diff options
| -rw-r--r-- | drivers/staging/comedi/comedi_fops.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c index 1d6bef285821..fe25287c5688 100644 --- a/drivers/staging/comedi/comedi_fops.c +++ b/drivers/staging/comedi/comedi_fops.c @@ -2264,7 +2264,7 @@ static unsigned int comedi_poll(struct file *file, poll_table *wait) struct comedi_device *dev = cfp->dev; struct comedi_subdevice *s, *s_read; - mutex_lock(&dev->mutex); + down_read(&dev->attach_lock); if (!dev->attached) { dev_dbg(dev->class_dev, "no driver attached\n"); @@ -2294,7 +2294,7 @@ static unsigned int comedi_poll(struct file *file, poll_table *wait) } done: - mutex_unlock(&dev->mutex); + up_read(&dev->attach_lock); return mask; } |