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

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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>
This commit is contained in:
Nicholas Bellinger 2017-06-01 20:21:33 -07:00
parent 9ae0e9ade5
commit eceb4459df
1 changed files with 2 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/target/iscsi/iscsi_target_tpg.c
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@ -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;
}