linux-kernel - Re: [patch/rfc 2.6.20-git] parport reports physical devices

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Date:	Sun, 18 Feb 2007 21:28:35 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	David Brownell <david-b@...bell.net>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Jean Delvare <khali@...ux-fr.org>, Greg KH <greg@...ah.com>
Subject: Re: [patch/rfc 2.6.20-git] parport reports physical devices

On Sun, 18 Feb 2007 21:08:07 -0800 David Brownell wrote:

> Currently a parport_driver can't get a handle on the device node for the
> underlying parport (PNPACPI, PCI, etc).  That prevents correct placement
> of sysfs child nodes, which can affect things like power management.
> 
> This patch resolves that issue for non-legacy configurations:
> 
>     * "struct parport" now has a field pointing to that device node,
>       and non-legacy port drivers now initialize that device pointer:
> 	- parport_mfc3 (can't test or build; no Amiga + Zorro here)
> 	- parport_pc (and stop using only pci_device internally)
> 	- parport_serial
> 	- parport_sunbpp (can't test or build, no SPARC + SBUS here)
> 
>     * pnp now initializes device dma masks (24bits), preventing oopses
>       when generic dma calls are made using pnp device nodes
> 
>     * some of the layered parport_driver code now uses that pointer:
> 	- i2c-parport (parent of i2c_adapter)
> 	- spi_butterfly (parent of spi_master, allowing cruft removal)
> 	- lp (creating class_device)
> 	- ppdev (parent of parportN device)
> 	- tipar (creating class_device)
> 
> Sanity tested on a PC, where PNPACPI provides the device to parport_pc,
> using spi_butterfly.  But I've got to wonder about parport DMA...

Does this patch address http://bugzilla.kernel.org/show_bug.cgi?id=5496 ?

What are you wondering about parport DMA?
Please see http://bugzilla.kernel.org/show_bug.cgi?id=7491
and http://bugzilla.kernel.org/show_bug.cgi?id=7492

---
~Randy
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