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Input: evdev - try to wake up readers only if we have full packet 

We should only wake waiters on the event device when we actually post
an EV_SYN/SYN_REPORT to the queue. Otherwise we end up making waiting
threads runnable only to go right back to sleep because the device
still isn't readable.

Reported-by: Jeffrey Brown <jeffbrown@android.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2011-06-18 02:50:11 -07:00
parent 8c127f0717
commit da40b0b6b4
1 changed files with 2 additions and 1 deletions
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3
drivers/input/evdev.c
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@ -111,7 +111,8 @@ static void evdev_event(struct input_handle *handle,
rcu_read_unlock();
wake_up_interruptible(&evdev->wait);
if (type == EV_SYN && code == SYN_REPORT)
wake_up_interruptible(&evdev->wait);
}
static int evdev_fasync(int fd, struct file *file, int on)