netdev - Re: [PATCH] net: smsc911x: If PHY doesn't have an interrupt then POLL

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Date:	Tue, 14 Jun 2016 22:12:43 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	Jeremy Linton <jeremy.linton@....com>, netdev@...r.kernel.org,
	steve.glendinning@...well.net
Subject: Re: [PATCH] net: smsc911x: If PHY doesn't have an interrupt then POLL

On Tue, Jun 14, 2016 at 10:49:20PM +0300, Sergei Shtylyov wrote:
> On 06/14/2016 10:27 PM, Sergei Shtylyov wrote:
> 
> >>>If the interrupt configuration isn't set and we are using the
> >>>internal phy, then we need to poll the phy to reliably detect
> >>>phy state changes.
> >>>
> >>>Signed-off-by: Jeremy Linton <jeremy.linton@....com>
> >>>---
> >>> drivers/net/ethernet/smsc/smsc911x.c | 3 +++
> >>> 1 file changed, 3 insertions(+)
> >>>
> >>>diff --git a/drivers/net/ethernet/smsc/smsc911x.c
> >>>b/drivers/net/ethernet/smsc/smsc911x.c
> >>>index 8af2556..369dc7d 100644
> >>>--- a/drivers/net/ethernet/smsc/smsc911x.c
> >>>+++ b/drivers/net/ethernet/smsc/smsc911x.c
> >>>@@ -1020,6 +1020,9 @@ static int smsc911x_mii_probe(struct net_device *dev)
> >>>         return -ENODEV;
> >>>     }
> >>>
> >>>+    if ((!phydev->irq) && (!pdata->using_extphy))
> >>
> >>   Inner parens aren't needed at all.
> >
> >   Hm, 'phydev->irq' shouldn't be 0 in the first place. It seems to me we
> >should correctly initialize 'pdata->phy_irq[]' in smsc911x_mii_init()...

Hi Sergei

The mdio layer, when it allocates the mdiobus structure, will
initialise all the phy interrupts to polling.

>    And looking at that array, I doubt it's really useful for
> anything... And the memcpy() there seems buggy as well -- it copies
> just 4 bytes of this array to 'pdata->mii_bus->irq'.

0 is not a valid interrupt. So it should probably loop over the array
and copy any which are not 0 into pdata->mii_bus->irq[].

    Andrew