[media] ivtv: switch to the v4l core lock

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/ivtv/ivtv-fileops.c

@@ -268,11 +268,13 @@ static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block,
 		}
 
 		/* wait for more data to arrive */
+		mutex_unlock(&itv->serialize_lock);
 		prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 		/* New buffers might have become available before we were added to the waitqueue */
 		if (!s->q_full.buffers)
 			schedule();
 		finish_wait(&s->waitq, &wait);
+		mutex_lock(&itv->serialize_lock);
 		if (signal_pending(current)) {
 			/* return if a signal was received */
 			IVTV_DEBUG_INFO("User stopped %s\n", s->name);
@@ -507,9 +509,7 @@ ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_
 
 	IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
 
-	mutex_lock(&itv->serialize_lock);
 	rc = ivtv_start_capture(id);
-	mutex_unlock(&itv->serialize_lock);
 	if (rc)
 		return rc;
 	return ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
@@ -584,9 +584,7 @@ ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t c
 	set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 
 	/* Start decoder (returns 0 if already started) */
-	mutex_lock(&itv->serialize_lock);
 	rc = ivtv_start_decoding(id, itv->speed);
-	mutex_unlock(&itv->serialize_lock);
 	if (rc) {
 		IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
 
@@ -627,11 +625,13 @@ ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t c
 			break;
 		if (filp->f_flags & O_NONBLOCK)
 			return -EAGAIN;
+		mutex_unlock(&itv->serialize_lock);
 		prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 		/* New buffers might have become free before we were added to the waitqueue */
 		if (!s->q_free.buffers)
 			schedule();
 		finish_wait(&s->waitq, &wait);
+		mutex_lock(&itv->serialize_lock);
 		if (signal_pending(current)) {
 			IVTV_DEBUG_INFO("User stopped %s\n", s->name);
 			return -EINTR;
@@ -686,12 +686,14 @@ ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t c
 			if (mode == OUT_YUV)
 				ivtv_yuv_setup_stream_frame(itv);
 
+			mutex_unlock(&itv->serialize_lock);
 			prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
 			while (!(got_sig = signal_pending(current)) &&
 					test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
 				schedule();
 			}
 			finish_wait(&itv->dma_waitq, &wait);
+			mutex_lock(&itv->serialize_lock);
 			if (got_sig) {
 				IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
 				return -EINTR;
@@ -756,9 +758,7 @@ unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
 	if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 		int rc;
 
-		mutex_lock(&itv->serialize_lock);
 		rc = ivtv_start_capture(id);
-		mutex_unlock(&itv->serialize_lock);
 		if (rc) {
 			IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
 					s->name, rc);
@@ -861,7 +861,6 @@ int ivtv_v4l2_close(struct file *filp)
 
 	IVTV_DEBUG_FILE("close %s\n", s->name);
 
-	mutex_lock(&itv->serialize_lock);
 	/* Stop radio */
 	if (id->type == IVTV_ENC_STREAM_TYPE_RAD &&
 			v4l2_fh_is_singular_file(filp)) {
@@ -893,7 +892,6 @@ int ivtv_v4l2_close(struct file *filp)
 	/* Easy case first: this stream was never claimed by us */
 	if (s->id != id->open_id) {
 		kfree(id);
-		mutex_unlock(&itv->serialize_lock);
 		return 0;
 	}
 
@@ -914,21 +912,25 @@ int ivtv_v4l2_close(struct file *filp)
 		ivtv_stop_capture(id, 0);
 	}
 	kfree(id);
-	mutex_unlock(&itv->serialize_lock);
 	return 0;
 }
 
-static int ivtv_serialized_open(struct ivtv_stream *s, struct file *filp)
+int ivtv_v4l2_open(struct file *filp)
 {
-#ifdef CONFIG_VIDEO_ADV_DEBUG
 	struct video_device *vdev = video_devdata(filp);
-#endif
+	struct ivtv_stream *s = video_get_drvdata(vdev);
 	struct ivtv *itv = s->itv;
 	struct ivtv_open_id *item;
 	int res = 0;
 
