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Input: uinput - always report EPOLLOUT

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uinput device is always available for writing so we should always report
EPOLLOUT and EPOLLWRNORM bits, not only when there is nothing to read from
the device.

Fixes: d4b675e1b5 ("Input: uinput - fix returning EPOLLOUT from uinput_poll")
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20191209202254.GA107567@dtor-ws
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dmitry Torokhov 2019-12-13 14:03:56 -08:00
parent afbd65f5e7
commit add2180994
1 changed files with 3 additions and 2 deletions
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5
drivers/input/misc/uinput.c
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@ -689,13 +689,14 @@ static ssize_t uinput_read(struct file *file, char __user *buffer,
static __poll_t uinput_poll(struct file *file, poll_table *wait)
{
struct uinput_device *udev = file->private_data;
__poll_t mask = EPOLLOUT | EPOLLWRNORM; /* uinput is always writable */
poll_wait(file, &udev->waitq, wait);
if (udev->head != udev->tail)
return EPOLLIN | EPOLLRDNORM;
mask |= EPOLLIN | EPOLLRDNORM;
return EPOLLOUT | EPOLLWRNORM;
return mask;
}
static int uinput_release(struct inode *inode, struct file *file)