linux-kernel - Re: [PATCHv2 1/2] tty: serial: men_z135_uart.c: Fix race between IRQ and set

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Message-ID: <55C3450E.8070107@hurleysoftware.com>
Date:	Thu, 06 Aug 2015 07:29:18 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Johannes Thumshirn <jthumshirn@...e.de>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Andreas Werner <andreas.werner@....de>
Subject: Re: [PATCHv2 1/2] tty: serial: men_z135_uart.c: Fix race between
 IRQ and set_termios()

On 08/06/2015 03:16 AM, Johannes Thumshirn wrote:
> Fix panic caused by a race between men_z135_intr() and men_z135_set_termios().
> 
> men_z135_intr() and men_z135_set_termios() both hold the struct uart_port::lock
> spinlock, but men_z135_intr() does a spin_lock_irqsave() and
> men_z135_set_termios() does a normal spin_lock(), which can lead to a deadlock
> when an interrupt is called while the lock is being helt by
> men_z135_set_termios().
> 
> This was discovered using a insmod, hardware looppback send/receive, rmmod
> stress test.

Reviewed-by: Peter Hurley <peter@...leysoftware.com>


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