iser-target: Fix multi network portal shutdown regression

commit 2363d196686e44c0158929e7cf96c8589a24a81b upstream.

This patch fixes a iser-target specific regression introduced in
v3.15-rc6 with:

commit 14f4b54fe38f3a8f8392a50b951c8aa43b63687a
Author: Sagi Grimberg <sagig@mellanox.com>
Date:   Tue Apr 29 13:13:47 2014 +0300

    Target/iscsi,iser: Avoid accepting transport connections during stop stage

where the change to set iscsi_np->enabled = false within
iscsit_clear_tpg_np_login_thread() meant that a iscsi_np with
two iscsi_tpg_np exports would have it's parent iscsi_np set
to a disabled state, even if other iscsi_tpg_np exports still
existed.

This patch changes iscsit_clear_tpg_np_login_thread() to only
set iscsi_np->enabled = false when shutdown = true, and also
changes iscsit_del_np() to set iscsi_np->enabled = true when
iscsi_np->np_exports is non zero.

(Fix up context changes for v3.10.y - nab)

Cc: Sagi Grimberg <sagig@dev.mellanox.co.il>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 58c479d..68dbd88 100644 (file)
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -460,6 +460,7 @@ int iscsit_del_np(struct iscsi_np *np)
        spin_lock_bh(&np->np_thread_lock);
        np->np_exports--;
        if (np->np_exports) {
+               np->enabled = true;
                spin_unlock_bh(&np->np_thread_lock);
                return 0;
        }

diff --git a/drivers/target/iscsi/iscsi_target_tpg.c b/drivers/target/iscsi/iscsi_target_tpg.c
index 7ac798d..75a4e83 100644 (file)
--- a/drivers/target/iscsi/iscsi_target_tpg.c
+++ b/drivers/target/iscsi/iscsi_target_tpg.c
@@ -175,14 +175,16 @@ void iscsit_put_tpg(struct iscsi_portal_group *tpg)
 
 static void iscsit_clear_tpg_np_login_thread(
        struct iscsi_tpg_np *tpg_np,
-       struct iscsi_portal_group *tpg)
+       struct iscsi_portal_group *tpg,
+       bool shutdown)
 {
        if (!tpg_np->tpg_np) {
                pr_err("struct iscsi_tpg_np->tpg_np is NULL!\n");
                return;
        }
 
-       tpg_np->tpg_np->enabled = false;
+       if (shutdown)
+               tpg_np->tpg_np->enabled = false;
        iscsit_reset_np_thread(tpg_np->tpg_np, tpg_np, tpg);
 }
 
@@ -198,7 +200,7 @@ void iscsit_clear_tpg_np_login_threads(
                        continue;
                }
                spin_unlock(&tpg->tpg_np_lock);
-               iscsit_clear_tpg_np_login_thread(tpg_np, tpg);
+               iscsit_clear_tpg_np_login_thread(tpg_np, tpg, false);
                spin_lock(&tpg->tpg_np_lock);
        }
        spin_unlock(&tpg->tpg_np_lock);
@@ -521,7 +523,7 @@ static int iscsit_tpg_release_np(
        struct iscsi_portal_group *tpg,
        struct iscsi_np *np)
 {
-       iscsit_clear_tpg_np_login_thread(tpg_np, tpg);
+       iscsit_clear_tpg_np_login_thread(tpg_np, tpg, true);
 
        pr_debug("CORE[%s] - Removed Network Portal: %s:%hu,%hu on %s\n",
                tpg->tpg_tiqn->tiqn, np->np_ip, np->np_port, tpg->tpgt,