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Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/blktrace.c15
1 files changed, 7 insertions, 8 deletions
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 5b28f0f119c..8d6bd12aab1 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -478,7 +478,7 @@ int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
goto err;
}
- if (atomic_add_return(1, &blk_probes_ref) == 1)
+ if (atomic_inc_return(&blk_probes_ref) == 1)
blk_register_tracepoints();
return 0;
@@ -1091,8 +1091,6 @@ static void blk_tracer_print_header(struct seq_file *m)
static void blk_tracer_start(struct trace_array *tr)
{
- if (atomic_add_return(1, &blk_probes_ref) == 1)
- blk_register_tracepoints();
trace_flags &= ~TRACE_ITER_CONTEXT_INFO;
}
@@ -1107,15 +1105,10 @@ static int blk_tracer_init(struct trace_array *tr)
static void blk_tracer_stop(struct trace_array *tr)
{
trace_flags |= TRACE_ITER_CONTEXT_INFO;
- if (atomic_dec_and_test(&blk_probes_ref))
- blk_unregister_tracepoints();
}
static void blk_tracer_reset(struct trace_array *tr)
{
- if (!atomic_read(&blk_probes_ref))
- return;
-
blk_tracer_enabled = false;
blk_tracer_stop(tr);
}
@@ -1254,6 +1247,9 @@ static int blk_trace_remove_queue(struct request_queue *q)
if (bt == NULL)
return -EINVAL;
+ if (atomic_dec_and_test(&blk_probes_ref))
+ blk_unregister_tracepoints();
+
kfree(bt);
return 0;
}
@@ -1280,6 +1276,9 @@ static int blk_trace_setup_queue(struct request_queue *q, dev_t dev)
return -EBUSY;
}
+ if (atomic_inc_return(&blk_probes_ref) == 1)
+ blk_register_tracepoints();
+
return 0;
}