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Input: sparse-keymap - implement safer freeing of the keymap

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Allow calling sparse_keymap_free() before unregistering input device
whithout risk of racing with EVIOCGETKEYCODE and EVIOCSETKEYCODE.
This makes life of drivers writers easier.

Acked-by: Yong Wang <yong.y.wang@intel.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2010-03-21 22:56:15 -07:00
parent 13bad37b04
commit 2e2e3b96d9
2 changed files with 40 additions and 19 deletions
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9
drivers/input/input.c
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@ -659,7 +659,14 @@ static int input_default_setkeycode(struct input_dev *dev,
int input_get_keycode(struct input_dev *dev,
unsigned int scancode, unsigned int *keycode)
{
return dev->getkeycode(dev, scancode, keycode);
unsigned long flags;
int retval;
spin_lock_irqsave(&dev->event_lock, flags);
retval = dev->getkeycode(dev, scancode, keycode);
spin_unlock_irqrestore(&dev->event_lock, flags);
return retval;
}
EXPORT_SYMBOL(input_get_keycode);