From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
linux-ide@vger.kernel.org,
Linux Kernel Mailing List <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 10:47:41 +0200 [thread overview]
Message-ID: <CAHp75VcdwozpUJVB17VmCDska7euYnx1VjZLnCaZ8DHG+_3vYg@mail.gmail.com> (raw)
In-Reply-To: <d91cf14d-c7d8-1c61-9071-102f38e8c924@opensource.wdc.com>
On Fri, Dec 10, 2021 at 4:47 AM Damien Le Moal
<damien.lemoal@opensource.wdc.com> wrote:
> On 2021/12/09 23:59, 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;
No, this is wrong for the same reasons I explained to Sergey.
The problem is that this is _optional API and it has been misdesigned.
Replacing things like above will increase the mess.
> return ret;
>
> Otherwise, I do not think that removing the "if (!irq)" hunk is safe. no ?
No. This is not a business of the caller to workaround implementation
details (bugs) of the core APIs.
If something goes wrong, then it's platform_get_irq() to blame, and
not the libahci_platform.
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2021-12-10 8:48 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 [this message]
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
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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