mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-09-21 20:22:13 +08:00
HID: hid-steam: Clean up locking
This cleans up the locking logic so that the spinlock is consistently used for access to a small handful of struct variables, and the mutex is exclusively and consistently used for ensuring that mutliple threads aren't trying to send/receive reports at the same time. Previously, only some report transactions were guarded by this mutex, potentially breaking atomicity. The mutex has been renamed to reflect this usage. Signed-off-by: Vicki Pfau <vi@endrift.com> Signed-off-by: Jiri Kosina <jkosina@suse.com>
This commit is contained in:
Vicki Pfau
Jiri Kosina
parent
917972636e
commit
691ead124a
@ -124,7 +124,7 @@ struct steam_device {
|
||||
struct list_head list;
|
||||
spinlock_t lock;
|
||||
struct hid_device *hdev, *client_hdev;
|
||||
struct mutex mutex;
|
||||
struct mutex report_mutex;
|
||||
bool client_opened;
|
||||
struct input_dev __rcu *input;
|
||||
unsigned long quirks;
|
||||
@ -267,21 +267,26 @@ static int steam_get_serial(struct steam_device *steam)
|
||||
* Send: 0xae 0x15 0x01
|
||||
* Recv: 0xae 0x15 0x01 serialnumber (10 chars)
|
||||
*/
|
||||
int ret;
|
||||
int ret = 0;
|
||||
u8 cmd[] = {STEAM_CMD_GET_SERIAL, 0x15, 0x01};
|
||||
u8 reply[3 + STEAM_SERIAL_LEN + 1];
|
||||
|
||||
mutex_lock(&steam->report_mutex);
|
||||
ret = steam_send_report(steam, cmd, sizeof(cmd));
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
goto out;
|
||||
ret = steam_recv_report(steam, reply, sizeof(reply));
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
if (reply[0] != 0xae || reply[1] != 0x15 || reply[2] != 0x01)
|
||||
return -EIO;
|
||||
goto out;
|
||||
if (reply[0] != 0xae || reply[1] != 0x15 || reply[2] != 0x01) {
|
||||
ret = -EIO;
|
||||
goto out;
|
||||
}
|
||||
reply[3 + STEAM_SERIAL_LEN] = 0;
|
||||
strscpy(steam->serial_no, reply + 3, sizeof(steam->serial_no));
|
||||
return 0;
|
||||
out:
|
||||
mutex_unlock(&steam->report_mutex);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
@ -291,13 +296,18 @@ static int steam_get_serial(struct steam_device *steam)
|
||||
*/
|
||||
static inline int steam_request_conn_status(struct steam_device *steam)
|
||||
{
|
||||
return steam_send_report_byte(steam, STEAM_CMD_REQUEST_COMM_STATUS);
|
||||
int ret;
|
||||
mutex_lock(&steam->report_mutex);
|
||||
ret = steam_send_report_byte(steam, STEAM_CMD_REQUEST_COMM_STATUS);
|
||||
mutex_unlock(&steam->report_mutex);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int steam_haptic_rumble(struct steam_device *steam,
|
||||
u16 intensity, u16 left_speed, u16 right_speed,
|
||||
u8 left_gain, u8 right_gain)
|
||||
{
|
||||
int ret;
|
||||
u8 report[11] = {STEAM_CMD_HAPTIC_RUMBLE, 9};
|
||||
|
||||
report[3] = intensity & 0xFF;
|
||||
@ -309,7 +319,10 @@ static inline int steam_haptic_rumble(struct steam_device *steam,
|
||||
report[9] = left_gain;
|
||||
report[10] = right_gain;
|
||||
|
||||
return steam_send_report(steam, report, sizeof(report));
|
||||
mutex_lock(&steam->report_mutex);
|
||||
ret = steam_send_report(steam, report, sizeof(report));
|
||||
mutex_unlock(&steam->report_mutex);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void steam_haptic_rumble_cb(struct work_struct *work)
|
||||
@ -336,11 +349,14 @@ static int steam_play_effect(struct input_dev *dev, void *data,
|
||||
static void steam_set_lizard_mode(struct steam_device *steam, bool enable)
|
||||
{
|
||||
if (enable) {
|
||||
mutex_lock(&steam->report_mutex);
|
||||
/* enable esc, enter, cursors */
|
||||
steam_send_report_byte(steam, STEAM_CMD_DEFAULT_MAPPINGS);
|
||||
/* enable mouse */
|
||||
steam_send_report_byte(steam, STEAM_CMD_DEFAULT_MOUSE);
|
||||
mutex_unlock(&steam->report_mutex);
|
||||
} else {
|
||||
mutex_lock(&steam->report_mutex);
|
