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Commit 4aebc289 authored by David Ellingsworth's avatar David Ellingsworth Committed by Mauro Carvalho Chehab
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V4L/DVB (13060): radio-mr800: implement proper locking 



Implement proper locking

Signed-off-by: default avatarDavid Ellingsworth <david@identd.dyndns.org>
Acked-by: default avatarAlexey Klimov <klimov.linux@gmail.com>
Signed-off-by: default avatarDouglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 0f017212

drivers/media/radio/radio-mr800.c

+106 −75
Original line number Diff line number Diff line
@@ -168,11 +168,7 @@ static int amradio_set_mute(struct amradio_device *radio, char argument) 
	int retval;

	int size;



	/* safety check */

	if (radio->removed)

		return -EIO;



	mutex_lock(&radio->lock);

	BUG_ON(!mutex_is_locked(&radio->lock));



	radio->buffer[0] = 0x00;

	radio->buffer[1] = 0x55;
@@ -186,15 +182,11 @@ static int amradio_set_mute(struct amradio_device *radio, char argument) 
	retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),

		(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);



	if (retval < 0 || size != BUFFER_LENGTH) {

		mutex_unlock(&radio->lock);

	if (retval < 0 || size != BUFFER_LENGTH)

		return retval;

	}



	radio->muted = argument;



	mutex_unlock(&radio->lock);



	return retval;

}
@@ -205,11 +197,7 @@ static int amradio_setfreq(struct amradio_device *radio, int freq) 
	int size;

	unsigned short freq_send = 0x10 + (freq >> 3) / 25;



	/* safety check */

	if (radio->removed)

		return -EIO;



	mutex_lock(&radio->lock);

	BUG_ON(!mutex_is_locked(&radio->lock));



	radio->buffer[0] = 0x00;

	radio->buffer[1] = 0x55;
@@ -223,10 +211,8 @@ static int amradio_setfreq(struct amradio_device *radio, int freq) 
	retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),

		(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);



	if (retval < 0 || size != BUFFER_LENGTH) {

		mutex_unlock(&radio->lock);

	if (retval < 0 || size != BUFFER_LENGTH)

		return retval;

	}



	/* frequency is calculated from freq_send and placed in first 2 bytes */

	radio->buffer[0] = (freq_send >> 8) & 0xff;
@@ -240,13 +226,6 @@ static int amradio_setfreq(struct amradio_device *radio, int freq) 
	retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),

		(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);



	if (retval < 0 || size != BUFFER_LENGTH) {

		mutex_unlock(&radio->lock);

		return retval;

	}



	mutex_unlock(&radio->lock);



	return retval;

}
@@ -255,11 +234,7 @@ static int amradio_set_stereo(struct amradio_device *radio, char argument) 
	int retval;

	int size;



	/* safety check */

	if (radio->removed)

		return -EIO;



	mutex_lock(&radio->lock);

	BUG_ON(!mutex_is_locked(&radio->lock));



	radio->buffer[0] = 0x00;

	radio->buffer[1] = 0x55;
@@ -275,14 +250,11 @@ static int amradio_set_stereo(struct amradio_device *radio, char argument) 


	if (retval < 0 || size != BUFFER_LENGTH) {

		radio->stereo = -1;

		mutex_unlock(&radio->lock);

		return retval;

	}



	radio->stereo = 1;



	mutex_unlock(&radio->lock);



	return retval;

}
@@ -325,12 +297,18 @@ static int vidioc_g_tuner(struct file *file, void *priv, 
	struct amradio_device *radio = video_get_drvdata(video_devdata(file));

	int retval;



	mutex_lock(&radio->lock);



	/* safety check */

	if (radio->removed)

		return -EIO;

	if (radio->removed) {

		retval = -EIO;

		goto unlock;

	}



	if (v->index > 0)

		return -EINVAL;

	if (v->index > 0) {

		retval = -EINVAL;

		goto unlock;

