From a046c1e866673dd334c31d06312283e2bc5b483b Mon Sep 17 00:00:00 2001
From: Lars-Peter Clausen <lars@metafoo.de>
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 <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
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 800f67d4cce15..66d320bf30205 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;
--
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