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| author | Heiner Kallweit <hkallweit1@gmail.com> | 2020-03-01 23:36:09 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-18 09:17:46 +0300 |
| commit | 4d365c7b4747379bc489c126727431994c908796 (patch) | |
| tree | 62de09f9d583371990e580ca31aca17a8bcea86c | |
| parent | 7030138e3c6d778f1ecb30af70127ada2492f5a7 (diff) | |
| download | linux-4d365c7b4747379bc489c126727431994c908796.tar.xz | |
net: phy: avoid clearing PHY interrupts twice in irq handler
[ Upstream commit 249bc9744e165abe74ae326f43e9d70bad54c3b7 ]
On all PHY drivers that implement did_interrupt() reading the interrupt
status bits clears them. This means we may loose an interrupt that
is triggered between calling did_interrupt() and phy_clear_interrupt().
As part of the fix make it a requirement that did_interrupt() clears
the interrupt.
The Fixes tag refers to the first commit where the patch applies
cleanly.
Fixes: 49644e68f472 ("net: phy: add callback for custom interrupt handler to struct phy_driver")
Reported-by: Michael Walle <michael@walle.cc>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/net/phy/phy.c | 3 | ||||
| -rw-r--r-- | include/linux/phy.h | 1 |
2 files changed, 3 insertions, 1 deletions
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c index 105d389b58e7..ea890d802ffe 100644 --- a/drivers/net/phy/phy.c +++ b/drivers/net/phy/phy.c @@ -761,7 +761,8 @@ static irqreturn_t phy_interrupt(int irq, void *phy_dat) phy_trigger_machine(phydev); } - if (phy_clear_interrupt(phydev)) + /* did_interrupt() may have cleared the interrupt already */ + if (!phydev->drv->did_interrupt && phy_clear_interrupt(phydev)) goto phy_err; return IRQ_HANDLED; diff --git a/include/linux/phy.h b/include/linux/phy.h index 3d5d53313e6c..bf87c59a98bb 100644 --- a/include/linux/phy.h +++ b/include/linux/phy.h @@ -524,6 +524,7 @@ struct phy_driver { /* * Checks if the PHY generated an interrupt. * For multi-PHY devices with shared PHY interrupt pin + * Set interrupt bits have to be cleared. */ int (*did_interrupt)(struct phy_device *phydev); |