linux-kernel - Re: [PATCH for v3.19, v2] Avoid that sd_shutdown() triggers a kernel warning

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Message-ID: <20150115160612.GA31446@infradead.org>
Date:	Thu, 15 Jan 2015 08:06:12 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Bart Van Assche <bvanassche@....org>,
	James Bottomley <jbottomley@...allels.com>,
	Hannes Reinecke <hare@...e.de>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH for v3.19, v2] Avoid that sd_shutdown() triggers a kernel
 warning

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.
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