diff options
| author | Ayaz Abdulla <aabdulla@nvidia.com> | 2009-03-05 09:02:34 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-03-10 13:29:51 +0100 |
| commit | 1b2bb76f575699eff3f58b18dcfebf5d3b1f6ddb (patch) | |
| tree | 19f8327f23dd7137b3b67588b3484d6f8dc62ade /drivers/net | |
| parent | forcedeth: performance changes (diff) | |
| download | linux-1b2bb76f575699eff3f58b18dcfebf5d3b1f6ddb.tar.xz linux-1b2bb76f575699eff3f58b18dcfebf5d3b1f6ddb.zip | |
forcedeth: fix irq clearing and napi spin lock changes
This patch clears the irqstatus register with the exact same events it
has read from it. Since the read-write operation is not atomic, a new
irqstatus bit could have been set in between these operations and would
then be cleared accidentally.
Secondly, we now don't need any spin lock protection when
scheduling/completing napi poll as the isr will not execute anymore (as
we turn off all interrupts now).
Signed-off-by: Ayaz Abdulla <aabdulla@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/forcedeth.c | 18 |
1 files changed, 4 insertions, 14 deletions
diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c index 28fc3357268a..514aaf189af9 100644 --- a/drivers/net/forcedeth.c +++ b/drivers/net/forcedeth.c @@ -3464,10 +3464,10 @@ static irqreturn_t nv_nic_irq(int foo, void *data) if (!(np->msi_flags & NV_MSI_X_ENABLED)) { np->events = readl(base + NvRegIrqStatus); - writel(NVREG_IRQSTAT_MASK, base + NvRegIrqStatus); + writel(np->events, base + NvRegIrqStatus); } else { np->events = readl(base + NvRegMSIXIrqStatus); - writel(NVREG_IRQSTAT_MASK, base + NvRegMSIXIrqStatus); + writel(np->events, base + NvRegMSIXIrqStatus); } dprintk(KERN_DEBUG "%s: irq: %08x\n", dev->name, np->events); if (!(np->events & np->irqmask)) @@ -3476,15 +3476,12 @@ static irqreturn_t nv_nic_irq(int foo, void *data) nv_msi_workaround(np); #ifdef CONFIG_FORCEDETH_NAPI - spin_lock(&np->lock); napi_schedule(&np->napi); /* Disable furthur irq's (msix not enabled with napi) */ writel(0, base + NvRegIrqMask); - spin_unlock(&np->lock); - #else do { @@ -3568,10 +3565,10 @@ static irqreturn_t nv_nic_irq_optimized(int foo, void *data) if (!(np->msi_flags & NV_MSI_X_ENABLED)) { np->events = readl(base + NvRegIrqStatus); - writel(NVREG_IRQSTAT_MASK, base + NvRegIrqStatus); + writel(np->events, base + NvRegIrqStatus); } else { np->events = readl(base + NvRegMSIXIrqStatus); - writel(NVREG_IRQSTAT_MASK, base + NvRegMSIXIrqStatus); + writel(np->events, base + NvRegMSIXIrqStatus); } dprintk(KERN_DEBUG "%s: irq: %08x\n", dev->name, np->events); if (!(np->events & np->irqmask)) @@ -3580,15 +3577,12 @@ static irqreturn_t nv_nic_irq_optimized(int foo, void *data) nv_msi_workaround(np); #ifdef CONFIG_FORCEDETH_NAPI - spin_lock(&np->lock); napi_schedule(&np->napi); /* Disable furthur irq's (msix not enabled with napi) */ writel(0, base + NvRegIrqMask); - spin_unlock(&np->lock); - #else do { @@ -3758,13 +3752,9 @@ static int nv_napi_poll(struct napi_struct *napi, int budget) if (rx_work < budget) { /* re-enable interrupts (msix not enabled in napi) */ - spin_lock_irqsave(&np->lock, flags); - __napi_complete(napi); writel(np->irqmask, base + NvRegIrqMask); - - spin_unlock_irqrestore(&np->lock, flags); } return rx_work; } |