 	IVTV_DEBUG_FILE("open %s\n", s->name);
 
+	if (ivtv_init_on_first_open(itv)) {
+		IVTV_ERR("Failed to initialize on device %s\n",
+			 video_device_node_name(vdev));
+		return -ENXIO;
+	}
+
 #ifdef CONFIG_VIDEO_ADV_DEBUG
 	/* Unless ivtv_fw_debug is set, error out if firmware dead. */
 	if (ivtv_fw_debug) {
@@ -1017,28 +1019,6 @@ static int ivtv_serialized_open(struct ivtv_stream *s, struct file *filp)
 	return 0;
 }
 
-int ivtv_v4l2_open(struct file *filp)
-{
-	int res;
-	struct ivtv *itv = NULL;
-	struct ivtv_stream *s = NULL;
-	struct video_device *vdev = video_devdata(filp);
-
-	s = video_get_drvdata(vdev);
-	itv = s->itv;
-
-	mutex_lock(&itv->serialize_lock);
-	if (ivtv_init_on_first_open(itv)) {
-		IVTV_ERR("Failed to initialize on device %s\n",
-			 video_device_node_name(vdev));
-		mutex_unlock(&itv->serialize_lock);
-		return -ENXIO;
-	}
-	res = ivtv_serialized_open(s, filp);
-	mutex_unlock(&itv->serialize_lock);
-	return res;
-}
-
 void ivtv_mute(struct ivtv *itv)
 {
 	if (atomic_read(&itv->capturing))

drivers/media/video/ivtv/ivtv-ioctl.c

@@ -179,6 +179,7 @@ int ivtv_set_speed(struct ivtv *itv, int speed)
 		ivtv_vapi(itv, CX2341X_DEC_PAUSE_PLAYBACK, 1, 0);
 
 		/* Wait for any DMA to finish */
+		mutex_unlock(&itv->serialize_lock);
 		prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
 		while (test_bit(IVTV_F_I_DMA, &itv->i_flags)) {
 			got_sig = signal_pending(current);
@@ -188,6 +189,7 @@ int ivtv_set_speed(struct ivtv *itv, int speed)
 			schedule();
 		}
 		finish_wait(&itv->dma_waitq, &wait);
+		mutex_lock(&itv->serialize_lock);
 		if (got_sig)
 			return -EINTR;
 
@@ -1107,6 +1109,7 @@ void ivtv_s_std_dec(struct ivtv *itv, v4l2_std_id *std)
 	 * happens within the first 100 lines of the top field.
 	 * Make 4 attempts to sync to the decoder before giving up.
 	 */
+	mutex_unlock(&itv->serialize_lock);
 	for (f = 0; f < 4; f++) {
 		prepare_to_wait(&itv->vsync_waitq, &wait,
 				TASK_UNINTERRUPTIBLE);
@@ -1115,6 +1118,7 @@ void ivtv_s_std_dec(struct ivtv *itv, v4l2_std_id *std)
 		schedule_timeout(msecs_to_jiffies(25));
 	}
 	finish_wait(&itv->vsync_waitq, &wait);
+	mutex_lock(&itv->serialize_lock);
 
 	if (f == 4)
 		IVTV_WARN("Mode change failed to sync to decoder\n");
@@ -1842,8 +1846,7 @@ static long ivtv_default(struct file *file, void *fh, bool valid_prio,
 	return 0;
 }
 
-static long ivtv_serialized_ioctl(struct ivtv *itv, struct file *filp,
-		unsigned int cmd, unsigned long arg)
+long ivtv_v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
 	struct video_device *vfd = video_devdata(filp);
 	long ret;
@@ -1855,21 +1858,6 @@ static long ivtv_serialized_ioctl(struct ivtv *itv, struct file *filp,
 	return ret;
 }
 
