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>
diff --git a/drivers/macintosh/mac_hid.c b/drivers/macintosh/mac_hid.c
index 067f996..6a82388 100644
--- a/drivers/macintosh/mac_hid.c
+++ b/drivers/macintosh/mac_hid.c
@@ -23,6 +23,8 @@
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 @@
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 @@
if (rc)
*valp = old_val;
+ mutex_unlock(&mac_hid_emumouse_mutex);
+
return rc;
}
