From 293da76b3d4c2f362f906bce8c5d2e053bdf8d44 Mon Sep 17 00:00:00 2001 From: Jake Moilanen Date: Thu, 9 Jun 2005 09:31:12 -0500 Subject: [PATCH] [PATCH] ppc64: PCI device-node failure detection OpenFirmware marks devices as failed in the device-tree when a hardware problem is detected. The kernel needs to fail config reads/writes to prevent a kernel crash when incorrect data is read. This patch validates that the device-node is not marked "fail" when config space reads/writes are attempted. Signed-off-by: Jake Moilanen Signed-off-by: Paul Mackerras --- arch/ppc64/kernel/rtas_pci.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/arch/ppc64/kernel/rtas_pci.c b/arch/ppc64/kernel/rtas_pci.c index 1048817befb..1dccadaddd1 100644 --- a/arch/ppc64/kernel/rtas_pci.c +++ b/arch/ppc64/kernel/rtas_pci.c @@ -58,6 +58,21 @@ static int config_access_valid(struct device_node *dn, int where) return 0; } +static int of_device_available(struct device_node * dn) +{ + char * status; + + status = get_property(dn, "status", NULL); + + if (!status) + return 1; + + if (!strcmp(status, "okay")) + return 1; + + return 0; +} + static int rtas_read_config(struct device_node *dn, int where, int size, u32 *val) { int returnval = -1; @@ -103,7 +118,7 @@ static int rtas_pci_read_config(struct pci_bus *bus, /* Search only direct children of the bus */ for (dn = busdn->child; dn; dn = dn->sibling) - if (dn->devfn == devfn) + if (dn->devfn == devfn && of_device_available(dn)) return rtas_read_config(dn, where, size, val); return PCIBIOS_DEVICE_NOT_FOUND; } @@ -146,7 +161,7 @@ static int rtas_pci_write_config(struct pci_bus *bus, /* Search only direct children of the bus */ for (dn = busdn->child; dn; dn = dn->sibling) - if (dn->devfn == devfn) + if (dn->devfn == devfn && of_device_available(dn)) return rtas_write_config(dn, where, size, val); return PCIBIOS_DEVICE_NOT_FOUND; } -- 2.20.1