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iio: fix: Keep a reference to the IIO device for open file descriptors

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Make sure that the IIO device is not freed while we still have file descriptors
for it.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Lars-Peter Clausen 2013-09-18 21:02:00 +01:00 committed by Jonathan Cameron
parent a87c82e454
commit cadc2125e1
2 changed files with 17 additions and 5 deletions
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4
drivers/iio/industrialio-core.c
View file

@ -970,6 +970,8 @@ static int iio_chrdev_open(struct inode *inode, struct file *filp)
if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
return -EBUSY;
iio_device_get(indio_dev);
filp->private_data = indio_dev;
return 0;
@ -983,6 +985,8 @@ static int iio_chrdev_release(struct inode *inode, struct file *filp)
struct iio_dev *indio_dev = container_of(inode->i_cdev,
struct iio_dev, chrdev);
clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
iio_device_put(indio_dev);
return 0;
}

18
drivers/iio/industrialio-event.c
View file

@ -72,7 +72,8 @@ EXPORT_SYMBOL(iio_push_event);
static unsigned int iio_event_poll(struct file *filep,
struct poll_table_struct *wait)
{
struct iio_event_interface *ev_int = filep->private_data;
struct iio_dev *indio_dev = filep->private_data;
struct iio_event_interface *ev_int = indio_dev->event_interface;
unsigned int events = 0;
poll_wait(filep, &ev_int->wait, wait);
@ -90,7 +91,8 @@ static ssize_t iio_event_chrdev_read(struct file *filep,
size_t count,
loff_t *f_ps)
{
struct iio_event_interface *ev_int = filep->private_data;
struct iio_dev *indio_dev = filep->private_data;
struct iio_event_interface *ev_int = indio_dev->event_interface;
unsigned int copied;
int ret;
@ -121,7 +123,8 @@ static ssize_t iio_event_chrdev_read(struct file *filep,
static int iio_event_chrdev_release(struct inode *inode, struct file *filep)
{
struct iio_event_interface *ev_int = filep->private_data;
struct iio_dev *indio_dev = filep->private_data;
struct iio_event_interface *ev_int = indio_dev->event_interface;
spin_lock_irq(&ev_int->wait.lock);
__clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
@ -133,6 +136,8 @@ static int iio_event_chrdev_release(struct inode *inode, struct file *filep)
kfifo_reset_out(&ev_int->det_events);
spin_unlock_irq(&ev_int->wait.lock);
iio_device_put(indio_dev);
return 0;
}
@ -158,12 +163,15 @@ int iio_event_getfd(struct iio_dev *indio_dev)
return -EBUSY;
}
spin_unlock_irq(&ev_int->wait.lock);
fd = anon_inode_getfd("iio:event",
&iio_event_chrdev_fileops, ev_int, O_RDONLY);
iio_device_get(indio_dev);
fd = anon_inode_getfd("iio:event", &iio_event_chrdev_fileops,
indio_dev, O_RDONLY);
if (fd < 0) {
spin_lock_irq(&ev_int->wait.lock);
__clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
spin_unlock_irq(&ev_int->wait.lock);
iio_device_put(indio_dev);
}
return fd;
}