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| author | Dean Nelson <dnelson@redhat.com> | 2010-03-09 22:26:40 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-04-01 15:58:44 -0700 |
| commit | aa6760432ad3a02d191b61bf224bb36f952fa0c9 (patch) | |
| tree | 5c4ac5f0f557323c0cb4c916a93c752fd490b3e1 /drivers | |
| parent | 2a3046b3ac262a2af01b857071401200f876da65 (diff) | |
| download | lwn-aa6760432ad3a02d191b61bf224bb36f952fa0c9.tar.gz lwn-aa6760432ad3a02d191b61bf224bb36f952fa0c9.zip | |
PCI: fix return value from pcix_get_max_mmrbc()
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pci/pci.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 64777220a719..f16204b293a4 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -2361,7 +2361,7 @@ 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); |