linux-kernel - Re: Broken pci_block_user_cfg

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Message-ID: <20110825181912.GB27183@redhat.com>
Date:	Thu, 25 Aug 2011 21:19:12 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Jan Kiszka <jan.kiszka@...mens.com>
Cc:	Brian King <brking@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Matthew Wilcox <matthew@....cx>
Subject: Re: Broken pci_block_user_cfg_access interface

On Thu, Aug 25, 2011 at 03:06:01PM +0200, Jan Kiszka wrote:
> > I took a look at the sysfs triggered pci reset function and don't see any way
> > that the controlling device driver ever gets to be involved in this reset.
> > If code outside the ipr driver were to reset the adapter, the adapter firmware
> > would be left in an uninitialized state and until scsi core starts timing
> > out ops and driving EH, the card would be unusable. I can't imagine the
> > ipr driver is unique in this.
> 
> Right, that's why a PCI core service is needed for coordination.
> 
> Jan

But why do we want to trigger reset through sysfs while the
driver runs?

> -- 
> Siemens AG, Corporate Technology, CT T DE IT 1
> Corporate Competence Center Embedded Linux
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