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

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Message-ID: <4A242C81.3080309@ru.mvista.com>
Date:	Mon, 01 Jun 2009 23:31:13 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	jgarzik@...ox.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()

Hello, I 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>

>   Jeff, have you forgotten about this one?

    PING.

MBR, Sergei
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