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[media] au0828: fix race condition that causes xc5000 to not bind for digital 

In some cases users would see the xc5000_attach() call failing for the
digital side of the tuner on initialization.  This is because of udev
running v4l-id while the digital side of the board is still coming up.

This is the exact same race condition which was present in em28xx (not
surprising since I copied all the locking logic from that driver when I
added analog support).  Reproduce Mauro's fix from the em28xx driver in
au0828.

Reported-by: Rick Harding <rharding@mitechie.com>
Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Devin Heitmueller 2012-08-06 22:46:58 -03:00 committed by Mauro Carvalho Chehab
parent 0a3dabb15e
commit 549ee4df19
2 changed files with 13 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/media/video/au0828/au0828-core.c
View File

@ -205,6 +205,8 @@ static int au0828_usb_probe(struct usb_interface *interface,
return -ENOMEM;
}
mutex_init(&dev->lock);
mutex_lock(&dev->lock);
mutex_init(&dev->mutex);
mutex_init(&dev->dvb.lock);
dev->usbdev = usbdev;
@ -215,6 +217,7 @@ static int au0828_usb_probe(struct usb_interface *interface,
if (retval) {
printk(KERN_ERR "%s() v4l2_device_register failed\n",
__func__);
mutex_unlock(&dev->lock);
kfree(dev);
return -EIO;
}
@ -245,6 +248,8 @@ static int au0828_usb_probe(struct usb_interface *interface,
printk(KERN_INFO "Registered device AU0828 [%s]\n",
dev->board.name == NULL ? "Unset" : dev->board.name);
mutex_unlock(&dev->lock);
return 0;
}

21
drivers/media/video/au0828/au0828-video.c
View File

@ -864,17 +864,15 @@ static int res_get(struct au0828_fh *fh, unsigned int bit)
return 1;
/* is it free? */
mutex_lock(&dev->lock);
if (dev->resources & bit) {
/* no, someone else uses it */
mutex_unlock(&dev->lock);
return 0;
}
/* it's free, grab it */
fh->resources |= bit;
dev->resources |= bit;
dprintk(1, "res: get %d\n", bit);
mutex_unlock(&dev->lock);
return 1;
}
@ -894,11 +892,9 @@ static void res_free(struct au0828_fh *fh, unsigned int bits)
BUG_ON((fh->resources & bits) != bits);
mutex_lock(&dev->lock);
fh->resources &= ~bits;
dev->resources &= ~bits;
dprintk(1, "res: put %d\n", bits);
mutex_unlock(&dev->lock);
}
static int get_ressource(struct au0828_fh *fh)
@ -1023,7 +1019,8 @@ static int au0828_v4l2_open(struct file *filp)
NULL, &dev->slock,
V4L2_BUF_TYPE_VIDEO_CAPTURE,
V4L2_FIELD_INTERLACED,
sizeof(struct au0828_buffer), fh, NULL);
sizeof(struct au0828_buffer), fh,
&dev->lock);
/* VBI Setup */
dev->vbi_width = 720;
@ -1032,8 +1029,8 @@ static int au0828_v4l2_open(struct file *filp)
NULL, &dev->slock,
V4L2_BUF_TYPE_VBI_CAPTURE,
V4L2_FIELD_SEQ_TB,
sizeof(struct au0828_buffer), fh, NULL);
sizeof(struct au0828_buffer), fh,
&dev->lock);
return ret;
}
@ -1312,8 +1309,6 @@ static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
if (rc < 0)
return rc;
mutex_lock(&dev->lock);
if (videobuf_queue_is_busy(&fh->vb_vidq)) {
printk(KERN_INFO "%s queue busy\n", __func__);
rc = -EBUSY;
@ -1322,7 +1317,6 @@ static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
rc = au0828_set_format(dev, VIDIOC_S_FMT, f);
out:
mutex_unlock(&dev->lock);
return rc;
}
@ -1832,7 +1826,7 @@ static struct v4l2_file_operations au0828_v4l_fops = {
.read = au0828_v4l2_read,
.poll = au0828_v4l2_poll,
.mmap = au0828_v4l2_mmap,
.ioctl = video_ioctl2,
.unlocked_ioctl = video_ioctl2,
};
static const struct v4l2_ioctl_ops video_ioctl_ops = {
@ -1922,7 +1916,6 @@ int au0828_analog_register(struct au0828_dev *dev,
init_waitqueue_head(&dev->open);
spin_lock_init(&dev->slock);
mutex_init(&dev->lock);
/* init video dma queues */
INIT_LIST_HEAD(&dev->vidq.active);
@ -1963,11 +1956,13 @@ int au0828_analog_register(struct au0828_dev *dev,
/* Fill the video capture device struct */
*dev->vdev = au0828_video_template;
dev->vdev->parent = &dev->usbdev->dev;
dev->vdev->lock = &dev->lock;
strcpy(dev->vdev->name, "au0828a video");
/* Setup the VBI device */
*dev->vbi_dev = au0828_video_template;
dev->vbi_dev->parent = &dev->usbdev->dev;
dev->vbi_dev->lock = &dev->lock;
strcpy(dev->vbi_dev->name, "au0828a vbi");
/* Register the v4l2 device */