linux-kernel - [BUG] ali-ircc.c: get spin

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Date:	Wed, 14 Oct 2009 12:14:05 +0000
From:	iceberg <strakh@...ras.ru>
To:	Benjamin Kong <benjamin_kong@....com.tw>,
	Samuel Ortiz <samuel@...tiz.org>,
	rda-users@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: [BUG] ali-ircc.c: get spin_lock twice

	KERNEL_VERSION: 2.6.31
	DESCRIBE:
Driver reports/drivers/net/irda/ali-ircc.c  - get spin_lock twice

drivers/net/irda/ali-ircc.c:
2028static int ali_ircc_net_ioctl(struct net_device *dev, struct ifreq 
*rq, int cmd)

...
2056		spin_lock_irqsave(&self->lock, flags);
2057		ali_ircc_change_speed(self, irq->ifr_baudrate);
...

Path to second spin_lock_irqsave(&self->lock, flags) 
 from ali_ircc_change_speed:
1. ali_ircc_change_speed calls ali_ircc_sir_change_speed ./drivers/net/
irda/ali-ircc.c:999
2. ali_ircc_sir_change_speed calls spin_lock_irqsave at ./drivers/net/
irda/ali-ircc.c:1084:

1050static void ali_ircc_sir_change_speed(struct ali_ircc_cb *priv, 
__u32 speed)
1084        spin_lock_irqsave(&self->lock, flags);

Found by: Linux Driver Verification project

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