From: Johan Hovold johan@kernel.org
commit d51bdb93ca7e71d7fb30a572c7b47ed0194bf3fe upstream.
Since commit c2b71462d294 ("USB: core: Fix bug caused by duplicate interface PM usage counter") USB drivers must always balance their runtime PM gets and puts, including when the driver has already been unbound from the interface.
Leaving the interface with a positive PM usage counter would prevent a later bound driver from suspending the device.
Fixes: c2b71462d294 ("USB: core: Fix bug caused by duplicate interface PM usage counter") Cc: stable stable@vger.kernel.org Signed-off-by: Johan Hovold johan@kernel.org Link: https://lore.kernel.org/r/20191001084908.2003-4-johan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/serial/usb-serial.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-)
--- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -314,10 +314,7 @@ static void serial_cleanup(struct tty_st serial = port->serial; owner = serial->type->driver.owner;
- mutex_lock(&serial->disc_mutex); - if (!serial->disconnected) - usb_autopm_put_interface(serial->interface); - mutex_unlock(&serial->disc_mutex); + usb_autopm_put_interface(serial->interface);
usb_serial_put(serial); module_put(owner);