From: Roland Dreier Date: Sun, 23 Oct 2005 19:57:19 +0000 (-0700) Subject: [PATCH] ib: mthca: Always re-arm EQs in mthca_tavor_interrupt() X-Git-Tag: v2.6.14~32 X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=75eeec2f3fd9e8a16777219ebf1bf8395845faa7;p=pandora-kernel.git [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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,