diff options
| author | Mark Brown <broonie@kernel.org> | 2020-03-11 18:45:26 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-03-11 18:45:26 +0000 |
| commit | 4d90a4e677c5c45c787a774c84442e75c7ddd5be (patch) | |
| tree | 50312d13362dd49615148661ae7e6d91ac349719 /include/linux/blktrace_api.h | |
| parent | 9032cdd96a2d4b0ef2f43499328f8a68050be2ec (diff) | |
| parent | 2c523b344dfa65a3738e7039832044aa133c75fb (diff) | |
Merge tag 'v5.6-rc5' into asoc-5.7
Linux 5.6-rc5
Diffstat (limited to 'include/linux/blktrace_api.h')
| -rw-r--r-- | include/linux/blktrace_api.h | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h index 7bb2d8de9f30..3b6ff5902edc 100644 --- a/include/linux/blktrace_api.h +++ b/include/linux/blktrace_api.h @@ -51,9 +51,13 @@ void __trace_note_message(struct blk_trace *, struct blkcg *blkcg, const char *f **/ #define blk_add_cgroup_trace_msg(q, cg, fmt, ...) \ do { \ - struct blk_trace *bt = (q)->blk_trace; \ + struct blk_trace *bt; \ + \ + rcu_read_lock(); \ + bt = rcu_dereference((q)->blk_trace); \ if (unlikely(bt)) \ __trace_note_message(bt, cg, fmt, ##__VA_ARGS__);\ + rcu_read_unlock(); \ } while (0) #define blk_add_trace_msg(q, fmt, ...) \ blk_add_cgroup_trace_msg(q, NULL, fmt, ##__VA_ARGS__) @@ -61,10 +65,14 @@ void __trace_note_message(struct blk_trace *, struct blkcg *blkcg, const char *f static inline bool blk_trace_note_message_enabled(struct request_queue *q) { - struct blk_trace *bt = q->blk_trace; - if (likely(!bt)) - return false; - return bt->act_mask & BLK_TC_NOTIFY; + struct blk_trace *bt; + bool ret; + + rcu_read_lock(); + bt = rcu_dereference(q->blk_trace); + ret = bt && (bt->act_mask & BLK_TC_NOTIFY); + rcu_read_unlock(); + return ret; } extern void blk_add_driver_data(struct request_queue *q, struct request *rq, |