linux-kernel - Re: [BUG] skge: a possible sleep-in-atomic bug in skge

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Message-ID: <20171212211849.3e8b43b9@xeon-e3>
Date:   Tue, 12 Dec 2017 21:18:49 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     David Miller <davem@...emloft.net>
Cc:     baijiaju1990@...il.com, mlindner@...vell.com, shemminger@...l.org,
        shemminger@...ux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [BUG] skge: a possible sleep-in-atomic bug in skge_remove

On Tue, 12 Dec 2017 20:57:01 -0500 (EST)
David Miller <davem@...emloft.net> wrote:

> From: Stephen Hemminger <stephen@...workplumber.org>
> Date: Tue, 12 Dec 2017 10:22:40 -0800
> 
> > On Tue, 12 Dec 2017 08:34:45 -0500 (EST)
> > David Miller <davem@...emloft.net> wrote:
> >   
> >> From: Jia-Ju Bai <baijiaju1990@...il.com>
> >> Date: Tue, 12 Dec 2017 16:38:12 +0800
> >>   
> >> > According to drivers/net/ethernet/marvell/skge.c, the driver may sleep
> >> > under a spinlock.
> >> > The function call path is:
> >> > skge_remove (acquire the spinlock)
> >> >   free_irq --> may sleep
> >> > 
> >> > I do not find a good way to fix it, so I only report.
> >> > This possible bug is found by my static analysis tool (DSAC) and
> >> > checked by my code review.    
> >> 
> >> This was added by:
> >> 
> >> commit a9e9fd7182332d0cf5f3e601df3e71dd431b70d7
> >> Author: Stephen Hemminger <shemminger@...tta.com>
> >> Date:   Tue Sep 27 13:41:37 2011 -0400
> >> 
> >>     skge: handle irq better on single port card
> >> 
> >> I think the free_irq() can be moved below the unlock.
> >> 
> >> Stephen, please take a look.  
> > 
> > The IRQ was being free twice.
> > How did you see it, I really doubt any multi-port SKGE cards
> > still exist.  
> 
> He sees it by reading the code, please take a look at this
> and move the free_irq() out of the spin locked section since
> it can sleep.

Thanks, I was hoping for some automated static analysis tool.