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Re: pci_alloc_consistent usage

To: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Subject: Re: pci_alloc_consistent usage
From: Christoph Hellwig <hch@infradead.org>
Date: Tue, 27 May 2003 11:53:22 +0100
Cc: ralf@linux-mips.org, wgowcher@yahoo.com, linux-mips@linux-mips.org
In-reply-to: <20030527.190749.39150100.nemoto@toshiba-tops.co.jp>; from anemo@mba.ocn.ne.jp on Tue, May 27, 2003 at 07:07:49PM +0900
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20030523215935.71373.qmail@web11901.mail.yahoo.com> <20030527091740.GA23296@linux-mips.org> <20030527.190749.39150100.nemoto@toshiba-tops.co.jp>
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On Tue, May 27, 2003 at 07:07:49PM +0900, Atsushi Nemoto wrote:
> >>>>> On Tue, 27 May 2003 11:17:40 +0200, Ralf Baechle <ralf@linux-mips.org> 
> >>>>> said:
> ralf> Use the value returned by pci_alloc_consistent in *dma_handle
> ralf> instead of trying to do any conversions with of
> ralf> pci_alloc_consistent's return value.
> 
> How about virt_to_page()?
> 
> Currently, many sound drivers (including ALSA) pass a
> pci_alloc_consistent's return value to virt_to_page.

You are not allow to do so.  Any driver doing this is broken.


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