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net/irda: Hold port lock while bumping blocked_open 

Although tty_lock() already protects concurrent update to
blocked_open, that fails to meet the separation-of-concerns between
tty_port and tty.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Peter Hurley 2013-03-05 06:09:05 +00:00 committed by David S. Miller
parent a4ed2e737c
commit 2f7c069b96
1 changed files with 2 additions and 2 deletions
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4
net/irda/ircomm/ircomm_tty.c
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@ -317,8 +317,8 @@ static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
spin_lock_irqsave(&port->lock, flags);
if (!tty_hung_up_p(filp))
port->count--;
spin_unlock_irqrestore(&port->lock, flags);
port->blocked_open++;
spin_unlock_irqrestore(&port->lock, flags);
while (1) {
if (tty->termios.c_cflag & CBAUD)
@ -362,8 +362,8 @@ static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
spin_lock_irqsave(&port->lock, flags);
if (!tty_hung_up_p(filp))
port->count++;
spin_unlock_irqrestore(&port->lock, flags);
port->blocked_open--;
spin_unlock_irqrestore(&port->lock, flags);
IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
__FILE__, __LINE__, tty->driver->name, port->count);