iscsi-target: Avoid holding ->tpg_state_lock during param update

As originally reported by Jia-Ju, iscsit_tpg_enable_portal_group()
holds iscsi_portal_group->tpg_state_lock while updating AUTHMETHOD
via iscsi_update_param_value(), which performs a GFP_KERNEL
allocation.

However, since iscsit_tpg_enable_portal_group() is already protected
by iscsit_get_tpg() -> iscsi_portal_group->tpg_access_lock in it's
parent caller, ->tpg_state_lock only needs to be held when setting
TPG_STATE_ACTIVE.

Reported-by: Jia-Ju Bai <baijiaju1990@163.com>
Reviewed-by: Jia-Ju Bai <baijiaju1990@163.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/iscsi/iscsi_target_tpg.c b/drivers/target/iscsi/iscsi_target_tpg.c
index 2e7e08d..abaabba 100644 (file)
--- a/drivers/target/iscsi/iscsi_target_tpg.c
+++ b/drivers/target/iscsi/iscsi_target_tpg.c
@@ -311,11 +311,9 @@ int iscsit_tpg_enable_portal_group(struct iscsi_portal_group *tpg)
        struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
        int ret;
 
-       spin_lock(&tpg->tpg_state_lock);
        if (tpg->tpg_state == TPG_STATE_ACTIVE) {
                pr_err("iSCSI target portal group: %hu is already"
                        " active, ignoring request.\n", tpg->tpgt);
-               spin_unlock(&tpg->tpg_state_lock);
                return -EINVAL;
        }
        /*
@@ -324,10 +322,8 @@ int iscsit_tpg_enable_portal_group(struct iscsi_portal_group *tpg)
         * is enforced (as per default), and remove the NONE option.
         */
        param = iscsi_find_param_from_key(AUTHMETHOD, tpg->param_list);
-       if (!param) {
-               spin_unlock(&tpg->tpg_state_lock);
+       if (!param)
                return -EINVAL;
-       }
 
        if (tpg->tpg_attrib.authentication) {
                if (!strcmp(param->value, NONE)) {
@@ -341,6 +337,7 @@ int iscsit_tpg_enable_portal_group(struct iscsi_portal_group *tpg)
                        goto err;
        }
 
+       spin_lock(&tpg->tpg_state_lock);
        tpg->tpg_state = TPG_STATE_ACTIVE;
        spin_unlock(&tpg->tpg_state_lock);
 
@@ -353,7 +350,6 @@ int iscsit_tpg_enable_portal_group(struct iscsi_portal_group *tpg)
        return 0;
 
 err:
-       spin_unlock(&tpg->tpg_state_lock);
        return ret;
 }