ipr: Always initiate hard reset in kdump kernel
Anton Blanchard [Mon, 1 Aug 2011 09:43:45 +0000 (19:43 +1000)]
commit 5d7c20b7fa5c6ca19e871b4050e321c99d32bd43 upstream.

During kdump testing I noticed timeouts when initialising each IPR
adapter. While the driver has logic to detect an adapter in an
indeterminate state, it wasn't triggering and each adapter went
through a 5 minute timeout before finally going operational.

Some analysis showed the needs_hard_reset flag wasn't getting set.
We can check the reset_devices kernel parameter which is set by
kdump and force a full reset. This fixes the problem.

Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/scsi/ipr.c

index 8d63630..acbb924 100644 (file)
@@ -8812,7 +8812,7 @@ static int __devinit ipr_probe_ioa(struct pci_dev *pdev,
        uproc = readl(ioa_cfg->regs.sense_uproc_interrupt_reg32);
        if ((mask & IPR_PCII_HRRQ_UPDATED) == 0 || (uproc & IPR_UPROCI_RESET_ALERT))
                ioa_cfg->needs_hard_reset = 1;
-       if (interrupts & IPR_PCII_ERROR_INTERRUPTS)
+       if ((interrupts & IPR_PCII_ERROR_INTERRUPTS) || reset_devices)
                ioa_cfg->needs_hard_reset = 1;
        if (interrupts & IPR_PCII_IOA_UNIT_CHECKED)
                ioa_cfg->ioa_unit_checked = 1;