5.1-stable patches

[thirdparty/kernel/stable-queue.git] / releases / 3.1.1 / cciss-add-small-delay-when-using-pci-power-management-to-reset-for-kump.patch

From ab5dbebe33e0c353e8545f09c34553ac3351dad6 Mon Sep 17 00:00:00 2001
From: Mike Miller <mike.miller@hp.com>
Date: Thu, 20 Oct 2011 22:19:17 +0200
Subject: cciss: add small delay when using PCI Power Management to reset for kump

From: Mike Miller <mike.miller@hp.com>

commit ab5dbebe33e0c353e8545f09c34553ac3351dad6 upstream.

The P600 requires a small delay when changing states. Otherwise we may think
the board did not reset and we bail. This for kdump only and is particular
to the P600.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 drivers/block/cciss.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -4533,6 +4533,13 @@ static int cciss_controller_hard_reset(s
 		pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
 		pmcsr |= PCI_D0;
 		pci_write_config_word(pdev, pos + PCI_PM_CTRL, pmcsr);
+
+		/*
+		 * The P600 requires a small delay when changing states.
+		 * Otherwise we may think the board did not reset and we bail.
+		 * This for kdump only and is particular to the P600.
+		 */
+		msleep(500);
 	}
 	return 0;
 }