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| author | Anton Vorontsov <anton.vorontsov@linaro.org> | 2012-07-09 17:10:39 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-07-17 09:50:53 -0700 |
| commit | b2ad368bebc0f772613668e893fa176396e9094c (patch) | |
| tree | f2c14b8eea287afdab9eb5eba59792e1048b212a /kernel/trace | |
| parent | c1743cbc8d20d208bb1d2b10598204f2d89b144c (diff) | |
| download | linux-b2ad368bebc0f772613668e893fa176396e9094c.tar.gz linux-b2ad368bebc0f772613668e893fa176396e9094c.tar.bz2 linux-b2ad368bebc0f772613668e893fa176396e9094c.zip | |
tracing: Fix initialization failure path in tracing_set_tracer()
If tracer->init() fails, current code will leave current_tracer pointing
to an unusable tracer, which at best makes 'current_tracer' report
inaccurate value.
Fix the issue by pointing current_tracer to nop tracer, and only update
current_tracer with the new one after all the initialization succeeds.
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/trace.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 49249c28690d..44ee11e31b82 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -3172,10 +3172,10 @@ static int tracing_set_tracer(const char *buf) } destroy_trace_option_files(topts); - current_trace = t; + current_trace = &nop_trace; - topts = create_trace_option_files(current_trace); - if (current_trace->use_max_tr) { + topts = create_trace_option_files(t); + if (t->use_max_tr) { int cpu; /* we need to make per cpu buffer sizes equivalent */ for_each_tracing_cpu(cpu) { @@ -3195,6 +3195,7 @@ static int tracing_set_tracer(const char *buf) goto out; } + current_trace = t; trace_branch_enable(tr); out: mutex_unlock(&trace_types_lock); |