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authorMike Miller <mike.miller@hp.com>2011-10-20 22:19:17 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2011-11-11 09:36:58 -0800
commitfa7e2a6289195e502003f59768837107a59678c0 (patch)
tree8157d84c2ae0d28d6f24800fddb100fed99d2f36
parent5432c16a57990f12d41f57ed99ba194c368c30d0 (diff)
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cciss: add small delay when using PCI Power Management to reset for kump
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>
-rw-r--r--drivers/block/cciss.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 8f4ef65..c2f9b3e 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -4533,6 +4533,13 @@ static int cciss_controller_hard_reset(struct pci_dev *pdev,
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;
}