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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>
This commit is contained in:
Ayaz Abdulla 2008-06-09 16:51:06 -07:00 committed by Jeff Garzik
parent 2e761e0532
commit 4db0ee176e
1 changed files with 20 additions and 0 deletions
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20
drivers/net/forcedeth.c
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@ -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);