netdev - Re: [PATCH net] net: phy: ti: take into account all possible interrupt sources

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Date:   Mon, 1 Mar 2021 11:48:21 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Ioana Ciornei <ciorneiioana@...il.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, andrew@...n.ch,
        hkallweit1@...il.com, linux@...linux.org.uk,
        Ioana Ciornei <ioana.ciornei@....com>,
        Sven Schuchmann <schuchmann@...leissheimer.de>
Subject: Re: [PATCH net] net: phy: ti: take into account all possible
 interrupt sources

On Mon, 1 Mar 2021 10:21:14 +0200 Ioana Ciornei wrote:
> On Sun, Feb 28, 2021 at 12:00:27PM -0800, Jakub Kicinski wrote:
> > On Fri, 26 Feb 2021 17:30:20 +0200 Ioana Ciornei wrote:  
> > > diff --git a/drivers/net/phy/dp83822.c b/drivers/net/phy/dp83822.c
> > > index be1224b4447b..f7a2ec150e54 100644
> > > --- a/drivers/net/phy/dp83822.c
> > > +++ b/drivers/net/phy/dp83822.c
> > > @@ -290,6 +290,7 @@ static int dp83822_config_intr(struct phy_device *phydev)
> > >  
> > >  static irqreturn_t dp83822_handle_interrupt(struct phy_device *phydev)
> > >  {
> > > +	bool trigger_machine = false;
> > >  	int irq_status;
> > >  
> > >  	/* The MISR1 and MISR2 registers are holding the interrupt status in
> > > @@ -305,7 +306,7 @@ static irqreturn_t dp83822_handle_interrupt(struct phy_device *phydev)
> > >  		return IRQ_NONE;
> > >  	}
> > >  	if (irq_status & ((irq_status & GENMASK(7, 0)) << 8))
> > > -		goto trigger_machine;
> > > +		trigger_machine = true;
> > >  
> > >  	irq_status = phy_read(phydev, MII_DP83822_MISR2);
> > >  	if (irq_status < 0) {
> > > @@ -313,11 +314,11 @@ static irqreturn_t dp83822_handle_interrupt(struct phy_device *phydev)
> > >  		return IRQ_NONE;
> > >  	}
> > >  	if (irq_status & ((irq_status & GENMASK(7, 0)) << 8))
> > > -		goto trigger_machine;
> > > +		trigger_machine = true;
> > >  
> > > -	return IRQ_NONE;
> > > +	if (!trigger_machine)
> > > +		return IRQ_NONE;
> > >  
> > > -trigger_machine:
> > >  	phy_trigger_machine(phydev);
> > >  
> > >  	return IRQ_HANDLED;  
> > 
> > Would it be better to code it up as:
> > 
> > 	irqreturn_t ret = IRQ_NONE;
> > 
> > 	if (irq_status & ...)
> > 		ret = IRQ_HANDLED;
> > 
> > 	/* .. */
> > 
> > 	if (ret != IRQ_NONE)
> > 		phy_trigger_machine(phydev);
> > 
> > 	return ret;
> > 
> > That reads a tiny bit better to me, but it's probably majorly
> > subjective so I'm happy with existing patch if you prefer it.  
> 
> I think I prefer it as it is and this is because it would be in line
> with all the other PHY drivers which do this:
> 
> 	if (!(irq_status & int_enabled))
> 		return IRQ_NONE;
> 
> 	phy_trigger_machine(phydev);
> 

Okay, applied, thanks!