[PATCH] usb-serial: fix mos_parport refcount imbalance on error path

[Lin Yi <teroincn@xxxxxxx>]

write_parport_ref_nonblock increase mos_parport refcount without
decrease it when return -ENOMEM code, so need a decrement before function
return -ENOMEM.

Signed-off-by: Lin Yi <teroincn@xxxxxxx>
---
 drivers/usb/serial/mos7720.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
index fc52ac7..6abb335 100644
--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -371,12 +371,14 @@ static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
 	urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
 	if (!urbtrack->urb) {
 		kfree(urbtrack);
+		kref_put(&mos_parport->ref_count, destroy_mos_parport);
 		return -ENOMEM;
 	}
 	urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_ATOMIC);
 	if (!urbtrack->setup) {
 		usb_free_urb(urbtrack->urb);
 		kfree(urbtrack);
+		kref_put(&mos_parport->ref_count, destroy_mos_parport);
 		return -ENOMEM;
 	}
 	urbtrack->setup->bRequestType = (__u8)0x40;
-- 
1.9.1