s390/pci: update function handle after resume from hibernate

Function handles may change while the system was in hibernation
use list pci functions and update the function handles.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2 files changed, 39 insertions, 5 deletions

diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index a7ed6685e7fb..f17a8343e360 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -46,7 +46,7 @@
 
 /* list of all detected zpci devices */
 static LIST_HEAD(zpci_list);
-static DEFINE_MUTEX(zpci_list_lock);
+static DEFINE_SPINLOCK(zpci_list_lock);
 
 static void zpci_enable_irq(struct irq_data *data);
 static void zpci_disable_irq(struct irq_data *data);
@@ -88,14 +88,14 @@ struct zpci_dev *get_zdev_by_fid(u32 fid)
 {
 	struct zpci_dev *tmp, *zdev = NULL;
 
-	mutex_lock(&zpci_list_lock);
+	spin_lock(&zpci_list_lock);
 	list_for_each_entry(tmp, &zpci_list, entry) {
 		if (tmp->fid == fid) {
 			zdev = tmp;
 			break;
 		}
 	}
-	mutex_unlock(&zpci_list_lock);
+	spin_unlock(&zpci_list_lock);
 	return zdev;
 }
 
@@ -821,9 +821,9 @@ int zpci_create_device(struct zpci_dev *zdev)
 	if (rc)
 		goto out_disable;
 
-	mutex_lock(&zpci_list_lock);
+	spin_lock(&zpci_list_lock);
 	list_add_tail(&zdev->entry, &zpci_list);
-	mutex_unlock(&zpci_list_lock);
+	spin_unlock(&zpci_list_lock);
 
 	zpci_init_slot(zdev);
 
@@ -939,3 +939,8 @@ out:
 	return rc;
 }
 subsys_initcall_sync(pci_base_init);
+
+void zpci_rescan(void)
+{
+	clp_rescan_pci_devices_simple();
+}
diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c
index 3eaf63a6ecac..475563c3d1e4 100644
--- a/arch/s390/pci/pci_clp.c
+++ b/arch/s390/pci/pci_clp.c
@@ -319,6 +319,20 @@ static void __clp_rescan(struct clp_fh_list_entry *entry)
 	}
 }
 
+static void __clp_update(struct clp_fh_list_entry *entry)
+{
+	struct zpci_dev *zdev;
+
+	if (!entry->vendor_id)
+		return;
+
+	zdev = get_zdev_by_fid(entry->fid);
+	if (!zdev)
+		return;
+
+	zdev->fh = entry->fh;
+}
+
 int clp_scan_pci_devices(void)
 {
 	struct clp_req_rsp_list_pci *rrb;
@@ -348,3 +362,18 @@ int clp_rescan_pci_devices(void)
 	clp_free_block(rrb);
 	return rc;
 }
+
+int clp_rescan_pci_devices_simple(void)
+{
+	struct clp_req_rsp_list_pci *rrb;
+	int rc;
+
+	rrb = clp_alloc_block(GFP_NOWAIT);
+	if (!rrb)
+		return -ENOMEM;
+
+	rc = clp_list_pci(rrb, __clp_update);
+
+	clp_free_block(rrb);
+	return rc;
+}