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Input: uinput - support injecting multiple events in one write() call 

Rework the code in uinput_inject_event so that it matches the code in
evdev_write and allows injecting more than one event, or zero events.

Signed-off-by: Ryan Mallon <rmallon@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Ryan Mallon 2013-09-18 12:40:47 -07:00 committed by Dmitry Torokhov
parent 8474caddcc
commit cbf0541374
1 changed files with 18 additions and 8 deletions
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26
drivers/input/misc/uinput.c
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@ -430,20 +430,30 @@ static int uinput_setup_device(struct uinput_device *udev,
return retval;
}
static ssize_t uinput_inject_event(struct uinput_device *udev,
const char __user *buffer, size_t count)
static ssize_t uinput_inject_events(struct uinput_device *udev,
const char __user *buffer, size_t count)
{
struct input_event ev;
size_t bytes = 0;
if (count < input_event_size())
if (count != 0 && count < input_event_size())
return -EINVAL;
if (input_event_from_user(buffer, &ev))
return -EFAULT;
while (bytes + input_event_size() <= count) {
/*
* Note that even if some events were fetched successfully
* we are still going to return EFAULT instead of partial
* count to let userspace know that it got it's buffers
* all wrong.
*/
if (input_event_from_user(buffer + bytes, &ev))
return -EFAULT;
input_event(udev->dev, ev.type, ev.code, ev.value);
input_event(udev->dev, ev.type, ev.code, ev.value);
bytes += input_event_size();
}
return input_event_size();
return bytes;
}
static ssize_t uinput_write(struct file *file, const char __user *buffer,
@ -460,7 +470,7 @@ static ssize_t uinput_write(struct file *file, const char __user *buffer,
return retval;
retval = udev->state == UIST_CREATED ?
uinput_inject_event(udev, buffer, count) :
uinput_inject_events(udev, buffer, count) :
uinput_setup_device(udev, buffer, count);
mutex_unlock(&udev->mutex);