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| author | Ayaz Abdulla <aabdulla@nvidia.com> | 2008-06-09 16:51:06 -0700 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2008-06-10 18:20:13 -0400 |
| commit | 4db0ee176e256444695ee2d7b004552e82fec987 (patch) | |
| tree | 1183874a62f3959921e568ade711b886d26603b2 /drivers/net | |
| parent | 2e761e0532a784816e7e822dbaaece8c5d4be14d (diff) | |
| download | kernel_samsung_smdk4412-4db0ee176e256444695ee2d7b004552e82fec987.zip kernel_samsung_smdk4412-4db0ee176e256444695ee2d7b004552e82fec987.tar.gz kernel_samsung_smdk4412-4db0ee176e256444695ee2d7b004552e82fec987.tar.bz2 | |
forcedeth: msi interrupts
Add a workaround for lost MSI interrupts. There is a race condition in
the HW in which future interrupts could be missed. The workaround is to
toggle the MSI irq mask.
Added cleanup based on comments from Andrew Morton.
Signed-off-by: Ayaz Abdulla <aabdulla@nvidia.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/forcedeth.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c index 9eca97f..2cb2447 100644 --- a/drivers/net/forcedeth.c +++ b/drivers/net/forcedeth.c @@ -3273,6 +3273,20 @@ static void nv_link_irq(struct net_device *dev) dprintk(KERN_DEBUG "%s: link change notification done.\n", dev->name); } +static void nv_msi_workaround(struct fe_priv *np) +{ + + /* Need to toggle the msi irq mask within the ethernet device, + * otherwise, future interrupts will not be detected. + */ + if (np->msi_flags & NV_MSI_ENABLED) { + u8 __iomem *base = np->base; + + writel(0, base + NvRegMSIIrqMask); + writel(NVREG_MSI_VECTOR_0_ENABLED, base + NvRegMSIIrqMask); + } +} + static irqreturn_t nv_nic_irq(int foo, void *data) { struct net_device *dev = (struct net_device *) data; @@ -3295,6 +3309,8 @@ static irqreturn_t nv_nic_irq(int foo, void *data) if (!(events & np->irqmask)) break; + nv_msi_workaround(np); + spin_lock(&np->lock); nv_tx_done(dev); spin_unlock(&np->lock); @@ -3410,6 +3426,8 @@ static irqreturn_t nv_nic_irq_optimized(int foo, void *data) if (!(events & np->irqmask)) break; + nv_msi_workaround(np); + spin_lock(&np->lock); nv_tx_done_optimized(dev, TX_WORK_PER_LOOP); spin_unlock(&np->lock); @@ -3750,6 +3768,8 @@ static irqreturn_t nv_nic_irq_test(int foo, void *data) if (!(events & NVREG_IRQ_TIMER)) return IRQ_RETVAL(0); + nv_msi_workaround(np); + spin_lock(&np->lock); np->intr_test = 1; spin_unlock(&np->lock); |