||||
/* disable esc, enter, cursor */
|
||||
steam_send_report_byte(steam, STEAM_CMD_CLEAR_MAPPINGS);
|
||||
|
||||
@ -352,11 +368,13 @@ static void steam_set_lizard_mode(struct steam_device *steam, bool enable)
|
||||
STEAM_REG_RPAD_CLICK_PRESSURE, 0xFFFF, /* disable clicky pad */
|
||||
STEAM_REG_WATCHDOG_ENABLE, 0, /* disable watchdog that tests if Steam is active */
|
||||
0);
|
||||
mutex_unlock(&steam->report_mutex);
|
||||
} else {
|
||||
steam_write_registers(steam,
|
||||
STEAM_REG_LPAD_MODE, 0x07, /* disable mouse */
|
||||
STEAM_REG_RPAD_MODE, 0x07, /* disable mouse */
|
||||
0);
|
||||
mutex_unlock(&steam->report_mutex);
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -364,22 +382,29 @@ static void steam_set_lizard_mode(struct steam_device *steam, bool enable)
|
||||
static int steam_input_open(struct input_dev *dev)
|
||||
{
|
||||
struct steam_device *steam = input_get_drvdata(dev);
|
||||
unsigned long flags;
|
||||
bool set_lizard_mode;
|
||||
|
||||
mutex_lock(&steam->mutex);
|
||||
if (!steam->client_opened && lizard_mode)
|
||||
spin_lock_irqsave(&steam->lock, flags);
|
||||
set_lizard_mode = !steam->client_opened && lizard_mode;
|
||||
spin_unlock_irqrestore(&steam->lock, flags);
|
||||
if (set_lizard_mode)
|
||||
steam_set_lizard_mode(steam, false);
|
||||
mutex_unlock(&steam->mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void steam_input_close(struct input_dev *dev)
|
||||
{
|
||||
struct steam_device *steam = input_get_drvdata(dev);
|
||||
unsigned long flags;
|
||||
bool set_lizard_mode;
|
||||
|
||||
mutex_lock(&steam->mutex);
|
||||
if (!steam->client_opened && lizard_mode)
|
||||
spin_lock_irqsave(&steam->lock, flags);
|
||||
set_lizard_mode = !steam->client_opened && lizard_mode;
|
||||
spin_unlock_irqrestore(&steam->lock, flags);
|
||||
if (set_lizard_mode)
|
||||
steam_set_lizard_mode(steam, true);
|
||||
mutex_unlock(&steam->mutex);
|
||||
}
|
||||
|
||||
static enum power_supply_property steam_battery_props[] = {
|
||||
@ -624,6 +649,7 @@ static int steam_register(struct steam_device *steam)
|
||||
{
|
||||
int ret;
|
||||
bool client_opened;
|
||||
unsigned long flags;
|
||||
|
||||
/*
|
||||
* This function can be called several times in a row with the
|
||||
@ -636,11 +662,9 @@ static int steam_register(struct steam_device *steam)
|
||||
* Unlikely, but getting the serial could fail, and it is not so
|
||||
* important, so make up a serial number and go on.
|
||||
*/
|
||||
mutex_lock(&steam->mutex);
|
||||
if (steam_get_serial(steam) < 0)
|
||||
strscpy(steam->serial_no, "XXXXXXXXXX",
|
||||
sizeof(steam->serial_no));
|
||||
mutex_unlock(&steam->mutex);
|
||||
|
||||
hid_info(steam->hdev, "Steam Controller '%s' connected",
|
||||
steam->serial_no);
|
||||
@ -655,15 +679,13 @@ static int steam_register(struct steam_device *steam)
|
||||
mutex_unlock(&steam_devices_lock);
|
||||
}
|
||||
|
||||
mutex_lock(&steam->mutex);
|
||||
spin_lock_irqsave(&steam->lock, flags);
|
||||
client_opened = steam->client_opened;
|
||||
if (!client_opened)
|
||||
spin_unlock_irqrestore(&steam->lock, flags);
|
||||
if (!client_opened) {
|
||||
steam_set_lizard_mode(steam, lizard_mode);
|
||||
mutex_unlock(&steam->mutex);
|
||||
|
||||
if (!client_opened)
|
||||
ret = steam_input_register(steam);
|
||||
else
|
||||
} else
|
||||
ret = 0;
|
||||
|
||||
return ret;
|
||||
@ -746,10 +768,11 @@ static void steam_client_ll_stop(struct hid_device *hdev)
|
||||
static int steam_client_ll_open(struct hid_device *hdev)
|
||||
{
|
||||
struct steam_device *steam = hdev->driver_data;
|
||||
unsigned long flags;
|
||||
|
||||
mutex_lock(&steam->mutex);
|
||||
spin_lock_irqsave(&steam->lock, flags);
|
||||
steam->client_opened = true;
|
||||
mutex_unlock(&steam->mutex);
|
||||
spin_unlock_irqrestore(&steam->lock, flags);
|
||||
