linux-kernel - Re: [PATCH 05/20] pata_efar: always program master_data before slave

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Date:	Thu, 10 Feb 2011 18:14:54 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Sergei Shtylyov <sshtylyov@...sta.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/20] pata_efar: always program master_data before slave_data

Hi,

On Thu, Feb 10, 2011 at 3:23 PM, Sergei Shtylyov <sshtylyov@...sta.com> wrote:
> Hello.
>
> On 08-02-2011 15:24, Bartlomiej Zolnierkiewicz wrote:
> [...]
>
>> We may need to set SITRE before programming slave_data.
>
>> This makes pata_efar match the behavior of IDE's slc90e66 host driver
>> and also of libata's ata_piix one.
>
>> Signed-off-by: Bartlomiej Zolnierkiewicz<bzolnier@...il.com>
>
> [...]
>
>> diff --git a/drivers/ata/pata_efar.c b/drivers/ata/pata_efar.c
>> index 1e2ff7d..7f564d7 100644
>> --- a/drivers/ata/pata_efar.c
>> +++ b/drivers/ata/pata_efar.c
>> @@ -74,10 +74,12 @@ static void efar_set_timings(struct ata_port *ap,
>> struct ata_device *adev,
>>                             u8 pio, bool use_mwdma)
>>  {
>>        struct pci_dev *dev     = to_pci_dev(ap->host->dev);
>> +       unsigned int is_slave   = (adev->devno != 0);
>
>   What's the point of this variable? To save one pointer dereference? :-)

Make code more similar to ata_piix.c and thus easier for comparisons
through 'diff -ub'.

In reality it doesn't matter now that much as pata_efar (same for
pata_oldpiix) vanishes completely at the end of the patch series.. :-)

Thanks,
Bartlomiej
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