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

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Message-ID: <4A314CB6.5090004@ru.mvista.com>
Date:	Thu, 11 Jun 2009 22:28:06 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Jeff Garzik <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.

Jeff Garzik wrote:

>> 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.

> This has been queued to libata-dev.git#upstream, i.e. linux-next queue, 

    Ah, haven't looked there, so it appeared as forgotten since I know you 
usually reply with 'applied'.

> for a long time.  Apologies if I forgot the 'applied' reply.

> Just sent this upstream, as linux-ide should show.

    Thanks. I began to think of reworking it to avoid even io*_rep() as per 
my followup mail and resending... well, it's good enogh as is. :-)

>     Jeff

MBR, Sergei
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