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[PATCH] ib: mthca: Always re-arm EQs in mthca_tavor_interrupt() 

We should always re-arm an event queue's interrupt in
mthca_tavor_interrupt() if the corresponding bit is set in the event cause
register (ECR), even if we didn't find any entries in the EQ.  If we don't,
then there's a window where we miss an EQ entry and then get stuck because
we don't get another EQ event.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Roland Dreier 2005-10-23 12:57:19 -07:00 committed by Linus Torvalds
parent 8d3b35914a
commit 75eeec2f3f
1 changed files with 11 additions and 10 deletions
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21
drivers/infiniband/hw/mthca/mthca_eq.c
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@ -396,20 +396,21 @@ static irqreturn_t mthca_tavor_interrupt(int irq, void *dev_ptr, struct pt_regs
writel(dev->eq_table.clr_mask, dev->eq_table.clr_int);
ecr = readl(dev->eq_regs.tavor.ecr_base + 4);
if (ecr) {
writel(ecr, dev->eq_regs.tavor.ecr_base +
MTHCA_ECR_CLR_BASE - MTHCA_ECR_BASE + 4);
if (!ecr)
return IRQ_NONE;
for (i = 0; i < MTHCA_NUM_EQ; ++i)
if (ecr & dev->eq_table.eq[i].eqn_mask &&
mthca_eq_int(dev, &dev->eq_table.eq[i])) {
writel(ecr, dev->eq_regs.tavor.ecr_base +
MTHCA_ECR_CLR_BASE - MTHCA_ECR_BASE + 4);
for (i = 0; i < MTHCA_NUM_EQ; ++i)
if (ecr & dev->eq_table.eq[i].eqn_mask) {
if (mthca_eq_int(dev, &dev->eq_table.eq[i]))
tavor_set_eq_ci(dev, &dev->eq_table.eq[i],
dev->eq_table.eq[i].cons_index);
tavor_eq_req_not(dev, dev->eq_table.eq[i].eqn);
}
}
tavor_eq_req_not(dev, dev->eq_table.eq[i].eqn);
}
return IRQ_RETVAL(ecr);
return IRQ_HANDLED;
}
static irqreturn_t mthca_tavor_msi_x_interrupt(int irq, void *eq_ptr,