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Date: Wed, 30 Apr 2014 08:42:09 -0300 From: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com> To: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com> Cc: netdev@...r.kernel.org, Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>, Lior Amsalem <alior@...vell.com>, Tawfik Bayouk <tawfik@...vell.com>, Gregory Clement <gregory.clement@...e-electrons.com>, "David S. Miller" <davem@...emloft.net>, linux-arm-kernel@...ts.infradead.org Subject: Re: [PATCH for v3.15] net: mvmdio: Check for a valid interrupt instead of an error On Apr 29, Sebastian Hesselbarth wrote: > On 04/29/2014 09:49 PM, Ezequiel Garcia wrote: > > The following commit: > > > > commit 9ec36cafe43bf835f8f29273597a5b0cbc8267ef > > Author: Rob Herring <robh@...nel.org> > > Date: Wed Apr 23 17:57:41 2014 -0500 > > > > of/irq: do irq resolution in platform_get_irq > > > > changed platform_get_irq() which now returns ENODEV and EPROBE_DEFER, > > in addition to ENXIO. If there's no interrupt for mvmdio, platform_get_irq() > > returns ENODEV, but we currently check only for ENXIO. > > > > Fix this by looking for a positive integer, which is the proper way of > > validating a virtual interrupt number. > > > > Signed-off-by: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com> > > --- > > drivers/net/ethernet/marvell/mvmdio.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/net/ethernet/marvell/mvmdio.c b/drivers/net/ethernet/marvell/mvmdio.c > > index b161a52..eb2cabf 100644 > > --- a/drivers/net/ethernet/marvell/mvmdio.c > > +++ b/drivers/net/ethernet/marvell/mvmdio.c > > @@ -232,7 +232,7 @@ static int orion_mdio_probe(struct platform_device *pdev) > > clk_prepare_enable(dev->clk); > > > > dev->err_interrupt = platform_get_irq(pdev, 0); > > - if (dev->err_interrupt != -ENXIO) { > > + if (dev->err_interrupt > 0) { > > Ezequiel, > > I cannot find where Rob's mentioned patch set adds -ENODEV, but isn't Well, I don't think it's not mentioned in the patch. The path is: platform_get_irq -> of_irq_get -> of_irq_parse_one -> EINVAL. So it's EINVAL, not ENODEV. But the lesson is to avoid checking for a particular error (except EPROBE_DEFER which is special) because it's a fragile practice. > the semantic for -EPROBE_DEFER: there *should* be an irq, but it is > not yet available. That basically means, we should also defer on that > error otherwise we would ignore that we have actually been given an irq > to work with, right? > Yes, I agree. Did another patch for that, but haven't send it yet. AFAICS, mvebu platforms will never hit the deferred case as the irqchip is the first driver registered (as per drivers/Makefile). Not that we should count on that :) -- Ezequiel GarcĂa, Free Electrons Embedded Linux, Kernel and Android Engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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