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tty: Fix double grabbing of a spinlock

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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>
This commit is contained in:
Denis Joseph Barrow 2009-01-15 13:31:24 +00:00 committed by Linus Torvalds
parent fe41cbb164
commit d45eb81c3e
1 changed files with 1 additions and 2 deletions
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3
drivers/net/usb/hso.c
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@ -2044,9 +2044,8 @@ static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial)
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) {