From: Sergey Shtylyov <s.shtylyov@omp.ru>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Damien Le Moal <damien.lemoal@opensource.wdc.com>,
<linux-ide@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
Hans de Goede <hdegoede@redhat.com>, Jens Axboe <axboe@kernel.dk>
Subject: Re: [PATCH v1 1/2] ata: libahci_platform: Get rid of dup message when IRQ can't be retrieved
Date: Fri, 10 Dec 2021 14:19:52 +0300 [thread overview]
Message-ID: <9e6b2e9a-e958-0c14-6570-135607041978@omp.ru> (raw)
In-Reply-To: <YbMwBFf5e7k2o6W5@smile.fi.intel.com>
On 12/10/21 1:46 PM, Andy Shevchenko wrote:
>>>> platform_get_irq() will print a message when it fails.
>>>> No need to repeat this.
>>>>
>>>> While at it, drop redundant check for 0 as platform_get_irq() spills
>>>> out a big WARN() in such case.
>>>
>>> The reason you should be able to remove the "if (!irq)" test is that
>>> platform_get_irq() never returns 0. At least, that is what the function kdoc
>>> says. But looking at platform_get_irq_optional(), which is called by
>>> platform_get_irq(), the out label is:
>>>
>>> WARN(ret == 0, "0 is an invalid IRQ number\n");
>>> return ret;
>>>
>>> So 0 will be returned as-is. That is rather weird. That should be fixed to
>>> return -ENXIO:
>>>
>>> if (WARN(ret == 0, "0 is an invalid IRQ number\n"))
>>> return -ENXIO;
>>> return ret;
>>
>> My unmerged patch (https://marc.info/?l=linux-kernel&m=163623041902285) does this
>> but returns -EINVAL instead.
>>
>>> Otherwise, I do not think that removing the "if (!irq)" hunk is safe. no ?
>>
>> Of course it isn't...
>
> It's unsubstantiated statement. The vIRQ 0 shouldn't be returned by any of
> those API calls.
We do _not_ know what needs to be fixed, that's the problem, and that's why the WARN()
is there...
> If it is the case, go and fix them, no need to workaround
> in each of the callers.
There's a need to work around as long as IRQ0 ican be returned, otherwise we get
partly functioning or non-functioning drivers...
MBR, Sergey
next prev parent reply other threads:[~2021-12-10 11:19 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-09 14:59 [PATCH v1 1/2] ata: libahci_platform: Get rid of dup message when IRQ can't be retrieved Andy Shevchenko
2021-12-09 14:59 ` [PATCH v1 2/2] ata: libahci_platform: Remove bogus 32-bit DMA mask attempt Andy Shevchenko
2021-12-10 19:34 ` Andy Shevchenko
2021-12-11 0:04 ` Damien Le Moal
2021-12-17 0:58 ` Damien Le Moal
2021-12-17 11:57 ` Andy Shevchenko
2021-12-09 15:21 ` [PATCH v1 1/2] ata: libahci_platform: Get rid of dup message when IRQ can't be retrieved Hans de Goede
2021-12-09 17:24 ` Sergey Shtylyov
2021-12-09 17:42 ` Andy Shevchenko
2021-12-09 18:22 ` Sergey Shtylyov
2021-12-09 19:22 ` Andy Shevchenko
2021-12-09 19:27 ` Andy Shevchenko
2021-12-09 20:31 ` Sergey Shtylyov
2021-12-09 20:29 ` Sergey Shtylyov
2021-12-10 10:44 ` Andy Shevchenko
2021-12-10 11:14 ` Sergey Shtylyov
2021-12-10 11:28 ` Andy Shevchenko
2021-12-10 17:39 ` Sergey Shtylyov
2021-12-10 17:51 ` Andy Shevchenko
2021-12-09 22:49 ` Damien Le Moal
2021-12-09 22:57 ` Damien Le Moal
2021-12-10 8:47 ` Andy Shevchenko
2021-12-10 16:38 ` Sergey Shtylyov
2021-12-10 17:57 ` Andy Shevchenko
2021-12-10 8:59 ` Sergey Shtylyov
2021-12-10 10:46 ` Andy Shevchenko
2021-12-10 11:19 ` Sergey Shtylyov [this message]
2021-12-10 11:36 ` Andy Shevchenko
2021-12-10 17:15 ` Sergei Shtylyov
2021-12-10 17:59 ` Andy Shevchenko
2021-12-10 19:01 ` Sergey Shtylyov
2021-12-10 19:25 ` Andy Shevchenko
2021-12-10 19:30 ` Sergey Shtylyov
2021-12-10 19:35 ` Sergei Shtylyov
2021-12-11 10:13 ` Sergey Shtylyov
2021-12-13 11:26 ` Andy Shevchenko
2021-12-10 23:45 ` Damien Le Moal
2021-12-11 10:25 ` Sergey Shtylyov
2021-12-12 22:39 ` Damien Le Moal
2021-12-13 11:52 ` Andy Shevchenko
2021-12-13 21:36 ` Damien Le Moal
2021-12-13 22:02 ` Andy Shevchenko
2021-12-13 11:49 ` Andy Shevchenko
2021-12-13 11:46 ` Andy Shevchenko
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