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

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Message-ID: <bb5a43e5-6036-3788-71ca-c411611e0ad9@gmail.com>
Date:   Sun, 26 Dec 2021 12:14:55 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>,
        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

On 25.12.2021 13:19, Lad, Prabhakar wrote:
> 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);

Usage of BUG_ON() is discouraged. Better handle the error w/o stopping
the whole system.

> 
> 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
>>
>>