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[PATCH] ppc64: avoid PCI error reporting for empty slots 

06-eeh-empty-slot-error.patch

Performing PCI config-space reads to empty PCI slots can lead to reports of
"permanent failure" from the firmware. Ignore permanent failures on empty slots.

Signed-off-by: Linas Vepstas <linas@linas.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Linas Vepstas 2005-11-03 18:49:15 -06:00 committed by Paul Mackerras
parent df7242b115
commit 76e6faf7a3
1 changed files with 27 additions and 2 deletions
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29
arch/ppc64/kernel/eeh.c
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@ -617,7 +617,32 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
* In any case they must share a common PHB.
*/
ret = read_slot_reset_state(pdn, rets);
if (!(ret == 0 && rets[1] == 1 && (rets[0] == 2 || rets[0] == 4))) {
/* If the call to firmware failed, punt */
if (ret != 0) {
printk(KERN_WARNING "EEH: read_slot_reset_state() failed; rc=%d dn=%s\n",
ret, dn->full_name);
__get_cpu_var(false_positives)++;
return 0;
}
/* If EEH is not supported on this device, punt. */
if (rets[1] != 1) {
printk(KERN_WARNING "EEH: event on unsupported device, rc=%d dn=%s\n",
ret, dn->full_name);
__get_cpu_var(false_positives)++;
return 0;
}
/* If not the kind of error we know about, punt. */
if (rets[0] != 2 && rets[0] != 4 && rets[0] != 5) {
__get_cpu_var(false_positives)++;
return 0;
}
/* Note that config-io to empty slots may fail;
* we recognize empty because they don't have children. */
if ((rets[0] == 5) && (dn->child == NULL)) {
__get_cpu_var(false_positives)++;
return 0;
}
@ -650,7 +675,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
/* Most EEH events are due to device driver bugs. Having
* a stack trace will help the device-driver authors figure
* out what happened. So print that out. */
dump_stack();
if (rets[0] != 5) dump_stack();
schedule_work(&eeh_event_wq);
return 0;