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From: Christoph Hellwig <hch@infradead.org>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Bart Van Assche <bvanassche@acm.org>,
	James Bottomley <jbottomley@parallels.com>,
	Hannes Reinecke <hare@suse.de>,
	"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH for v3.19, v2] Avoid that sd_shutdown() triggers a kernel warning
Date: Thu, 15 Jan 2015 08:06:12 -0800	[thread overview]
Message-ID: <20150115160612.GA31446@infradead.org> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1501141002500.1464-100000@iolanthe.rowland.org>

On Wed, Jan 14, 2015 at 10:07:00AM -0500, Alan Stern wrote:
> and the kernfs core insures that the underlying device won't be 
> deallocated while a sysfs method runs.

It has a reference to keep it from beeing freed, but so far I can't find
anything that prevents ->remove from beeing called while we are in or
just before a method call.

> > But this seems like a more generic problem, and at least a quick glance at
> > the pci_driver methods seems like others don't have a good
> > synchroniation of ->remove against random driver methods.
> 
> Can you give one or two examples?

I look at the sriov_configure PCI method, or the various sub-methods
under pci_driver.err_handler.

  reply	other threads:[~2015-01-15 16:06 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20150108131508.GA31022@infradead.org>
     [not found] ` <Pine.LNX.4.44L0.1501121116220.1707-100000@iolanthe.rowland.org>
2015-01-14  9:33   ` Christoph Hellwig
2015-01-14 15:07     ` Alan Stern
2015-01-15 16:06       ` Christoph Hellwig [this message]
2015-01-15 18:22         ` sysfs methods can race with ->remove Alan Stern
2015-01-15 19:40           ` Tejun Heo
2015-01-26 17:19             ` Christoph Hellwig
2015-01-26 18:38               ` Alan Stern
2015-01-20 15:11     ` [PATCH for v3.19, v2] Avoid that sd_shutdown() triggers a kernel warning Alan Stern

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