|
||||
steam_input_unregister(steam);
|
||||
|
||||
@ -764,17 +787,14 @@ static void steam_client_ll_close(struct hid_device *hdev)
|
||||
bool connected;
|
||||
|
||||
spin_lock_irqsave(&steam->lock, flags);
|
||||
connected = steam->connected;
|
||||
steam->client_opened = false;
|
||||
connected = steam->connected && !steam->client_opened;
|
||||
spin_unlock_irqrestore(&steam->lock, flags);
|
||||
|
||||
mutex_lock(&steam->mutex);
|
||||
steam->client_opened = false;
|
||||
if (connected)
|
||||
if (connected) {
|
||||
steam_set_lizard_mode(steam, lizard_mode);
|
||||
mutex_unlock(&steam->mutex);
|
||||
|
||||
if (connected)
|
||||
steam_input_register(steam);
|
||||
}
|
||||
}
|
||||
|
||||
static int steam_client_ll_raw_request(struct hid_device *hdev,
|
||||
@ -860,19 +880,12 @@ static int steam_probe(struct hid_device *hdev,
|
||||
steam->hdev = hdev;
|
||||
hid_set_drvdata(hdev, steam);
|
||||
spin_lock_init(&steam->lock);
|
||||
mutex_init(&steam->mutex);
|
||||
mutex_init(&steam->report_mutex);
|
||||
steam->quirks = id->driver_data;
|
||||
INIT_WORK(&steam->work_connect, steam_work_connect_cb);
|
||||
INIT_LIST_HEAD(&steam->list);
|
||||
INIT_WORK(&steam->rumble_work, steam_haptic_rumble_cb);
|
||||
|
||||
steam->client_hdev = steam_create_client_hid(hdev);
|
||||
if (IS_ERR(steam->client_hdev)) {
|
||||
ret = PTR_ERR(steam->client_hdev);
|
||||
goto client_hdev_fail;
|
||||
}
|
||||
steam->client_hdev->driver_data = steam;
|
||||
|
||||
/*
|
||||
* With the real steam controller interface, do not connect hidraw.
|
||||
* Instead, create the client_hid and connect that.
|
||||
@ -881,10 +894,6 @@ static int steam_probe(struct hid_device *hdev,
|
||||
if (ret)
|
||||
goto hid_hw_start_fail;
|
||||
|
||||
ret = hid_add_device(steam->client_hdev);
|
||||
if (ret)
|
||||
goto client_hdev_add_fail;
|
||||
|
||||
ret = hid_hw_open(hdev);
|
||||
if (ret) {
|
||||
hid_err(hdev,
|
||||
@ -910,15 +919,26 @@ static int steam_probe(struct hid_device *hdev,
|
||||
}
|
||||
}
|
||||
|
||||
steam->client_hdev = steam_create_client_hid(hdev);
|
||||
if (IS_ERR(steam->client_hdev)) {
|
||||
ret = PTR_ERR(steam->client_hdev);
|
||||
goto client_hdev_fail;
|
||||
}
|
||||
steam->client_hdev->driver_data = steam;
|
||||
|
||||
ret = hid_add_device(steam->client_hdev);
|
||||
if (ret)
|
||||
goto client_hdev_add_fail;
|
||||
|
||||
return 0;
|
||||
|
||||
input_register_fail:
|
||||
hid_hw_open_fail:
|
||||
client_hdev_add_fail:
|
||||
hid_hw_stop(hdev);
|
||||
hid_hw_start_fail:
|
||||
hid_destroy_device(steam->client_hdev);
|
||||
client_hdev_fail:
|
||||
hid_destroy_device(steam->client_hdev);
|
||||
input_register_fail:
|
||||
hid_hw_open_fail:
|
||||
hid_hw_start_fail:
|
||||
cancel_work_sync(&steam->work_connect);
|
||||
cancel_work_sync(&steam->rumble_work);
|
||||
steam_alloc_fail:
|
||||
@ -936,12 +956,10 @@ static void steam_remove(struct hid_device *hdev)
|
||||
return;
|
||||
}
|
||||
|
||||
cancel_work_sync(&steam->work_connect);
|
||||
hid_destroy_device(steam->client_hdev);
|
||||
mutex_lock(&steam->mutex);
|
||||
steam->client_hdev = NULL;
|
||||
steam->client_opened = false;
|
||||
mutex_unlock(&steam->mutex);
|
||||
cancel_work_sync(&steam->work_connect);
|
||||
if (steam->quirks & STEAM_QUIRK_WIRELESS) {
|
||||
hid_info(hdev, "Steam wireless receiver disconnected");
|
||||
}
|
||||
@ -1408,10 +1426,8 @@ static int steam_param_set_lizard_mode(const char *val,
|
||||
|
||||
mutex_lock(&steam_devices_lock);
|
||||
list_for_each_entry(steam, &steam_devices, list) {
|
||||
mutex_lock(&steam->mutex);
|
||||
if (!steam->client_opened)
|
||||
steam_set_lizard_mode(steam, lizard_mode);
|
||||
mutex_unlock(&steam->mutex);
|
||||
}
|
||||
mutex_unlock(&steam_devices_lock);
|
||||
return 0;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user