提交 25daeb55 编写于 作者: D Dean Nelson 提交者: Jesse Barnes

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: NDean Nelson <dnelson@redhat.com>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
上级 fc7f99cf
......@@ -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);
......
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