From: Ezequiel Garcia <ezequiel@collabora.com>
Date: Thu, 18 Oct 2018 18:02:21 +0000 (-0400)
Subject: media: v4l2-ioctl.c: Simplify locking for m2m devices
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=542a522d32efb613cfc929bdbf2c4160359167f9;p=openwrt%2Fstaging%2Fblogic.git

media: v4l2-ioctl.c: Simplify locking for m2m devices

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 <ezequiel@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
---

diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index f41d1ac21977..e384142d2826 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -2693,45 +2693,6 @@ 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)
@@ -2741,12 +2702,8 @@ 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 &&