linux-kernel - Re: [PATCH] net: stmmac: platform: Fix misleading interrupt error msg

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Message-ID: <20200312194625.GA6684@DEFRL0001.localdomain>
Date:   Thu, 12 Mar 2020 20:46:25 +0100
From:   Markus Fuchs <mklntf@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     peppe.cavallaro@...com, alexandre.torgue@...com,
        joabreu@...opsys.com, mcoquelin.stm32@...il.com,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: stmmac: platform: Fix misleading interrupt error msg

On Wed, Mar 11, 2020 at 11:04:02PM -0700, David Miller wrote:
> From: Markus Fuchs <mklntf@...il.com>
> Date: Fri,  6 Mar 2020 17:38:48 +0100
> 
> > Not every stmmac based platform makes use of the eth_wake_irq or eth_lpi
> > interrupts. Use the platform_get_irq_byname_optional variant for these
> > interrupts, so no error message is displayed, if they can't be found.
> > Rather print an information to hint something might be wrong to assist
> > debugging on platforms which use these interrupts.
> > 
> > Signed-off-by: Markus Fuchs <mklntf@...il.com>
> 
> What do you mean the error message is misleading right now?
> 
> It isn't printing anything out at the moment in this situation.

Commit 7723f4c5ecdb driver core: platform: Add an error message to 
    platform_get_irq*()

The above commit added a generic dev_err() output to the platform_get_irq_byname
function.

My patch uses the platform_get_irq_byname_optional function, which
doesn't print anything and adds the original dev_err output as dev_info output 
to the driver.
Otherwise there would be no output at all even for platforms in need of these 
irqs.