korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-25 21:24:08 +08:00
Code Issues Packages Projects Releases Wiki Activity

[SCSI] ipr: fix possible false positive detection of stuck interrupt

Browse Source 
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 <wayneb@linux.vnet.ibm.com>
Acked-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <jbottomley@parallels.com>
This commit is contained in:
Wayne Boyer 2011-05-17 09:18:53 -07:00 committed by James Bottomley
parent d85e607b34
commit a5442ba4a4
1 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/scsi/ipr.c
View File

@ -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;
}