linux-kernel - Re: [PATCH] of_mdio: fix phy interrupt passing

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Date:	Mon, 17 Feb 2014 17:42:07 +0000
From:	Ben Dooks <ben.dooks@...ethink.co.uk>
To:	Florian Fainelli <f.fainelli@...il.com>
CC:	Grant Likely <grant.likely@...aro.org>,
	linux-kernel@...ts.codethink.co.uk,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Subject: Re: [PATCH] of_mdio: fix phy interrupt passing

On 17/02/14 17:26, Florian Fainelli wrote:
> Hi Ben,
>
> 2014-02-17 8:29 GMT-08:00 Ben Dooks <ben.dooks@...ethink.co.uk>:
>> The of_mdiobus_register_phy() is not setting phy->irq this causing
>> some drivers to incorrectly assume that the PHY does not have an
>> IRQ associated with it or install an interrupt handler for the
>> PHY.
>>
>> Simplify the code setting irq and set the phy->irq at the same
>> time so that the case if mdio->irq is not NULL is easier to read.
>
> The real bug fix, which is not properly explained here, is that
> irq_of_parse_and_map() should return values > 0 when the interrupt is
> valid, so this makes me wonder why we are not propagating the return
> value from irq_of_parse_and_map() in case the call to
> of_irq_parse_one() does return something non-zero?

No, the first issue is phy->dev never gets set, which causes the
issue. The cleanup was added as it seemed easier to put it in with
this.

I think phy->irq is already initialised to PHY_POLL and thus there
is no need to set phy->irq if the irq_of_parse_and_map() fails.

-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius
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