| Date | Tue, 30 Mar 2010 15:56:02 -0700 | From | Greg KH <> | Subject | [084/116] PCI: fix return value from pcix_get_max_mmrbc() |
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2.6.32-stable review patch. If anyone has any objections, please let us know.
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From: Dean Nelson <dnelson@redhat.com>
commit 25daeb550b69e89aff59bc6a84218a12b5203531 upstream.
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.
Signed-off-by: Dean Nelson <dnelson@redhat.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/pci/pci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -2361,7 +2361,7 @@ int pcix_get_max_mmrbc(struct pci_dev *d 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);
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