	}



/* TODO: Add function which look is signal stereo or not

 * 	amradio_getstat(radio);
@@ -357,7 +335,10 @@ static int vidioc_g_tuner(struct file *file, void *priv, 
		v->audmode = V4L2_TUNER_MODE_MONO;

	v->signal = 0xffff;     /* Can't get the signal strength, sad.. */

	v->afc = 0; /* Don't know what is this */

	return 0;



unlock:

	mutex_unlock(&radio->lock);

	return retval;

}



/* vidioc_s_tuner - set tuner attributes */
@@ -367,12 +348,18 @@ static int vidioc_s_tuner(struct file *file, void *priv, 
	struct amradio_device *radio = video_get_drvdata(video_devdata(file));

	int retval;



	mutex_lock(&radio->lock);



	/* safety check */

	if (radio->removed)

		return -EIO;

	if (radio->removed) {

		retval = -EIO;

		goto unlock;

	}



	if (v->index > 0)

		return -EINVAL;

	if (v->index > 0) {

		retval = -EINVAL;

		goto unlock;

	}



	/* mono/stereo selector */

	switch (v->audmode) {
@@ -389,10 +376,12 @@ static int vidioc_s_tuner(struct file *file, void *priv, 
				"set stereo failed\n");

		break;

	default:

		return -EINVAL;

		retval = -EINVAL;

	}



	return 0;

unlock:

	mutex_unlock(&radio->lock);

	return retval;

}



/* vidioc_s_frequency - set tuner radio frequency */
@@ -402,19 +391,24 @@ static int vidioc_s_frequency(struct file *file, void *priv, 
	struct amradio_device *radio = video_get_drvdata(video_devdata(file));

	int retval;



	mutex_lock(&radio->lock);



	/* safety check */

	if (radio->removed)

		return -EIO;

	if (radio->removed) {

		retval = -EIO;

		goto unlock;

	}



	mutex_lock(&radio->lock);

	radio->curfreq = f->frequency;

	mutex_unlock(&radio->lock);



	retval = amradio_setfreq(radio, radio->curfreq);

	if (retval < 0)

		amradio_dev_warn(&radio->videodev->dev,

			"set frequency failed\n");

	return 0;



unlock:

	mutex_unlock(&radio->lock);

	return retval;

}



/* vidioc_g_frequency - get tuner radio frequency */
@@ -422,14 +416,22 @@ static int vidioc_g_frequency(struct file *file, void *priv, 
				struct v4l2_frequency *f)

{

	struct amradio_device *radio = video_get_drvdata(video_devdata(file));

	int retval = 0;



	mutex_lock(&radio->lock);



	/* safety check */

	if (radio->removed)

		return -EIO;

	if (radio->removed) {

		retval = -EIO;

		goto unlock;

	}



	f->type = V4L2_TUNER_RADIO;

	f->frequency = radio->curfreq;

	return 0;



unlock:

	mutex_unlock(&radio->lock);

	return retval;

}



/* vidioc_queryctrl - enumerate control items */
@@ -449,17 +451,26 @@ static int vidioc_g_ctrl(struct file *file, void *priv, 
				struct v4l2_control *ctrl)

{

	struct amradio_device *radio = video_get_drvdata(video_devdata(file));

	int retval = -EINVAL;



	mutex_lock(&radio->lock);



	/* safety check */

	if (radio->removed)

		return -EIO;

	if (radio->removed) {

		retval = -EIO;

		goto unlock;

	}



	switch (ctrl->id) {

	case V4L2_CID_AUDIO_MUTE:

		ctrl->value = radio->muted;

		return 0;

		retval = 0;

		break;

	}

	return -EINVAL;



unlock:

	mutex_unlock(&radio->lock);

	return retval;

}



/* vidioc_s_ctrl - set the value of a control */
@@ -467,11 +478,15 @@ static int vidioc_s_ctrl(struct file *file, void *priv, 
				struct v4l2_control *ctrl)

