linux-kernel - [054/107] [SCSI] ipr: Always initiate hard reset in kdump kernel

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Date:	Wed, 02 Nov 2011 15:14:20 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Anton Blanchard <anton@...ba.org>,
	Brian King <brking@...ux.vnet.ibm.com>,
	James Bottomley <JBottomley@...allels.com>
Subject: [054/107] [SCSI] ipr: Always initiate hard reset in kdump kernel

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Anton Blanchard <anton@...ba.org>

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@...ba.org>
Acked-by: Brian King <brking@...ux.vnet.ibm.com>
Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/scsi/ipr.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -7668,7 +7668,7 @@ static int __devinit ipr_probe_ioa(struc
 	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;
-	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;


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