HID: steam: fix deadlock with input devices.
When using this driver with the wireless dongle and some usermode program that monitors every input device (acpid, for example), while another usermode client opens and closes the low-level device repeadedly, the system eventually deadlocks. The reason is that steam_input_register_device() must not be called with the mutex held, because the input subsystem has its own synchronization that clashes with this one: it is possible that steam_input_open() is called before input_register_device() returns, and since steam_input_open() needs to lock the mutex, it deadlocks. However we must hold the mutex when calling any function that sends commands to the controller. If not, random commands end up falling fail. Reported-by: Simon Gene Gottlieb <simon@gottliebtfreitag.de> Signed-off-by: Rodrigo Rivas Costa <rodrigorivascosta@gmail.com> Tested-by: Simon Gene Gottlieb <simon@gottliebtfreitag.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
parent
1cbbd85fbc
commit
6b538cc213
|
@ -499,6 +499,7 @@ static void steam_battery_unregister(struct steam_device *steam)
|
|||
static int steam_register(struct steam_device *steam)
|
||||
{
|
||||
int ret;
|
||||
bool client_opened;
|
||||
|
||||
/*
|
||||
* This function can be called several times in a row with the
|
||||
|
@ -511,9 +512,11 @@ 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)
|
||||
strlcpy(steam->serial_no, "XXXXXXXXXX",
|
||||
sizeof(steam->serial_no));
|
||||
mutex_unlock(&steam->mutex);
|
||||
|
||||
hid_info(steam->hdev, "Steam Controller '%s' connected",
|
||||
steam->serial_no);
|
||||
|
@ -528,14 +531,16 @@ static int steam_register(struct steam_device *steam)
|
|||
}
|
||||
|
||||
mutex_lock(&steam->mutex);
|
||||
if (!steam->client_opened) {
|
||||
client_opened = steam->client_opened;
|
||||
if (!client_opened)
|
||||
steam_set_lizard_mode(steam, lizard_mode);
|
||||
ret = steam_input_register(steam);
|
||||
} else {
|
||||
ret = 0;
|
||||
}
|
||||
mutex_unlock(&steam->mutex);
|
||||
|
||||
if (!client_opened)
|
||||
ret = steam_input_register(steam);
|
||||
else
|
||||
ret = 0;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
@ -630,14 +635,21 @@ static void steam_client_ll_close(struct hid_device *hdev)
|
|||
{
|
||||
struct steam_device *steam = hdev->driver_data;
|
||||
|
||||
unsigned long flags;
|
||||
bool connected;
|
||||
|
||||
spin_lock_irqsave(&steam->lock, flags);
|
||||
connected = steam->connected;
|
||||
spin_unlock_irqrestore(&steam->lock, flags);
|
||||
|
||||
mutex_lock(&steam->mutex);
|
||||
steam->client_opened = false;
|
||||
if (connected)
|
||||
steam_set_lizard_mode(steam, lizard_mode);
|
||||
mutex_unlock(&steam->mutex);
|
||||
|
||||
if (steam->connected) {
|
||||
steam_set_lizard_mode(steam, lizard_mode);
|
||||
if (connected)
|
||||
steam_input_register(steam);
|
||||
}
|
||||
}
|
||||
|
||||
static int steam_client_ll_raw_request(struct hid_device *hdev,
|
||||
|
|
Loading…
Reference in a new issue