{

	struct amradio_device *radio = video_get_drvdata(video_devdata(file));

	int retval;

	int retval = -EINVAL;



	mutex_lock(&radio->lock);



	/* safety check */

	if (radio->removed)

		return -EIO;

	if (radio->removed) {

		retval = -EIO;

		goto unlock;

	}



	switch (ctrl->id) {

	case V4L2_CID_AUDIO_MUTE:
@@ -480,19 +495,20 @@ static int vidioc_s_ctrl(struct file *file, void *priv, 
			if (retval < 0) {

				amradio_dev_warn(&radio->videodev->dev,

					"amradio_stop failed\n");

				return -1;

			}

		} else {

			retval = amradio_set_mute(radio, AMRADIO_START);

			if (retval < 0) {

				amradio_dev_warn(&radio->videodev->dev,

					"amradio_start failed\n");

				return -1;

			}

		}

		return 0;

		break;

	}

	return -EINVAL;



unlock:

	mutex_unlock(&radio->lock);

	return retval;

}



/* vidioc_g_audio - get audio attributes */
@@ -535,9 +551,14 @@ static int vidioc_s_input(struct file *filp, void *priv, unsigned int i) 
static int usb_amradio_open(struct file *file)

{

	struct amradio_device *radio = video_get_drvdata(video_devdata(file));

	int retval;

	int retval = 0;



	mutex_lock(&radio->lock);



	lock_kernel();

	if (radio->removed) {

		retval = -EIO;

		goto unlock;

	}



	radio->users = 1;

	radio->muted = 1;
@@ -547,8 +568,7 @@ static int usb_amradio_open(struct file *file) 
		amradio_dev_warn(&radio->videodev->dev,

			"radio did not start up properly\n");

		radio->users = 0;

		unlock_kernel();

		return -EIO;

		goto unlock;

	}



	retval = amradio_set_stereo(radio, WANT_STEREO);
@@ -561,22 +581,25 @@ static int usb_amradio_open(struct file *file) 
		amradio_dev_warn(&radio->videodev->dev,

			"set frequency failed\n");



	unlock_kernel();

	return 0;

unlock:

	mutex_unlock(&radio->lock);

	return retval;

}



/*close device */

static int usb_amradio_close(struct file *file)

{

	struct amradio_device *radio = video_get_drvdata(video_devdata(file));

	int retval;



	if (!radio)

		return -ENODEV;

	int retval = 0;



	mutex_lock(&radio->lock);



	if (radio->removed) {

		retval = -EIO;

		goto unlock;

	}



	radio->users = 0;

	mutex_unlock(&radio->lock);



	if (!radio->removed) {

		retval = amradio_set_mute(radio, AMRADIO_STOP);
@@ -585,7 +608,9 @@ static int usb_amradio_close(struct file *file) 
				"amradio_stop failed\n");

	}



	return 0;

unlock:

	mutex_unlock(&radio->lock);

	return retval;

}



/* Suspend device - stop device. Need to be checked and fixed */
@@ -594,12 +619,15 @@ static int usb_amradio_suspend(struct usb_interface *intf, pm_message_t message) 
	struct amradio_device *radio = usb_get_intfdata(intf);

	int retval;



	mutex_lock(&radio->lock);



	retval = amradio_set_mute(radio, AMRADIO_STOP);

	if (retval < 0)

		dev_warn(&intf->dev, "amradio_stop failed\n");



	dev_info(&intf->dev, "going into suspend..\n");



	mutex_unlock(&radio->lock);

	return 0;

}
@@ -609,12 +637,15 @@ static int usb_amradio_resume(struct usb_interface *intf) 
	struct amradio_device *radio = usb_get_intfdata(intf);

	int retval;



	mutex_lock(&radio->lock);



	retval = amradio_set_mute(radio, AMRADIO_START);

	if (retval < 0)

		dev_warn(&intf->dev, "amradio_start failed\n");



	dev_info(&intf->dev, "coming out of suspend..\n");



	mutex_unlock(&radio->lock);

	return 0;

}