[PATCH v5 2/5] v4l2-ioctl.c: Simplify locking for m2m devices

[Ezequiel Garcia]

Now that the mutexes for output and capture vb2 queues match,
it is possible to refer to the context q_lock as the
m2m lock for a given m2m context.

Remove the output/capture lock selection.

Signed-off-by: Ezequiel Garcia <ezequ...@collabora.com>
---
 drivers/media/v4l2-core/v4l2-ioctl.c | 47 ++--------------------------
 1 file changed, 2 insertions(+), 45 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c 
b/drivers/media/v4l2-core/v4l2-ioctl.c
index c63746968fa3..54919c227bc1 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -2679,45 +2679,6 @@ static bool v4l2_is_known_ioctl(unsigned int cmd)
        return v4l2_ioctls[_IOC_NR(cmd)].ioctl == cmd;
 }
 
-#if IS_ENABLED(CONFIG_V4L2_MEM2MEM_DEV)
-static bool v4l2_ioctl_m2m_queue_is_output(unsigned int cmd, void *arg)
-{
-       switch (cmd) {
-       case VIDIOC_CREATE_BUFS: {
-               struct v4l2_create_buffers *cbufs = arg;
-
-               return V4L2_TYPE_IS_OUTPUT(cbufs->format.type);
-       }
-       case VIDIOC_REQBUFS: {
-               struct v4l2_requestbuffers *rbufs = arg;
-
-               return V4L2_TYPE_IS_OUTPUT(rbufs->type);
-       }
-       case VIDIOC_QBUF:
-       case VIDIOC_DQBUF:
-       case VIDIOC_QUERYBUF:
-       case VIDIOC_PREPARE_BUF: {
-               struct v4l2_buffer *buf = arg;
-
-               return V4L2_TYPE_IS_OUTPUT(buf->type);
-       }
-       case VIDIOC_EXPBUF: {
-               struct v4l2_exportbuffer *expbuf = arg;
-
-               return V4L2_TYPE_IS_OUTPUT(expbuf->type);
-       }
-       case VIDIOC_STREAMON:
-       case VIDIOC_STREAMOFF: {
-               int *type = arg;
-
-               return V4L2_TYPE_IS_OUTPUT(*type);
-       }
-       default:
-               return false;
-       }
-}
-#endif
-
 static struct mutex *v4l2_ioctl_get_lock(struct video_device *vdev,
                                         struct v4l2_fh *vfh, unsigned int cmd,
                                         void *arg)
@@ -2727,12 +2688,8 @@ static struct mutex *v4l2_ioctl_get_lock(struct 
video_device *vdev,
 #if IS_ENABLED(CONFIG_V4L2_MEM2MEM_DEV)
        if (vfh && vfh->m2m_ctx &&
            (v4l2_ioctls[_IOC_NR(cmd)].flags & INFO_FL_QUEUE)) {
-               bool is_output = v4l2_ioctl_m2m_queue_is_output(cmd, arg);
-               struct v4l2_m2m_queue_ctx *ctx = is_output ?
-                       &vfh->m2m_ctx->out_q_ctx : &vfh->m2m_ctx->cap_q_ctx;
-
-               if (ctx->q.lock)
-                       return ctx->q.lock;
+               if (vfh->m2m_ctx->q_lock)
+                       return vfh->m2m_ctx->q_lock;
        }
 #endif
        if (vdev->queue && vdev->queue->lock &&
-- 
2.19.1