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Staging: generic_serial: fix double locking bug

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spin_lock_irqsave() is not nestable.  The second time that it gets
called it overwrites the "flags" variable and so IRQs can't be restored
properly.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Dan Carpenter 2011-02-28 22:28:31 +03:00 committed by Greg Kroah-Hartman
parent 2c590f3ca9
commit c976cc3aa9
1 changed files with 2 additions and 2 deletions
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4
drivers/staging/generic_serial/generic_serial.c
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@ -566,9 +566,9 @@ void gs_close(struct tty_struct * tty, struct file * filp)
* line status register.
*/
spin_lock_irqsave(&port->driver_lock, flags);
spin_lock(&port->driver_lock);
port->rd->disable_rx_interrupts (port);
spin_unlock_irqrestore(&port->driver_lock, flags);
spin_unlock(&port->driver_lock);
spin_unlock_irqrestore(&port->port.lock, flags);
/* close has no way of returning "EINTR", so discard return value */