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Date: Tue, 19 Oct 2010 11:43:54 +0200 From: Julia Lawall <julia@...u.dk> To: linux-kernel@...r.kernel.org Cc: kernel-janitors@...r.kernel.org Subject: [PATCH 2/4] drivers/char/generic_serial.c: convert nested spin_lock_irqsave to spin_lock From: Julia Lawall <julia@...u.dk> If spin_lock_irqsave is called twice in a row with the same second argument, the interrupt state at the point of the second call overwrites the value saved by the first call. Indeed, the second call does not need to save the interrupt state, so it is changed to a simple spin_lock. The semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression lock1,lock2; expression flags; @@ *spin_lock_irqsave(lock1,flags) ... when != flags *spin_lock_irqsave(lock2,flags) // </smpl> Signed-off-by: Julia Lawall <julia@...u.dk> --- drivers/char/generic_serial.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/char/generic_serial.c b/drivers/char/generic_serial.c index 5954ee1..466988d 100644 --- a/drivers/char/generic_serial.c +++ b/drivers/char/generic_serial.c @@ -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 */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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