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| author | Andrzej Pietrasiewicz <andrzej.p@collabora.com> | 2020-10-04 21:15:46 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2020-12-02 22:10:31 -0800 |
| commit | 39be39ceffd572baddfeff8b50aba931d3d6d785 (patch) | |
| tree | 3658d328a22b8627b91a08eb818b642b3de0d35c /drivers/input/input.c | |
| parent | c1b46cd4df97534c6b942bb30526a2c47f0cb3c8 (diff) | |
Input: add input_device_enabled()
A helper function for drivers to decide if the device is used or not.
A lockdep check is introduced as inspecting ->users should be done under
input device's mutex.
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Link: https://lore.kernel.org/r/20200608112211.12125-2-andrzej.p@collabora.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/input.c')
| -rw-r--r-- | drivers/input/input.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/input/input.c b/drivers/input/input.c index 3cfd2c18eebd..41377bfa142d 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -2127,6 +2127,14 @@ void input_enable_softrepeat(struct input_dev *dev, int delay, int period) } EXPORT_SYMBOL(input_enable_softrepeat); +bool input_device_enabled(struct input_dev *dev) +{ + lockdep_assert_held(&dev->mutex); + + return dev->users > 0; +} +EXPORT_SYMBOL_GPL(input_device_enabled); + /** * input_register_device - register device with input core * @dev: device to be registered |