From 87abb6bbdbcfbced2ce0bcad68dd89ac3ff9464b Mon Sep 17 00:00:00 2001
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: Thu, 11 Nov 2010 22:03:59 -0800
Subject: [PATCH] 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>
---
drivers/macintosh/mac_hid.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/macintosh/mac_hid.c b/drivers/macintosh/mac_hid.c
index 067f9962f499..6a82388505f0 100644
--- a/drivers/macintosh/mac_hid.c
+++ b/drivers/macintosh/mac_hid.c
@@ -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;
}
--
GitLab