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path: root/drivers/input/evdev.c
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Diffstat (limited to 'drivers/input/evdev.c')
-rw-r--r--drivers/input/evdev.c20
1 files changed, 11 insertions, 9 deletions
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 4cf25347b01..76457d50bc3 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -369,7 +369,7 @@ static int evdev_fetch_next_event(struct evdev_client *client,
spin_lock_irq(&client->buffer_lock);
- have_event = client->head != client->tail;
+ have_event = client->packet_head != client->tail;
if (have_event) {
*event = client->buffer[client->tail++];
client->tail &= client->bufsize - 1;
@@ -391,14 +391,13 @@ static ssize_t evdev_read(struct file *file, char __user *buffer,
if (count < input_event_size())
return -EINVAL;
- if (client->packet_head == client->tail && evdev->exist &&
- (file->f_flags & O_NONBLOCK))
- return -EAGAIN;
-
- retval = wait_event_interruptible(evdev->wait,
- client->packet_head != client->tail || !evdev->exist);
- if (retval)
- return retval;
+ if (!(file->f_flags & O_NONBLOCK)) {
+ retval = wait_event_interruptible(evdev->wait,
+ client->packet_head != client->tail ||
+ !evdev->exist);
+ if (retval)
+ return retval;
+ }
if (!evdev->exist)
return -ENODEV;
@@ -412,6 +411,9 @@ static ssize_t evdev_read(struct file *file, char __user *buffer,
retval += input_event_size();
}
+ if (retval == 0 && (file->f_flags & O_NONBLOCK))
+ return -EAGAIN;
+
return retval;
}