linux-kernel - Re: [PATCH] libata-sff: Don't call bmdma

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Date:	Thu, 25 Jan 2007 21:11:32 -0500
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	David Woodhouse <dwmw2@...radead.org>,
	Alan <alan@...rguk.ukuu.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] libata-sff: Don't call bmdma_stop on non DMA capable
 controllers

Linus Torvalds wrote:
> So *if* you use the new "iomap" interfaces, and the new "pci_iomap()" 
> things, that should actually not just allow drivers (like the ATA layer) 
> to share much more code between the PIO and MMIO cases, but it hopefully 
> actually makes it easier for strange architectures to do it all.

Another aside:  Tejun took my libata iomap and came up with something 
I'm quite happy with, so libata will /finally/ switch over to using the 
new iomap interfaces for 98% of all drivers, as of 2.6.21.

Look at "[PATCHSET] Managed device resources, take #3" on LKML if you're 
interested.  Tejun's 'devres' stuff makes it a lot easier for drivers to 
reserve, map, unmap, and free various hardware resources.

	Jeff

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