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hpsa: add small delay when using PCI Power Management to reset for kump

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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: Mike Miller <mike.miller@hp.com>
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Mike Miller 2011-10-21 08:19:43 +02:00 committed by Jens Axboe
parent ab5dbebe33
commit c4853efec6
1 changed files with 7 additions and 0 deletions
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7
drivers/scsi/hpsa.c
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@ -3283,6 +3283,13 @@ static int hpsa_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;
}