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SubjectRe: [PATCH] net: phy: Move interrupt check from phy_check to phy_interrupt
On Thu, Mar 08, 2018 at 05:29:05PM +0100, Andrew Lunn wrote:
> On Wed, Mar 07, 2018 at 04:50:42PM -0600, Brad Mouring wrote:
> > If multiple phys share the same interrupt (e.g. a multi-phy chip),
> > the first device registered is the only one checked as phy_interrupt
> > will always return IRQ_HANDLED if the first phydev is not halted.
> > Move the interrupt check into phy_interrupt and, if it was not this
> > phydev, return IRQ_NONE to allow other devices on this irq a chance
> > to check if it was their interrupt.
> >
> > Signed-off-by: Brad Mouring <brad.mouring@ni.com>
> > ---
> > drivers/net/phy/phy.c | 16 ++++++----------
> > 1 file changed, 6 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
> > index e3e29c2b028b..ff1aa815568f 100644
> > --- a/drivers/net/phy/phy.c
> > +++ b/drivers/net/phy/phy.c
> > @@ -632,6 +632,12 @@ static irqreturn_t phy_interrupt(int irq, void *phy_dat)
> > if (PHY_HALTED == phydev->state)
> > return IRQ_NONE; /* It can't be ours. */
> >
> > + if (phy_interrupt_is_valid(phydev)) {
>
> Hi Brad
>
> Is this check needed? Can phy_interrupt() be called for a PHY which
> does not have an interrupt?

Ah, fair point (and I guess a result of copy-pasting without
thinking), to address this and the next point...

> > + if (phydev->drv->did_interrupt &&
> > + !phydev->drv->did_interrupt(phydev))
> > + return IRQ_NONE;
> > + }
> > +
> > phy_change(phydev);
> >
> > return IRQ_HANDLED;
> > @@ -725,16 +731,6 @@ EXPORT_SYMBOL(phy_stop_interrupts);
> > */
> > void phy_change(struct phy_device *phydev)
> > {
> > - if (phy_interrupt_is_valid(phydev)) {
> > - if (phydev->drv->did_interrupt &&
> > - !phydev->drv->did_interrupt(phydev))
> > - return;
> > -
> > - if (phydev->state == PHY_HALTED)
> > - if (phy_disable_interrupts(phydev))
> > - goto phy_err;
> > - }
> > -
>
> phy_change() can also be called via phy_mac_interrupt(). I wonder if
> this change is going to break anything? Did you think about that?

Thanks for pointing this out. I'll post a v2 that (hopefully) address
both of these valid points.

Thanks,
Brad

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