Messages in this thread Patch in this message | | | From | David Decotigny <> | Subject | [PATCH 4/6] forcedeth: Acknowledge only interrupts that are being processed | Date | Wed, 18 May 2011 17:14:38 -0700 |
| |
From: Mike Ditto <mditto@google.com>
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 <decot@google.com> --- drivers/net/forcedeth.c | 13 ++++++++----- 1 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c index 7a6aa08..17e79de 100644 --- a/drivers/net/forcedeth.c +++ b/drivers/net/forcedeth.c @@ -3403,7 +3403,8 @@ 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, "%s: tx irq: %08x\n", dev->name, events); if (!(events & np->irqmask)) break; @@ -3514,7 +3515,8 @@ 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, "%s: rx irq: %08x\n", dev->name, events); if (!(events & np->irqmask)) break; @@ -3558,7 +3560,8 @@ 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, "%s: irq: %08x\n", dev->name, events); if (!(events & np->irqmask)) break; @@ -3622,10 +3625,10 @@ 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
| |