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-rw-r--r--block/blk-throttle.c18
1 files changed, 12 insertions, 6 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 8b4f6b81bb72..0e17c8f92d25 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1154,21 +1154,25 @@ static ssize_t tg_set_conf(struct kernfs_open_file *of,
struct blkcg_gq *blkg;
struct cgroup_subsys_state *pos_css;
int ret;
+ u64 v;
ret = blkg_conf_prep(blkcg, &blkcg_policy_throtl, buf, &ctx);
if (ret)
return ret;
+ ret = -EINVAL;
+ if (sscanf(ctx.body, "%llu", &v) != 1)
+ goto out_finish;
+ if (!v)
+ v = -1;
+
tg = blkg_to_tg(ctx.blkg);
sq = &tg->service_queue;
- if (!ctx.v)
- ctx.v = -1;
-
if (is_u64)
- *(u64 *)((void *)tg + of_cft(of)->private) = ctx.v;
+ *(u64 *)((void *)tg + of_cft(of)->private) = v;
else
- *(unsigned int *)((void *)tg + of_cft(of)->private) = ctx.v;
+ *(unsigned int *)((void *)tg + of_cft(of)->private) = v;
throtl_log(&tg->service_queue,
"limit change rbps=%llu wbps=%llu riops=%u wiops=%u",
@@ -1201,8 +1205,10 @@ static ssize_t tg_set_conf(struct kernfs_open_file *of,
throtl_schedule_next_dispatch(sq->parent_sq, true);
}
+ ret = 0;
+out_finish:
blkg_conf_finish(&ctx);
- return nbytes;
+ return ret ?: nbytes;
}
static ssize_t tg_set_conf_u64(struct kernfs_open_file *of,