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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>
This commit is contained in:
Mike Miller 2011-10-20 22:19:17 +02:00 committed by Jens Axboe
parent b8d8bdfe31
commit ab5dbebe33
1 changed files with 7 additions and 0 deletions
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7
drivers/block/cciss.c
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@ -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;
}