From patchwork Wed Jun 22 17:40:50 2016
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Subject: [v3] net: smsc911x: Fix bug where PHY interrupts are overwritten by 0
From: Jeremy Linton <jeremy.linton@arm.com>
X-Patchwork-Id: 639331
X-Patchwork-Delegate: davem@davemloft.net
Message-Id: <1466617250-27317-1-git-send-email-jeremy.linton@arm.com>
To: netdev@vger.kernel.org
Cc: steve.glendinning@shawell.net, andrew@lunn.ch,
sergei.shtylyov@cogentembedded.com, linux-kernel@vger.kernel.org,
stable@vger.kernel.org, pbrobinson@gmail.com,
mlangsdorf@redhat.com, steve.capper@arm.com
Date: Wed, 22 Jun 2016 12:40:50 -0500
By default, mdiobus_alloc() sets the PHYs to polling mode, but a
pointer size memcpy means that a couple IRQs end up being overwritten
with a value of 0. This means that PHY_POLL is disabled and results
in unpredictable behavior depending on the PHY's location on the
MDIO bus. Remove that memcpy and the now unused phy_irq member to
force the SMSC911x PHYs into polling mode 100% of the time.
Fixes: e7f4dc3536a4 ("mdio: Move allocation of interrupts into core")
Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
---
drivers/net/ethernet/smsc/smsc911x.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/drivers/net/ethernet/smsc/smsc911x.c b/drivers/net/ethernet/smsc/smsc911x.c
index 8af2556..b5ab5e1 100644
--- a/drivers/net/ethernet/smsc/smsc911x.c
+++ b/drivers/net/ethernet/smsc/smsc911x.c
@@ -116,7 +116,6 @@ struct smsc911x_data {
struct phy_device *phy_dev;
struct mii_bus *mii_bus;
- int phy_irq[PHY_MAX_ADDR];
unsigned int using_extphy;
int last_duplex;
int last_carrier;
@@ -1073,7 +1072,6 @@ static int smsc911x_mii_init(struct platform_device *pdev,
pdata->mii_bus->priv = pdata;
pdata->mii_bus->read = smsc911x_mii_read;
pdata->mii_bus->write = smsc911x_mii_write;
- memcpy(pdata->mii_bus->irq, pdata->phy_irq, sizeof(pdata->mii_bus));
pdata->mii_bus->parent = &pdev->dev;