linux-kernel - Re: [PATCH 2/2] ata: pata_platform: Merge pata_of_platform into pata

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Message-ID: <e852a63f-cb84-2683-f102-2f8572b1799d@omp.ru>
Date:   Sat, 18 Dec 2021 14:56:40 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
CC:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        "open list:LIBATA SUBSYSTEM (Serial and Parallel ATA drivers)" 
        <linux-ide@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] ata: pata_platform: Merge pata_of_platform into
 pata_platform

On 18.12.2021 13:51, Lad, Prabhakar wrote:

[...]
>>> Merge the OF pata_of_platform driver into pata_platform.
>>>
>>> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
[...]
>>> diff --git a/drivers/ata/pata_platform.c b/drivers/ata/pata_platform.c
>>> index cb3134bf88eb..b8d8d51bc562 100644
>>> --- a/drivers/ata/pata_platform.c
>>> +++ b/drivers/ata/pata_platform.c
[...]
>>> @@ -168,23 +180,83 @@ int __pata_platform_probe(struct device *dev, struct resource *io_res,
>> [...]
>>>
>>> -static int pata_platform_probe(struct platform_device *pdev)
>>> +static int pata_of_platform_get_pdata(struct platform_device *ofdev,
>>> +                                   struct pata_platform_priv *priv)
>>>   {
>>> -     struct resource *io_res;
>>> +     struct device_node *dn = ofdev->dev.of_node;
>>>        struct resource *ctl_res;
>>>        struct resource *irq_res;
>>> +     struct resource *io_res;
>>
>>     Should be declared before ctl_res...
>>
> Any reason why?

    Well, it's a natural order, following from the driver logic, no?

>>> +     int pio_mode = 0;
>>> +     int irq;
>>> +     int ret;
>>> +
>>> +     ctl_res = devm_kzalloc(&ofdev->dev, sizeof(*ctl_res), GFP_KERNEL);
>>> +     io_res = devm_kzalloc(&ofdev->dev, sizeof(*io_res), GFP_KERNEL);
>>> +     irq_res = devm_kzalloc(&ofdev->dev, sizeof(*irq_res), GFP_KERNEL);
>>> +     if (!ctl_res || !io_res || !irq_res)
>>> +             return -ENOMEM;
>>
>>     Can't we get away from these allocated resources? Or at least irq_res?
>>
> Do you have any suggestions?

    Let me look deeper...

[...]
>>> @@ -198,32 +270,63 @@ static int pata_platform_probe(struct platform_device *pdev)
[...]
>>> +     if (ret)
>>> +             return ret;
>>> +
>>> +     priv->sht = &pata_platform_sht;
>>
>>     Aren't those structures identical between the formerly separate drivers?
>>
> Yes so are you suggesting to drop sht from priv and use it directly?

    Yep.

> Cheers,
> Prabhakar

MBR, Sergey