netdev - Re: [PATCH 2/8] net: pxa168_eth: Use platform_get

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Date:   Sat, 25 Dec 2021 12:19:09 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/8] net: pxa168_eth: Use platform_get_irq() to get the interrupt

Hi Andy,

Thank you for the review.

On Sat, Dec 25, 2021 at 11:24 AM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>
>
>
> On Friday, December 24, 2021, Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
>>
>> platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
>> allocation of IRQ resources in DT core code, this causes an issue
>> when using hierarchical interrupt domains using "interrupts" property
>> in the node as this bypasses the hierarchical setup and messes up the
>> irq chaining.
>>
>> In preparation for removal of static setup of IRQ resource from DT core
>> code use platform_get_irq().
>>
>> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>> ---
>>  drivers/net/ethernet/marvell/pxa168_eth.c | 9 +++++----
>>  1 file changed, 5 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/marvell/pxa168_eth.c b/drivers/net/ethernet/marvell/pxa168_eth.c
>> index 1d607bc6b59e..52bef50f5a0d 100644
>> --- a/drivers/net/ethernet/marvell/pxa168_eth.c
>> +++ b/drivers/net/ethernet/marvell/pxa168_eth.c
>> @@ -1388,7 +1388,6 @@ static int pxa168_eth_probe(struct platform_device *pdev)
>>  {
>>         struct pxa168_eth_private *pep = NULL;
>>         struct net_device *dev = NULL;
>> -       struct resource *res;
>>         struct clk *clk;
>>         struct device_node *np;
>>         int err;
>> @@ -1419,9 +1418,11 @@ static int pxa168_eth_probe(struct platform_device *pdev)
>>                 goto err_netdev;
>>         }
>>
>> -       res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>> -       BUG_ON(!res);
>> -       dev->irq = res->start;
>> +       err = platform_get_irq(pdev, 0);
>> +       if (err == -EPROBE_DEFER)
>
>
>  What about other errors?
>
Ouch I missed it...
>
>>
>> +               goto err_netdev;
>> +       BUG_ON(dev->irq < 0);
>
>
> ??? What is this and how it supposed to work?
>
.. should have been BUG_ON(dev->irq < 0);

Cheers,
Prabhakar
>>
>> +       dev->irq = err;
>>         dev->netdev_ops = &pxa168_eth_netdev_ops;
>>         dev->watchdog_timeo = 2 * HZ;
>>         dev->base_addr = 0;
>> --
>> 2.17.1
>>
>
>
> --
> With Best Regards,
> Andy Shevchenko
>
>