ACPI: thinkpad-acpi: add mutex-based locking to input device event send path
Protect the input device event sending path with a mutex, since hot key
input events are not atomic and require an cohesive event block to be sent
together.
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 8aa0f96..0ced9d6 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -519,6 +519,7 @@
static struct platform_device *tpacpi_pdev;
static struct class_device *tpacpi_hwmon;
static struct input_dev *tpacpi_inputdev;
+static struct mutex tpacpi_inputdev_send_mutex;
static int tpacpi_resume_handler(struct platform_device *pdev)
@@ -1131,6 +1132,8 @@
unsigned int keycode)
{
if (keycode != KEY_RESERVED) {
+ mutex_lock(&tpacpi_inputdev_send_mutex);
+
input_report_key(tpacpi_inputdev, keycode, 1);
if (keycode == KEY_UNKNOWN)
input_event(tpacpi_inputdev, EV_MSC, MSC_SCAN,
@@ -1142,6 +1145,8 @@
input_event(tpacpi_inputdev, EV_MSC, MSC_SCAN,
scancode);
input_sync(tpacpi_inputdev);
+
+ mutex_unlock(&tpacpi_inputdev_send_mutex);
}
}
@@ -1149,11 +1154,15 @@
{
int wlsw;
+ mutex_lock(&tpacpi_inputdev_send_mutex);
+
if (tp_features.hotkey_wlsw && !hotkey_get_wlsw(&wlsw)) {
input_report_switch(tpacpi_inputdev,
SW_RADIO, !!wlsw);
input_sync(tpacpi_inputdev);
}
+
+ mutex_unlock(&tpacpi_inputdev_send_mutex);
}
static void hotkey_notify(struct ibm_struct *ibm, u32 event)
@@ -4737,6 +4746,7 @@
thinkpad_acpi_module_exit();
return ret;
}
+ mutex_init(&tpacpi_inputdev_send_mutex);
tpacpi_inputdev = input_allocate_device();
if (!tpacpi_inputdev) {
printk(IBM_ERR "unable to allocate input device\n");