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From: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
To: Greg KH <greg@kroah.com>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: pci_walk_bus race condition
Date: Mon, 29 May 2006 08:41:11 +0800	[thread overview]
Message-ID: <1148863271.4377.521.camel@ymzhang-perf.sh.intel.com> (raw)
In-Reply-To: <20060526135039.GA13280@kroah.com>

On Fri, 2006-05-26 at 21:50, Greg KH wrote:
> On Fri, May 26, 2006 at 02:35:16PM +0800, Zhang, Yanmin wrote:
> > pci_walk_bus has a race with pci_destroy_dev. In the while loop,
> > when the callback function is called, dev pointed by next might be
> > freed and erased. So later on access to dev might cause kernel panic.
> 
> Have you seen this happen?  The only user of this function is the PPC64
> EEH handler, which last time I checked, didn't run on Intel based
> processors :)
I am enabling PCI-Express AER in kernel and want to use it. After
double-checking, I found the lock is not good.

Thanks,
Yanmin

  reply	other threads:[~2006-05-29  0:45 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-05-26  6:35 Zhang, Yanmin
2006-05-26 13:50 ` Greg KH
2006-05-29  0:41   ` Zhang, Yanmin [this message]
2006-05-29  8:05     ` Zhang, Yanmin
2006-06-02  4:35       ` Zhang, Yanmin
2006-06-02  5:11         ` Andrew Morton
2006-06-02  5:24           ` Andrew Morton
2006-06-02 10:51             ` Zhang, Yanmin

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