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authorAyaz Abdulla <aabdulla@nvidia.com>2008-06-09 19:51:06 -0400
committerJeff Garzik <jgarzik@redhat.com>2008-06-10 18:20:13 -0400
commit4db0ee176e256444695ee2d7b004552e82fec987 (patch)
tree1183874a62f3959921e568ade711b886d26603b2 /drivers/net/forcedeth.c
parent2e761e0532a784816e7e822dbaaece8c5d4be14d (diff)
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/forcedeth.c')
-rw-r--r--drivers/net/forcedeth.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
index 9eca97fb0a54..2cb244763292 100644
--- a/drivers/net/forcedeth.c
+++ b/drivers/net/forcedeth.c
@@ -3273,6 +3273,20 @@ static void nv_link_irq(struct net_device *dev)
3273 dprintk(KERN_DEBUG "%s: link change notification done.\n", dev->name); 3273 dprintk(KERN_DEBUG "%s: link change notification done.\n", dev->name);
3274} 3274}
3275 3275
3276static void nv_msi_workaround(struct fe_priv *np)
3277{
3278
3279 /* Need to toggle the msi irq mask within the ethernet device,
3280 * otherwise, future interrupts will not be detected.
3281 */
3282 if (np->msi_flags & NV_MSI_ENABLED) {
3283 u8 __iomem *base = np->base;
3284
3285 writel(0, base + NvRegMSIIrqMask);
3286 writel(NVREG_MSI_VECTOR_0_ENABLED, base + NvRegMSIIrqMask);
3287 }
3288}
3289
3276static irqreturn_t nv_nic_irq(int foo, void *data) 3290static irqreturn_t nv_nic_irq(int foo, void *data)
3277{ 3291{
3278 struct net_device *dev = (struct net_device *) data; 3292 struct net_device *dev = (struct net_device *) data;
@@ -3295,6 +3309,8 @@ static irqreturn_t nv_nic_irq(int foo, void *data)
3295 if (!(events & np->irqmask)) 3309 if (!(events & np->irqmask))
3296 break; 3310 break;
3297 3311
3312 nv_msi_workaround(np);
3313
3298 spin_lock(&np->lock); 3314 spin_lock(&np->lock);
3299 nv_tx_done(dev); 3315 nv_tx_done(dev);
3300 spin_unlock(&np->lock); 3316 spin_unlock(&np->lock);
@@ -3410,6 +3426,8 @@ static irqreturn_t nv_nic_irq_optimized(int foo, void *data)
3410 if (!(events & np->irqmask)) 3426 if (!(events & np->irqmask))
3411 break; 3427 break;
3412 3428
3429 nv_msi_workaround(np);
3430
3413 spin_lock(&np->lock); 3431 spin_lock(&np->lock);
3414 nv_tx_done_optimized(dev, TX_WORK_PER_LOOP); 3432 nv_tx_done_optimized(dev, TX_WORK_PER_LOOP);
3415 spin_unlock(&np->lock); 3433 spin_unlock(&np->lock);
@@ -3750,6 +3768,8 @@ static irqreturn_t nv_nic_irq_test(int foo, void *data)
3750 if (!(events & NVREG_IRQ_TIMER)) 3768 if (!(events & NVREG_IRQ_TIMER))
3751 return IRQ_RETVAL(0); 3769 return IRQ_RETVAL(0);
3752 3770
3771 nv_msi_workaround(np);
3772
3753 spin_lock(&np->lock); 3773 spin_lock(&np->lock);
3754 np->intr_test = 1; 3774 np->intr_test = 1;
3755 spin_unlock(&np->lock); 3775 spin_unlock(&np->lock);