Re: [patch for 2.6.33? 1/1] ata: call flush_dcache_page() around PIO data transfers in libata-aff.c

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To: Jeff Garzik <jgarzik@xxxxxxxxx>
Subject: Re: [patch for 2.6.33? 1/1] ata: call flush_dcache_page() around PIO data transfers in libata-aff.c
From: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 3 Feb 2010 17:40:44 +0000
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, James Bottomley <James.Bottomley@xxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, David Miller <davem@xxxxxxxxxxxxx>, jeff@xxxxxxxxxx, linux-ide@xxxxxxxxxxxxxxx, stable@xxxxxxxxxx, tj@xxxxxxxxxx
In-reply-to: <4B69AF42.5050508@xxxxxxxxx>
List-id: <linux-ide.vger.kernel.org>

> 	if (high mem)
> 		local irq save
> 		kmap
> 		xfer
> 		kunmap
> 		local irq restore

At the very least you need to do

	irq save
	kmap
	copy to local buffer
	kunmap
	local irq restore
	xfer

and the mirror image for read.


Alan
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References:
- Re: [patch for 2.6.33? 1/1] ata: call flush_dcache_page() around PIO data transfers in libata-aff.c
  - From: James Bottomley
- Re: [patch for 2.6.33? 1/1] ata: call flush_dcache_page() around PIO data transfers in libata-aff.c
  - From: Andrew Morton
- Re: [patch for 2.6.33? 1/1] ata: call flush_dcache_page() around PIO data transfers in libata-aff.c
  - From: Jeff Garzik
- Re: [patch for 2.6.33? 1/1] ata: call flush_dcache_page() around PIO data transfers in libata-aff.c
  - From: David Miller
- Re: [patch for 2.6.33? 1/1] ata: call flush_dcache_page() around PIO data transfers in libata-aff.c
  - From: James Bottomley
- Re: [patch for 2.6.33? 1/1] ata: call flush_dcache_page() around PIO data transfers in libata-aff.c
  - From: Catalin Marinas
- Re: [patch for 2.6.33? 1/1] ata: call flush_dcache_page() around PIO data transfers in libata-aff.c
  - From: James Bottomley
- Re: [patch for 2.6.33? 1/1] ata: call flush_dcache_page() around PIO data transfers in libata-aff.c
  - From: Jeff Garzik
- Re: [patch for 2.6.33? 1/1] ata: call flush_dcache_page() around PIO data transfers in libata-aff.c
  - From: Andrew Morton
- Re: [patch for 2.6.33? 1/1] ata: call flush_dcache_page() around PIO data transfers in libata-aff.c
  - From: Jeff Garzik

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