smsgiucv: guarantee single iucv connect in thaw
If another smsgiucv_app device exists, suspend / resume fails with
iucv path list corruption, because the same iucv_path_connect is
called twice.
The patch introduces a flag to save connect status of the smsgiucv
path to make sure iucv_path_connect in smsg_pm_restore_thaw is
called only once.
Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/s390/net/smsgiucv.c b/drivers/s390/net/smsgiucv.c
index 7049127..65e1cf1 100644
--- a/drivers/s390/net/smsgiucv.c
+++ b/drivers/s390/net/smsgiucv.c
@@ -47,6 +47,7 @@
static DEFINE_SPINLOCK(smsg_list_lock);
static LIST_HEAD(smsg_list);
+static int iucv_path_connected;
static int smsg_path_pending(struct iucv_path *, u8 ipvmid[8], u8 ipuser[16]);
static void smsg_message_pending(struct iucv_path *, struct iucv_message *);
@@ -142,8 +143,10 @@
#ifdef CONFIG_PM_DEBUG
printk(KERN_WARNING "smsg_pm_freeze\n");
#endif
- if (smsg_path)
+ if (smsg_path && iucv_path_connected) {
iucv_path_sever(smsg_path, NULL);
+ iucv_path_connected = 0;
+ }
return 0;
}
@@ -154,7 +157,7 @@
#ifdef CONFIG_PM_DEBUG
printk(KERN_WARNING "smsg_pm_restore_thaw\n");
#endif
- if (smsg_path) {
+ if (smsg_path && iucv_path_connected) {
memset(smsg_path, 0, sizeof(*smsg_path));
smsg_path->msglim = 255;
smsg_path->flags = 0;
@@ -165,6 +168,8 @@
printk(KERN_ERR
"iucv_path_connect returned with rc %i\n", rc);
#endif
+ if (!rc)
+ iucv_path_connected = 1;
cpcmd("SET SMSG IUCV", NULL, 0, NULL);
}
return 0;
@@ -214,6 +219,8 @@
NULL, NULL, NULL);
if (rc)
goto out_free_path;
+ else
+ iucv_path_connected = 1;
smsg_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
if (!smsg_dev) {
rc = -ENOMEM;