From: Johan Hovold Date: Tue, 1 Oct 2019 08:49:07 +0000 (+0200) Subject: USB: serial: fix runtime PM after driver unbind X-Git-Tag: v4.9.197~31 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5f49cb483e692b532d8d84f6db9c1fe5a1834f47;p=platform%2Fkernel%2Flinux-amlogic.git USB: serial: fix runtime PM after driver unbind 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 Signed-off-by: Johan Hovold Link: https://lore.kernel.org/r/20191001084908.2003-4-johan@kernel.org Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index 4a037b4..a894c0f 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -315,10 +315,7 @@ static void serial_cleanup(struct tty_struct *tty) 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);