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

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Message-Id: <200910071715.14853.strakh@ispras.ru>
Date:	Wed, 7 Oct 2009 17:15:14 +0000
From:	Alexander Strakh <strakh@...ras.ru>
To:	Jiri Slaby <jirislaby@...il.com>,
	Linux Kernlel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] isicom.c sleeping function called from invalid context

	KERNEL_VERSION: 2.6.31
	DESCRIBE:
Driver drivers/char/isicom.c might sleep in atomic  context, because it calls 
tty_port_xmit_buf under spin_lock.

./drivers/char/isicom.c:
1307 static void isicom_hangup(struct tty_struct *tty)
1308 {
...
1315         spin_lock_irqsave(&port->card->card_lock, flags);
1316         isicom_shutdown_port(port);
...

Path to might_sleep macro from isicom_hangup:
1. isicom_hangup calls spin_lock_irqsave (drivers/char/isicom.c:1315) and then 
calls isicom_shutdown_port.
2. isiscom_shutdown_port calls tty_port_free_xmit_buf at 
drivers/char/isicom.c:906
3. tty_port_free_xmit_buf calls mutex_lock at srivers/char/tty_port:48

Found by Linux Driver Verification Project.
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