target/iscsi: Fix op=disable + error handling cases in np_store_iser

Writing 0 when iser was not previously enabled, so succeed but do
nothing so that user-space code doesn't need a try: catch block
when ib_isert logic is not available.

Also, return actual error from add_network_portal using PTR_ERR
during op=enable failure.

Signed-off-by: Andy Grover <agrover@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/iscsi/iscsi_target_configfs.c b/drivers/target/iscsi/iscsi_target_configfs.c
index 13e9e71..fe4a5a2 100644 (file)
--- a/drivers/target/iscsi/iscsi_target_configfs.c
+++ b/drivers/target/iscsi/iscsi_target_configfs.c
@@ -155,7 +155,7 @@ static ssize_t lio_target_np_store_iser(
        struct iscsi_tpg_np *tpg_np_iser = NULL;
        char *endptr;
        u32 op;
-       int rc;
+       int rc = 0;
 
        op = simple_strtoul(page, &endptr, 0);
        if ((op != 1) && (op != 0)) {
@@ -174,22 +174,25 @@ static ssize_t lio_target_np_store_iser(
                return -EINVAL;
 
        if (op) {
-               int rc = request_module("ib_isert");
-               if (rc != 0)
+               rc = request_module("ib_isert");
+               if (rc != 0) {
                        pr_warn("Unable to request_module for ib_isert\n");
+                       rc = 0;
+               }
 
                tpg_np_iser = iscsit_tpg_add_network_portal(tpg, &np->np_sockaddr,
                                np->np_ip, tpg_np, ISCSI_INFINIBAND);
-               if (!tpg_np_iser || IS_ERR(tpg_np_iser))
+               if (IS_ERR(tpg_np_iser)) {
+                       rc = PTR_ERR(tpg_np_iser);
                        goto out;
+               }
        } else {
                tpg_np_iser = iscsit_tpg_locate_child_np(tpg_np, ISCSI_INFINIBAND);
-               if (!tpg_np_iser)
-                       goto out;
-
-               rc = iscsit_tpg_del_network_portal(tpg, tpg_np_iser);
-               if (rc < 0)
-                       goto out;
+               if (tpg_np_iser) {
+                       rc = iscsit_tpg_del_network_portal(tpg, tpg_np_iser);
+                       if (rc < 0)
+                               goto out;
+               }
        }
 
        printk("lio_target_np_store_iser() done, op: %d\n", op);
@@ -198,7 +201,7 @@ static ssize_t lio_target_np_store_iser(
        return count;
 out:
        iscsit_put_tpg(tpg);
-       return -EINVAL;
+       return rc;
 }
 
 TF_NP_BASE_ATTR(lio_target, iser, S_IRUGO | S_IWUSR);