[media] v4l2-mem2mem: drop rdy_queue on STREAMOFF

When a v4l2-mem2mem context gets a STREAMOFF call on either its CAPTURE
or OUTPUT queues, we should:
* Drop the corresponding rdy_queue, since a subsequent STREAMON expects
  an empty queue.
* Deschedule the context, as it now has at least one empty queue and
  cannot run.

Signed-off-by: John Sheu <sheu@google.com>
Acked-by: Pawel Osciak <pawel@osciak.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 28 insertions, 3 deletions

diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
index 27ddb3d15251..66f599fcb829 100644
--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
@@ -408,10 +408,35 @@ EXPORT_SYMBOL_GPL(v4l2_m2m_streamon);
 int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
                        enum v4l2_buf_type type)
 {
-        struct vb2_queue *vq;
+        struct v4l2_m2m_dev *m2m_dev;
+        struct v4l2_m2m_queue_ctx *q_ctx;
+        unsigned long flags_job, flags;
+        int ret;
 
-        vq = v4l2_m2m_get_vq(m2m_ctx, type);
-        return vb2_streamoff(vq, type);
+        q_ctx = get_queue_ctx(m2m_ctx, type);
+        ret = vb2_streamoff(&q_ctx->q, type);
+        if (ret)
+                return ret;
+
+        m2m_dev = m2m_ctx->m2m_dev;
+        spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job);
+        /* We should not be scheduled anymore, since we're dropping a queue. */
+        INIT_LIST_HEAD(&m2m_ctx->queue);
+        m2m_ctx->job_flags = 0;
+
+        spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);
+        /* Drop queue, since streamoff returns device to the same state as after
+         * calling reqbufs. */
+        INIT_LIST_HEAD(&q_ctx->rdy_queue);
+        spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);
+
+        if (m2m_dev->curr_ctx == m2m_ctx) {
+                m2m_dev->curr_ctx = NULL;
+                wake_up(&m2m_ctx->finished);
+        }
+        spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
+
+        return 0;
 }
 EXPORT_SYMBOL_GPL(v4l2_m2m_streamoff);