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ACPI: thinkpad-acpi: add mutex-based locking to input device event send path

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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>
This commit is contained in:
Henrique de Moraes Holschuh 2007-09-23 11:39:01 -03:00 committed by Len Brown
parent f4e1e43c60
commit 8523ed6fb2
1 changed files with 10 additions and 0 deletions
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10
drivers/misc/thinkpad_acpi.c
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@ -519,6 +519,7 @@ static char *next_cmd(char **cmds)
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 @@ static void tpacpi_input_send_key(unsigned int scancode,
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 @@ static void tpacpi_input_send_key(unsigned int scancode,
input_event(tpacpi_inputdev, EV_MSC, MSC_SCAN,
scancode);
input_sync(tpacpi_inputdev);
mutex_unlock(&tpacpi_inputdev_send_mutex);
}
}
@ -1149,11 +1154,15 @@ static void tpacpi_input_send_radiosw(void)
{
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 @@ static int __init thinkpad_acpi_module_init(void)
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");