From 3e7c469f07ff14cbf9a814739e1fc99a863e0943 Mon Sep 17 00:00:00 2001 From: Joe Chou <Joe.Chou@rdc.com.tw> Date: Mon, 22 Dec 2008 19:40:02 -0800 Subject: [PATCH] r6040: save and restore MIER correctly in the interrupt routine This patch saves the MIER register contents before treating interrupts, then restores them correcty at the end of the interrupt routine. Signed-off-by: Joe Chou <Joe.Chou@rdc.com.tw> Signed-off-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: David S. Miller <davem@davemloft.net> --- drivers/net/r6040.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/net/r6040.c b/drivers/net/r6040.c index cc5e316de571..990612328ca1 100644 --- a/drivers/net/r6040.c +++ b/drivers/net/r6040.c @@ -680,8 +680,10 @@ static irqreturn_t r6040_interrupt(int irq, void *dev_id) struct net_device *dev = dev_id; struct r6040_private *lp = netdev_priv(dev); void __iomem *ioaddr = lp->base; - u16 status; + u16 misr, status; + /* Save MIER */ + misr = ioread16(ioaddr + MIER); /* Mask off RDC MAC interrupt */ iowrite16(MSK_INT, ioaddr + MIER); /* Read MISR status and clear */ @@ -701,7 +703,7 @@ static irqreturn_t r6040_interrupt(int irq, void *dev_id) dev->stats.rx_fifo_errors++; /* Mask off RX interrupt */ - iowrite16(ioread16(ioaddr + MIER) & ~RX_INTS, ioaddr + MIER); + misr &= ~RX_INTS; netif_rx_schedule(dev, &lp->napi); } @@ -709,6 +711,9 @@ static irqreturn_t r6040_interrupt(int irq, void *dev_id) if (status & TX_INTS) r6040_tx(dev); + /* Restore RDC MAC interrupt */ + iowrite16(misr, ioaddr + MIER); + return IRQ_HANDLED; } -- GitLab