tty: Fix double grabbing of a spinlock
The HSO changes for kref introduced a recursive spinlock take. All
functions which call put_rxbuf_data already have serial->serial_lock
grabbed.
[Comment to code added-AC]
Signed-off-by: Denis Joseph Barrow <D.Barrow@option.com>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index 9df04dd..e25a58f 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -2044,9 +2044,8 @@
return -2;
}
- spin_lock(&serial->serial_lock);
+ /* All callers to put_rxbuf_data hold serial_lock */
tty = tty_kref_get(serial->tty);
- spin_unlock(&serial->serial_lock);
/* Push data to tty */
if (tty) {