From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Chen Ni <nichen@iscas.ac.cn>,
lee@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] mfd: intel-lpss: Fix IRQ check
Date: Wed, 1 Nov 2023 11:38:28 +0200 [thread overview]
Message-ID: <ZUIclOuVocLUUk7_@smile.fi.intel.com> (raw)
In-Reply-To: <20231101070310.GF17433@black.fi.intel.com>
On Wed, Nov 01, 2023 at 09:03:10AM +0200, Mika Westerberg wrote:
> On Wed, Nov 01, 2023 at 06:26:43AM +0000, Chen Ni wrote:
> > platform_get_irq() returns a negative error code to indicating an
> > error. So in intel_lpss_probe() the unset / erroneous IRQ should be
> > returned as is.
> >
> > Fixes: 4b45efe85263 ("mfd: Add support for Intel Sunrisepoint LPSS devices")
> There is no need for Fixes tag here.
I said that already in v1 :-)
...
> > - if (!info || !info->mem || info->irq <= 0)
> > + if (!info || !info->mem)
>
> This check (info->irq <= 0) covers both "invalid" interrupt numbers
> (that's the negative errno and 0 as no interrupt) so I don't see how
> this change makes it any better and the changelog does not clarify it
> either.
It makes sense. The IRQ here may not be 0. We should actually fix
the PCI code to guarantee that (platform_get_irq() guarantees that
in platform driver).
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2023-11-01 9:38 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-01 6:26 [PATCH v2] mfd: intel-lpss: Fix IRQ check Chen Ni
2023-11-01 7:03 ` Mika Westerberg
2023-11-01 9:38 ` Andy Shevchenko [this message]
2023-11-01 9:42 ` Andy Shevchenko
2023-11-01 10:47 ` Mika Westerberg
2023-11-02 12:38 ` Andy Shevchenko
2023-11-03 6:41 ` Mika Westerberg
2023-11-03 14:58 ` Andy Shevchenko
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