From a046c1e866673dd334c31d06312283e2bc5b483b Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Tue, 3 Jan 2012 14:59:42 +0100 Subject: [PATCH] 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 --- drivers/staging/iio/industrialio-event.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/staging/iio/industrialio-event.c b/drivers/staging/iio/industrialio-event.c index 800f67d..66d320b 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; -- 2.7.4