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authorMike Miller <mike.miller@hp.com>2011-10-20 22:19:17 +0200
committerJens Axboe <axboe@kernel.dk>2011-10-20 22:21:52 +0200
commitab5dbebe33e0c353e8545f09c34553ac3351dad6 (patch)
tree628b7956eac1b3a22850f0a2f2446ca29b69250b /drivers/block
parentb8d8bdfe31a67981bbc398a4886ccc67aff521d5 (diff)
cciss: add small delay when using PCI Power Management to reset for kump
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. Cc: stable@kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block')
-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 6da7edea700a..486f94ef24d4 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -4557,6 +4557,13 @@ 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;
}