[PATCH net v5 2/5] forcedeth: Acknowledge only interrupts that are being processed
From: David Decotigny <hidden>
Date: 2011-11-06 00:39:12
Also in:
lkml
Subsystem:
forcedeth gigabit ethernet driver, networking drivers, the rest · Maintainers:
Rain River, Zhu Yanjun, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Mike Ditto <redacted> This is to avoid a race, accidentally acknowledging an interrupt that we didn't notice and won't immediately process. This is based solely on code inspection; it is not known if there was an actual bug here. Signed-off-by: David Decotigny <redacted> --- drivers/net/ethernet/nvidia/forcedeth.c | 13 ++++++++----- 1 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/nvidia/forcedeth.c b/drivers/net/ethernet/nvidia/forcedeth.c
index 344cb5f..b7cf4b6 100644
--- a/drivers/net/ethernet/nvidia/forcedeth.c
+++ b/drivers/net/ethernet/nvidia/forcedeth.c@@ -3398,7 +3398,8 @@ static irqreturn_t nv_nic_irq_tx(int foo, void *data) for (i = 0;; i++) { events = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQ_TX_ALL; - writel(NVREG_IRQ_TX_ALL, base + NvRegMSIXIrqStatus); + writel(events, base + NvRegMSIXIrqStatus); + netdev_dbg(dev, "tx irq events: %08x\n", events); if (!(events & np->irqmask)) break;
@@ -3509,7 +3510,8 @@ static irqreturn_t nv_nic_irq_rx(int foo, void *data) for (i = 0;; i++) { events = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQ_RX_ALL; - writel(NVREG_IRQ_RX_ALL, base + NvRegMSIXIrqStatus); + writel(events, base + NvRegMSIXIrqStatus); + netdev_dbg(dev, "rx irq events: %08x\n", events); if (!(events & np->irqmask)) break;
@@ -3553,7 +3555,8 @@ static irqreturn_t nv_nic_irq_other(int foo, void *data) for (i = 0;; i++) { events = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQ_OTHER; - writel(NVREG_IRQ_OTHER, base + NvRegMSIXIrqStatus); + writel(events, base + NvRegMSIXIrqStatus); + netdev_dbg(dev, "irq events: %08x\n", events); if (!(events & np->irqmask)) break;
@@ -3617,10 +3620,10 @@ static irqreturn_t nv_nic_irq_test(int foo, void *data) if (!(np->msi_flags & NV_MSI_X_ENABLED)) { events = readl(base + NvRegIrqStatus) & NVREG_IRQSTAT_MASK; - writel(NVREG_IRQ_TIMER, base + NvRegIrqStatus); + writel(events & NVREG_IRQ_TIMER, base + NvRegIrqStatus); } else { events = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQSTAT_MASK; - writel(NVREG_IRQ_TIMER, base + NvRegMSIXIrqStatus); + writel(events & NVREG_IRQ_TIMER, base + NvRegMSIXIrqStatus); } pci_push(base); if (!(events & NVREG_IRQ_TIMER))
--
1.7.3.1