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Input: mac mouse emulation - add locking 

We need to add appropriate locking when toggling mac mouse emulation
on and off to ensure that input device and handler are in consistent
state.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2010-11-11 22:03:59 -08:00
parent a309cdc778
commit 87abb6bbdb
1 changed files with 8 additions and 0 deletions
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8
drivers/macintosh/mac_hid.c
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@ -23,6 +23,8 @@ static int mouse_button3_keycode = KEY_RIGHTALT; /* right option key */
static struct input_dev *mac_hid_emumouse_dev;
static DEFINE_MUTEX(mac_hid_emumouse_mutex);
static int mac_hid_create_emumouse(void)
{
static struct lock_class_key mac_hid_emumouse_dev_event_class;
@ -187,6 +189,10 @@ static int mac_hid_toggle_emumouse(ctl_table *table, int write,
int old_val = *valp;
int rc;
rc = mutex_lock_killable(&mac_hid_emumouse_mutex);
if (rc)
return rc;
rc = proc_dointvec(table, write, buffer, lenp, ppos);
if (rc == 0 && write && *valp != old_val) {
@ -202,6 +208,8 @@ static int mac_hid_toggle_emumouse(ctl_table *table, int write,
if (rc)
*valp = old_val;
mutex_unlock(&mac_hid_emumouse_mutex);
return rc;
}