[PATCH v9 1/3] blk-cgroup: Return -ENOMEM directly in blkcg_css_alloc() error path

Waiman Long
2022-11-04T18:20:48Z

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>
---
block/blk-cgroup.c | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 6a5c849ee061..af8a4d2d1fd1 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1139,7 +1139,6 @@ 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);
@@ -1148,10 +1147,8 @@ 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++) {
@@ -1168,10 +1165,9 @@ 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;
@@ -1200,7 +1196,7 @@ 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)
--
2.31.1