linux-kernel - Re: [PATCH] dm9000: Fix irq trigger type setup on non-dt platforms

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Date:	Tue, 09 Aug 2016 15:08:46 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	robert.jarzmik@...e.fr
Cc:	s.nawrocki@...sung.com, netdev@...r.kernel.org,
	linus.walleij@...aro.org, tglx@...utronix.de,
	b.zolnierkie@...sung.com, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH] dm9000: Fix irq trigger type setup on non-dt platforms

From: Robert Jarzmik <robert.jarzmik@...e.fr>
Date: Tue, 09 Aug 2016 19:20:44 +0200

> Sylwester Nawrocki <s.nawrocki@...sung.com> writes:
> 
>> Commit b5a099c67a1c36b "net: ethernet: davicom: fix devicetree irq
>> resource" causes an interrupt storm after the ethernet interface
>> is activated on S3C24XX platform (ARM non-dt), due to the interrupt
>> trigger type not being set properly.
>>
>> It seems, after adding parsing of IRQ flags in commit 7085a7401ba54e92b
>> "drivers: platform: parse IRQ flags from resources", there is no path
>> for non-dt platforms where irq_set_type callback could be invoked when
>> we don't pass the trigger type flags to the request_irq() call.
>>
>> In case of a board where the regression is seen the interrupt trigger
>> type flags are passed through a platform device's resource and it is
>> not currently handled properly without passing the irq trigger type
>> flags to the request_irq() call.  In case of OF an of_irq_get() call
>> within platform_get_irq() function seems to be ensuring required irq_chip
>> setup, but there is no equivalent code for non OF/ACPI platforms.
>>
>> This patch mostly restores irq trigger type setting code which has been
>> removed in commit ("net: ethernet: davicom: fix devicetree irq resource").
>>
>> Fixes: b5a099c67a1c36b913 ("net: ethernet: davicom: fix devicetree irq resource")
>>
>> Signed-off-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
>> ---
>>
>> Perhaps instead the core could be configuring the irqchip automatically as it
>> is done for OF/ACPI cases. I had doubts though if trying to make such changes
>> for a bug fix patch was the right thing to do.
> Hi Sylvester,
> 
> You're right, and I came to the same conclusion a bit earlier, in [1], but I
> didn't notice my FAI didn't actually send the mail. Your analysis of the core in
> non-OF/ACPI case is the reason I didn't post a patch for dm9000 ... I was
> overconfident in finding a reason in irq core code within a couple of days.
> 
> Therefore:
> Acked-by: Robert Jarzmik <robert.jarzmik@...e.fr>

Applied.