-long ivtv_v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
-{
-	struct ivtv_open_id *id = fh2id(filp->private_data);
-	struct ivtv *itv = id->itv;
-	long res;
-
-	/* DQEVENT can block, so this should not run with the serialize lock */
-	if (cmd == VIDIOC_DQEVENT)
-		return ivtv_serialized_ioctl(itv, filp, cmd, arg);
-	mutex_lock(&itv->serialize_lock);
-	res = ivtv_serialized_ioctl(itv, filp, cmd, arg);
-	mutex_unlock(&itv->serialize_lock);
-	return res;
-}
-
 static const struct v4l2_ioctl_ops ivtv_ioctl_ops = {
 	.vidioc_querycap    		    = ivtv_querycap,
 	.vidioc_s_audio     		    = ivtv_s_audio,

drivers/media/video/ivtv/ivtv-streams.c

@@ -214,6 +214,7 @@ static int ivtv_prep_dev(struct ivtv *itv, int type)
 	s->vdev->fops = ivtv_stream_info[type].fops;
 	s->vdev->release = video_device_release;
 	s->vdev->tvnorms = V4L2_STD_ALL;
+	s->vdev->lock = &itv->serialize_lock;
 	set_bit(V4L2_FL_USE_FH_PRIO, &s->vdev->flags);
 	ivtv_set_funcs(s->vdev);
 	return 0;

drivers/media/video/ivtv/ivtv-yuv.c

@@ -1149,23 +1149,37 @@ int ivtv_yuv_udma_stream_frame(struct ivtv *itv, void __user *src)
 {
 	struct yuv_playback_info *yi = &itv->yuv_info;
 	struct ivtv_dma_frame dma_args;
+	int res;
 
 	ivtv_yuv_setup_stream_frame(itv);
 
 	/* We only need to supply source addresses for this */
 	dma_args.y_source = src;
 	dma_args.uv_source = src + 720 * ((yi->v4l2_src_h + 31) & ~31);
-	return ivtv_yuv_udma_frame(itv, &dma_args);
+	/* Wait for frame DMA. Note that serialize_lock is locked,
+	   so to allow other processes to access the driver while
+	   we are waiting unlock first and later lock again. */
+	mutex_unlock(&itv->serialize_lock);
+	res = ivtv_yuv_udma_frame(itv, &dma_args);
+	mutex_lock(&itv->serialize_lock);
+	return res;
 }
 
 /* IVTV_IOC_DMA_FRAME ioctl handler */
 int ivtv_yuv_prep_frame(struct ivtv *itv, struct ivtv_dma_frame *args)
 {
-/*	IVTV_DEBUG_INFO("yuv_prep_frame\n"); */
+	int res;
 
+/*	IVTV_DEBUG_INFO("yuv_prep_frame\n"); */
 	ivtv_yuv_next_free(itv);
 	ivtv_yuv_setup_frame(itv, args);
-	return ivtv_yuv_udma_frame(itv, args);
+	/* Wait for frame DMA. Note that serialize_lock is locked,
+	   so to allow other processes to access the driver while
+	   we are waiting unlock first and later lock again. */
+	mutex_unlock(&itv->serialize_lock);
+	res = ivtv_yuv_udma_frame(itv, args);
+	mutex_lock(&itv->serialize_lock);
+	return res;
 }
 
 void ivtv_yuv_close(struct ivtv *itv)
@@ -1174,7 +1188,9 @@ void ivtv_yuv_close(struct ivtv *itv)
 	int h_filter, v_filter_1, v_filter_2;
 
 	IVTV_DEBUG_YUV("ivtv_yuv_close\n");
+	mutex_unlock(&itv->serialize_lock);
 	ivtv_waitq(&itv->vsync_waitq);
+	mutex_lock(&itv->serialize_lock);
 
 	yi->running = 0;
 	atomic_set(&yi->next_dma_frame, -1);