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authorRoland Dreier <rolandd@cisco.com>2005-10-23 12:57:19 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-23 16:38:39 -0700
commit75eeec2f3fd9e8a16777219ebf1bf8395845faa7 (patch)
tree347883a070001786aafdbf284d8d6971ab44dbff
parent8d3b35914aa54232b27e6a2b57d84092aadc5e86 (diff)
downloadlinux-75eeec2f3fd9e8a16777219ebf1bf8395845faa7.tar.bz2
[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>
-rw-r--r--drivers/infiniband/hw/mthca/mthca_eq.c21
1 files changed, 11 insertions, 10 deletions
diff --git a/drivers/infiniband/hw/mthca/mthca_eq.c b/drivers/infiniband/hw/mthca/mthca_eq.c
index c81fa8e975ef..8dfafda5ed24 100644
--- a/drivers/infiniband/hw/mthca/mthca_eq.c
+++ b/drivers/infiniband/hw/mthca/mthca_eq.c
@@ -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,