From a5442ba4a428081ebac7090f46c62ffaa17ca951 Mon Sep 17 00:00:00 2001 From: Wayne Boyer Date: Tue, 17 May 2011 09:18:53 -0700 Subject: [PATCH] [SCSI] ipr: fix possible false positive detection of stuck interrupt If the driver is getting flooded with interrupts, there's a possibility that the interrupt service routine could falsely detect a stuck interrupt condition and reset the adapter. This patch changes the logic such that the routine will loop back into the command processing code one more time after detecting the stuck interrupt signature. If there are no commands to process after that pass, and the interrupt is still not cleared, then the driver will print the "Error clearing HRRQ" message and reset the adapter. Signed-off-by: Wayne Boyer Acked-by: Brian King Signed-off-by: James Bottomley --- drivers/scsi/ipr.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c index 12868ca..888086c 100644 --- a/drivers/scsi/ipr.c +++ b/drivers/scsi/ipr.c @@ -5149,21 +5149,21 @@ static irqreturn_t ipr_isr(int irq, void *devp) if (ipr_cmd != NULL) { /* Clear the PCI interrupt */ + num_hrrq = 0; do { writel(IPR_PCII_HRRQ_UPDATED, ioa_cfg->regs.clr_interrupt_reg32); int_reg = readl(ioa_cfg->regs.sense_interrupt_reg32); } while (int_reg & IPR_PCII_HRRQ_UPDATED && num_hrrq++ < IPR_MAX_HRRQ_RETRIES); - if (int_reg & IPR_PCII_HRRQ_UPDATED) { - ipr_isr_eh(ioa_cfg, "Error clearing HRRQ"); - spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags); - return IRQ_HANDLED; - } - } else if (rc == IRQ_NONE && irq_none == 0) { int_reg = readl(ioa_cfg->regs.sense_interrupt_reg32); irq_none++; + } else if (num_hrrq == IPR_MAX_HRRQ_RETRIES && + int_reg & IPR_PCII_HRRQ_UPDATED) { + ipr_isr_eh(ioa_cfg, "Error clearing HRRQ"); + spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags); + return IRQ_HANDLED; } else break; } -- 2.7.4