diff options
| author | Nathan Lynch <ntl@pobox.com> | 2006-09-21 14:25:34 -0500 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-09-22 15:19:58 +1000 |
| commit | d608df5c7da6ee968aa2ad43c596d5f8d4022299 (patch) | |
| tree | 421df8cc60c8570e89b15a74cd67b177ca64778c /arch | |
| parent | ed709d134deeaea7925a3d748b33ca7e58cc683d (diff) | |
| download | linux-d608df5c7da6ee968aa2ad43c596d5f8d4022299.tar.bz2 | |
[POWERPC] Maple U3 HT - reject inappropriate config space access
When there is a PCI-X mode 2 capable device behind the HT<->PCI-X
bridge, the pci core decides that the device has the extended 4K
config space, even though the bus is not operating in mode 2. This is
because the u3_ht pci ops silently accept offsets greater than 255 but
use only the 8 least significant bits, which means reading at offset
0x100 gets the data at offset 0x0, and causes confusion for lspci.
Reject accesses to configuration space offsets greater than 255.
Signed-off-by: Nathan Lynch <ntl@pobox.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/platforms/maple/pci.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/maple/pci.c b/arch/powerpc/platforms/maple/pci.c index dc05af5156a9..ec5c14f5ba49 100644 --- a/arch/powerpc/platforms/maple/pci.c +++ b/arch/powerpc/platforms/maple/pci.c @@ -213,6 +213,9 @@ static int u3_ht_read_config(struct pci_bus *bus, unsigned int devfn, if (hose == NULL) return PCIBIOS_DEVICE_NOT_FOUND; + if (offset > 0xff) + return PCIBIOS_BAD_REGISTER_NUMBER; + addr = u3_ht_cfg_access(hose, bus->number, devfn, offset); if (!addr) return PCIBIOS_DEVICE_NOT_FOUND; @@ -245,6 +248,9 @@ static int u3_ht_write_config(struct pci_bus *bus, unsigned int devfn, if (hose == NULL) return PCIBIOS_DEVICE_NOT_FOUND; + if (offset > 0xff) + return PCIBIOS_BAD_REGISTER_NUMBER; + addr = u3_ht_cfg_access(hose, bus->number, devfn, offset); if (!addr) return PCIBIOS_DEVICE_NOT_FOUND; |