From: Lars-Peter Clausen Date: Tue, 3 Jan 2012 13:59:42 +0000 (+0100) Subject: staging:iio:events: Use non-atmoic bitops X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a046c1e866673dd334c31d06312283e2bc5b483b;p=linux-beck.git staging:iio:events: Use non-atmoic bitops We always hold the waitqueue lock when modifying the flags field. So it is safe to use the non-atomic bitops here instead of the atomic versions. The lock has to be held, because we need to clear the busy flag and flush the event FIFO in one atomic operation when closing the event file descriptor. Signed-off-by: Lars-Peter Clausen Acked-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/iio/industrialio-event.c b/drivers/staging/iio/industrialio-event.c index 800f67d4cce1..66d320bf3020 100644 --- a/drivers/staging/iio/industrialio-event.c +++ b/drivers/staging/iio/industrialio-event.c @@ -124,7 +124,7 @@ static int iio_event_chrdev_release(struct inode *inode, struct file *filep) struct iio_event_interface *ev_int = filep->private_data; spin_lock(&ev_int->wait.lock); - clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags); + __clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags); /* * In order to maintain a clean state for reopening, * clear out any awaiting events. The mask will prevent @@ -153,7 +153,7 @@ int iio_event_getfd(struct iio_dev *indio_dev) return -ENODEV; spin_lock(&ev_int->wait.lock); - if (test_and_set_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) { + if (__test_and_set_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) { spin_unlock(&ev_int->wait.lock); return -EBUSY; } @@ -162,7 +162,7 @@ int iio_event_getfd(struct iio_dev *indio_dev) &iio_event_chrdev_fileops, ev_int, O_RDONLY); if (fd < 0) { spin_lock(&ev_int->wait.lock); - clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags); + __clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags); spin_unlock(&ev_int->wait.lock); } return fd;