[PATCH] sound: usb: get lock before calling usb_enable_autosuspend()

[Salah Triki]

Based on the documentation of usb_enable_autosuspend(), the
caller must hold udev's device lock.

Signed-off-by: Salah Triki <salah.triki at gmail.com>
---
 sound/usb/card.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/sound/usb/card.c b/sound/usb/card.c
index 2f6a62416c05..9290ba0acd5f 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -907,8 +907,13 @@ static void usb_audio_disconnect(struct usb_interface *intf)
 		}
 	}
 
-	if (chip->quirk_type & QUIRK_SETUP_DISABLE_AUTOSUSPEND)
-		usb_enable_autosuspend(interface_to_usbdev(intf));
+	if (chip->quirk_type & QUIRK_SETUP_DISABLE_AUTOSUSPEND) {
+		struct usb_device *udev = interface_to_usbdev(intf);
+
+		usb_lock_device(udev);
+		usb_enable_autosuspend(udev);
+		usb_unlock_device(udev);
+	}
 
 	chip->num_interfaces--;
 	if (chip->num_interfaces <= 0) {
-- 
2.25.1