s390/pci: prevent inadvertently triggered bus scans
Initialization and scanning of the pci bus is omitted on older
machines without pci support or if pci=off was specified. Remember
the fact that we ran without pci support and prevent further bus
scans during resume from hibernate or after receiving hotplug
notifications.
Reported-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index bf7c73d..e3265b5 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -920,6 +920,7 @@
}
static unsigned int s390_pci_probe;
+static unsigned int s390_pci_initialized;
char * __init pcibios_setup(char *str)
{
@@ -930,6 +931,11 @@
return str;
}
+bool zpci_is_enabled(void)
+{
+ return s390_pci_initialized;
+}
+
static int __init pci_base_init(void)
{
int rc;
@@ -961,6 +967,7 @@
if (rc)
goto out_find;
+ s390_pci_initialized = 1;
return 0;
out_find:
@@ -978,5 +985,6 @@
void zpci_rescan(void)
{
- clp_rescan_pci_devices_simple();
+ if (zpci_is_enabled())
+ clp_rescan_pci_devices_simple();
}