linux-kernel - [209/262] cciss: add small delay when using PCI Power Management to reset for kump

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Message-Id: <20111109212721.603387901@clark.kroah.org>
Date:	Wed, 09 Nov 2011 13:28:51 -0800
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, Jens Axboe <axboe@...nel.dk>
Subject: [209/262] cciss: add small delay when using PCI Power Management to reset for kump

3.0-stable review patch.  If anyone has any objections, please let me know.

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

From: Mike Miller <mike.miller@...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@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.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;
 }


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