linux-kernel - Re: [PATCH -v3 40/47] PCI: Add pci bus removal through /sys/.../pci

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Message-ID: <CAE9FiQUEJ4Jvz0BHJ8LCBNpXWB3Cf6u3k9F1avAd4a-fkGOB=Q@mail.gmail.com>
Date:	Fri, 6 Apr 2012 09:01:39 -0700
From:	Yinghai Lu <yhlu.kernel@...il.com>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>, x86 <x86@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Randy Dunlap <rdunlap@...otime.net>, linux-doc@...r.kernel.org
Subject: Re: [PATCH -v3 40/47] PCI: Add pci bus removal through /sys/.../pci_bus/.../remove

On Fri, Apr 6, 2012 at 8:50 AM, Jiang Liu <liuj97@...il.com> wrote:
> Hi Yinghai,
>        I found many other drivers assume that a pci bus won't disappear if
> the corresponding PCI bridge device still exists. The sysfs interface proposed
> here breaks that assumption and may cause many access-after-free issues.
> So what's the purpose of this interface? Should we remove this interface or
> enhance other drivers to avoid invalid memory access issues?

ok, will make it only show up on root bus.

Yinghai
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