linux-kernel - Re: [PATCH 2/2 resend] libata-sff: avoid byte swapping in ata_sff_data

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Message-ID: <49DC4545.5020702@pobox.com>
Date:	Wed, 08 Apr 2009 02:33:41 -0400
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
CC:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	alan@...rguk.ukuu.org.uk
Subject: Re: [PATCH 2/2 resend] libata-sff: avoid byte swapping in ata_sff_data_xfer()

Sergei Shtylyov wrote:
> Handling of the trailing byte in ata_sff_data_xfer() is suboptimal bacause:
> 
> - it always initializes the padding buffer to 0 which is not really needed in
>   both the read and write cases;
> 
> - it has to use memcpy() to transfer a single byte from/to the padding buffer;
> 
> - it uses io{read|write}16() accessors which swap bytes on the big endian CPUs
>   and so have to additionally convert the data from/to the little endian format
>   instead of using io{read|write}16_rep() accessors which are not supposed to
>   change the byte ordering.
> 
> Signed-off-by: Sergei Shtylyov <sshtylyov@...mvista.com>

applied


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