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-rw-r--r--arch/powerpc/platforms/pseries/eeh.c19
1 files changed, 16 insertions, 3 deletions
diff --git a/arch/powerpc/platforms/pseries/eeh.c b/arch/powerpc/platforms/pseries/eeh.c
index da6e5362e7c..9437f48cc9e 100644
--- a/arch/powerpc/platforms/pseries/eeh.c
+++ b/arch/powerpc/platforms/pseries/eeh.c
@@ -747,6 +747,7 @@ struct eeh_early_enable_info {
/* Enable eeh for the given device node. */
static void *early_enable_eeh(struct device_node *dn, void *data)
{
+ unsigned int rets[3];
struct eeh_early_enable_info *info = data;
int ret;
const char *status = get_property(dn, "status", NULL);
@@ -803,16 +804,14 @@ static void *early_enable_eeh(struct device_node *dn, void *data)
regs[0], info->buid_hi, info->buid_lo,
EEH_ENABLE);
+ enable = 0;
if (ret == 0) {
- eeh_subsystem_enabled = 1;
- pdn->eeh_mode |= EEH_MODE_SUPPORTED;
pdn->eeh_config_addr = regs[0];
/* If the newer, better, ibm,get-config-addr-info is supported,
* then use that instead. */
pdn->eeh_pe_config_addr = 0;
if (ibm_get_config_addr_info != RTAS_UNKNOWN_SERVICE) {
- unsigned int rets[2];
ret = rtas_call (ibm_get_config_addr_info, 4, 2, rets,
pdn->eeh_config_addr,
info->buid_hi, info->buid_lo,
@@ -820,6 +819,20 @@ static void *early_enable_eeh(struct device_node *dn, void *data)
if (ret == 0)
pdn->eeh_pe_config_addr = rets[0];
}
+
+ /* Some older systems (Power4) allow the
+ * ibm,set-eeh-option call to succeed even on nodes
+ * where EEH is not supported. Verify support
+ * explicitly. */
+ ret = read_slot_reset_state(pdn, rets);
+ if ((ret == 0) && (rets[1] == 1))
+ enable = 1;
+ }
+
+ if (enable) {
+ eeh_subsystem_enabled = 1;
+ pdn->eeh_mode |= EEH_MODE_SUPPORTED;
+
#ifdef DEBUG
printk(KERN_DEBUG "EEH: %s: eeh enabled, config=%x pe_config=%x\n",
dn->full_name, pdn->eeh_config_addr, pdn->eeh_pe_config_addr);