Input: dynamically allocate ABS information

As all callers are now changed to only use the input_abs_*() access
helpers, switching over to dynamically allocated ABS information is
easy. This reduces size of struct input_dev from 3152 to 1640 on
64 bit architectures.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 5 insertions, 16 deletions

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 9807c8ff6a84..08f48c03eec4 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -649,13 +649,7 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
                         if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
 
                                 t = _IOC_NR(cmd) & ABS_MAX;
-
-                                abs.value = input_abs_get_val(dev, t);
-                                abs.minimum = input_abs_get_min(dev, t);
-                                abs.maximum = input_abs_get_max(dev, t);
-                                abs.fuzz = input_abs_get_fuzz(dev, t);
-                                abs.flat = input_abs_get_flat(dev, t);
-                                abs.resolution = input_abs_get_res(dev, t);
+                                abs = dev->absinfo[t];
 
                                 if (copy_to_user(p, &abs, min_t(size_t,
                                                                 _IOC_SIZE(cmd),
@@ -691,6 +685,9 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
                                                                   sizeof(struct input_absinfo))))
                                         return -EFAULT;
 
+                                if (_IOC_SIZE(cmd) < sizeof(struct input_absinfo))
+                                        abs.resolution = 0;
+
                                 /* We can't change number of reserved MT slots */
                                 if (t == ABS_MT_SLOT)
                                         return -EINVAL;
@@ -701,15 +698,7 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
                                  * of event.
                                  */
                                 spin_lock_irq(&dev->event_lock);
-
-                                input_abs_set_val(dev, t, abs.value);
-                                input_abs_set_min(dev, t, abs.minimum);
-                                input_abs_set_max(dev, t, abs.maximum);
-                                input_abs_set_fuzz(dev, t, abs.fuzz);
-                                input_abs_set_flat(dev, t, abs.flat);
-                                input_abs_set_res(dev, t, _IOC_SIZE(cmd) < sizeof(struct input_absinfo) ?
-                                                                0 : abs.resolution);
-
+                                dev->absinfo[t] = abs;
                                 spin_unlock_irq(&dev->event_lock);
 
                                 return 0;