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Date: Sat, 3 Oct 2026 08:43:31 +0100
From: Will Deacon <will@kernel.org>
To: Bui Duc Phuc <phucduc.bui@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>, linux-perf-users@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] perf/arm-smmuv3: Propagate errors from optional IRQ
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On Sat, Oct 03, 2026 at 07:07:12AM +0700, Bui Duc Phuc wrote:
> > Not sure about this. If it's optional, why should we bail the probe if
> > we don't manage to get an irq? Surely it's better to continue without
> > the interrupt in that case?
> >
> 
> platform_get_irq_optional() returns -ENXIO when no IRQ is available.
> Other negative return values indicate errors, including -EPROBE_DEFER.
> In the case of -EPROBE_DEFER, we should propagate the error so that
> the probe can be retried later.

Thanks, The -EPROBE_DEFER case seems more compelling, so perhaps we should
check for the expliitly (because it won't fail the probe altogether)?

Will