linux-kernel - [BUG] ali-ircc.c sleeping function called from invalid context

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Date:	Thu, 8 Oct 2009 12:22:29 +0000
From:	Alexander Strakh <strakh@...ras.ru>
To:	Benjamin Kong <benjamin_kong@....com.tw>,
	Samuel Ortiz <samuel@...tiz.org>,
	rda-users@...ts.sourceforge.net,
	Linux Kernlel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] ali-ircc.c sleeping function called from invalid context

	KERNEL_VERSION: 2.6.31
	DESCRIBE:
Driver reports/drivers/net/irda/ali-ircc.c might sleep in attomic context, 
because it calls ali_ircc_change_speed after spin_lock_irqsave:

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 might_sleep macro 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

Found by: Linux Driver Verification

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