       v4l2_m2m_buf_remove_exact(&m2m_ctx->out_q_ctx, vbuf);
+}
+
+/**
+ * v4l2_m2m_src_buf_remove_exact() - take off exact 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_dst_buf_remove_exact(struct v4l2_m2m_ctx *m2m_ctx,
+                                                struct vb2_v4l2_buffer *vbuf)
+{
+       v4l2_m2m_buf_remove_exact(&m2m_ctx->cap_q_ctx, vbuf);
+}
+
+struct vb2_v4l2_buffer *
+v4l2_m2m_buf_remove_by_idx(struct v4l2_m2m_queue_ctx *q_ctx, unsigned int idx);
+
+static inline struct vb2_v4l2_buffer *
+v4l2_m2m_src_buf_remove_by_idx(struct v4l2_m2m_ctx *m2m_ctx, unsigned int idx)
+{
+       return v4l2_m2m_buf_remove_by_idx(&m2m_ctx->out_q_ctx, idx);
+}
+
+static inline struct vb2_v4l2_buffer *
+v4l2_m2m_dst_buf_remove_by_idx(struct v4l2_m2m_ctx *m2m_ctx, unsigned int idx)
+{
+       return v4l2_m2m_buf_remove_by_idx(&m2m_ctx->cap_q_ctx, idx);
+}
+
 /* v4l2 ioctl helpers */
 
 int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv,
-- 
2.7.4

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