diff mbox series

[v7,2/3] blk-cgroup: Return -ENOMEM directly in blkcg_css_alloc() error path

Message ID 20221003154459.207538-3-longman@redhat.com (mailing list archive)
State New, archived
Headers show
Series blk-cgroup: Optimize blkcg_rstat_flush() | expand

Commit Message

Waiman Long Oct. 3, 2022, 3:44 p.m. UTC 
For blkcg_css_alloc(), the only error that will be returned is -ENOMEM.
Simplify error handling code by returning this error directly instead
of setting an intermediate "ret" variable.

Signed-off-by: Waiman Long <longman@redhat.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
---
 block/blk-cgroup.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

Comments

Tejun Heo Oct. 3, 2022, 4:40 p.m. UTC | #1 
On Mon, Oct 03, 2022 at 11:44:58AM -0400, Waiman Long wrote:
> For blkcg_css_alloc(), the only error that will be returned is -ENOMEM.
> Simplify error handling code by returning this error directly instead
> of setting an intermediate "ret" variable.
> 
> Signed-off-by: Waiman Long <longman@redhat.com>
> Reviewed-by: Ming Lei <ming.lei@redhat.com>

Acked-by: Tejun Heo <tj@kernel.org>

Thanks.
diff mbox series

Patch

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 869af9d72bcf..946592249795 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1177,7 +1177,6 @@  static struct cgroup_subsys_state *
 blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
 {
 	struct blkcg *blkcg;
-	struct cgroup_subsys_state *ret;
 	int i;
 
 	mutex_lock(&blkcg_pol_mutex);
@@ -1186,10 +1185,8 @@  blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
 		blkcg = &blkcg_root;
 	} else {
 		blkcg = kzalloc(sizeof(*blkcg), GFP_KERNEL);
-		if (!blkcg) {
-			ret = ERR_PTR(-ENOMEM);
+		if (!blkcg)
 			goto unlock;
-		}
 	}
 
 	for (i = 0; i < BLKCG_MAX_POLS ; i++) {
@@ -1206,10 +1203,9 @@  blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
 			continue;
 
 		cpd = pol->cpd_alloc_fn(GFP_KERNEL);
-		if (!cpd) {
-			ret = ERR_PTR(-ENOMEM);
+		if (!cpd)
 			goto free_pd_blkcg;
-		}
+
 		blkcg->cpd[i] = cpd;
 		cpd->blkcg = blkcg;
 		cpd->plid = i;
@@ -1238,7 +1234,7 @@  blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
 		kfree(blkcg);
 unlock:
 	mutex_unlock(&blkcg_pol_mutex);
-	return ret;
+	return ERR_PTR(-ENOMEM);
 }
 
 static int blkcg_css_online(struct cgroup_subsys_state *css)