[SCSI] ipr: Driver initialization fix for kexec/kdump
When kexec booting a kernel when the previous kernel did not
call ipr's shutdown method, the ipr adapter does not get
properly initialized, which can result in the ipr adapter
completing commands issued by the previous kernel. Fix ipr
to detect this scenario by reading the adapter's interrupt
mask register and the microprocessor interrupt register.
If the interrupt mask register indicates that interrupts
are enabled or the reset alert bit is set when the card is
probed, this means the card is in an unknown state and we
hard reset the card.
Signed-off-by: Brian King <brking@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index fa2cb358..b6714da 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -5887,7 +5887,12 @@
ENTER;
spin_lock_irqsave(ioa_cfg->host->host_lock, host_lock_flags);
dev_dbg(&ioa_cfg->pdev->dev, "ioa_cfg adx: 0x%p\n", ioa_cfg);
- _ipr_initiate_ioa_reset(ioa_cfg, ipr_reset_enable_ioa, IPR_SHUTDOWN_NONE);
+ if (ioa_cfg->needs_hard_reset) {
+ ioa_cfg->needs_hard_reset = 0;
+ ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NONE);
+ } else
+ _ipr_initiate_ioa_reset(ioa_cfg, ipr_reset_enable_ioa,
+ IPR_SHUTDOWN_NONE);
spin_unlock_irqrestore(ioa_cfg->host->host_lock, host_lock_flags);
wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload);
@@ -6264,6 +6269,7 @@
unsigned long ipr_regs_pci;
void __iomem *ipr_regs;
u32 rc = PCIBIOS_SUCCESSFUL;
+ volatile u32 mask, uproc;
ENTER;
@@ -6356,6 +6362,15 @@
goto cleanup_nomem;
}
+ /*
+ * If HRRQ updated interrupt is not masked, or reset alert is set,
+ * the card is in an unknown state and needs a hard reset
+ */
+ mask = readl(ioa_cfg->regs.sense_interrupt_mask_reg);
+ uproc = readl(ioa_cfg->regs.sense_uproc_interrupt_reg);
+ if ((mask & IPR_PCII_HRRQ_UPDATED) == 0 || (uproc & IPR_UPROCI_RESET_ALERT))
+ ioa_cfg->needs_hard_reset = 1;
+
ipr_mask_and_clear_interrupts(ioa_cfg, ~IPR_PCII_IOA_TRANS_TO_OPER);
rc = request_irq(pdev->irq, ipr_isr, SA_SHIRQ, IPR_NAME, ioa_cfg);