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PCI: fix return value from pcix_get_max_mmrbc() 

For the PCI_X_STATUS register, pcix_get_max_mmrbc() is returning an incorrect
value, which is based on:

	(stat & PCI_X_STATUS_MAX_READ) >> 12

Valid return values are 512, 1024, 2048, 4096, which correspond to a 'stat'
(masked and right shifted by 21) of 0, 1, 2, 3, respectively.

A right shift by 11 would generate the correct return value when 'stat' (masked
and right shifted by 21) has a value of 1 or 2. But for a value of 0 or 3 it's
not possible to generate the correct return value by only right shifting.

Fix is based on pcix_get_mmrbc()'s similar dealings with the PCI_X_CMD register.

Cc: stable@kernel.org
Signed-off-by: Dean Nelson <dnelson@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Dean Nelson 2010-03-09 22:26:40 -05:00 committed by Jesse Barnes
parent fc7f99cf36
commit 25daeb550b
1 changed files with 1 additions and 1 deletions
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2
drivers/pci/pci.c
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@ -2587,7 +2587,7 @@ int pcix_get_max_mmrbc(struct pci_dev *dev)
if (err)
return -EINVAL;
return (stat & PCI_X_STATUS_MAX_READ) >> 12;
return 512 << ((stat & PCI_X_STATUS_MAX_READ) >> 21);
}
EXPORT_SYMBOL(pcix_get_max_mmrbc);