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authorIngo Molnar <mingo@kernel.org>2015-04-16 12:38:30 +0200
committerIngo Molnar <mingo@kernel.org>2015-04-18 13:31:26 +0200
commit0c99241c93b8060441f3c8434848e54b5338f922 (patch)
tree8e1182be161578cf64af32a3a8e91b2b1d17c4aa /arch
parent78d504bcd769cc496f63b626f507039eab2316b7 (diff)
perf/x86/intel/pt: Fix and clean up error handling in pt_event_add()
Dan Carpenter reported that pt_event_add() has buggy error handling logic: it returns 0 instead of -EBUSY when it fails to start a newly added event. Furthermore, the control flow in this function is messy, with cleanup labels mixed with direct returns. Fix the bug and clean up the code by converting it to a straight fast path for the regular non-failing case, plus a clear sequence of cascading goto labels to do all cleanup. NOTE: I materially changed the existing clean up logic in the pt_event_start() failure case to use the direct perf_aux_output_end() path, not pt_event_del(), because perf_aux_output_end() is enough here. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Julia Lawall <julia.lawall@lip6.fr> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20150416103830.GB7847@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/cpu/perf_event_intel_pt.c33
1 files changed, 15 insertions, 18 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_intel_pt.c b/arch/x86/kernel/cpu/perf_event_intel_pt.c
index f2770641c0fd..ffe666c2c6b5 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_pt.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_pt.c
@@ -988,39 +988,36 @@ static int pt_event_add(struct perf_event *event, int mode)
int ret = -EBUSY;
if (pt->handle.event)
- goto out;
+ goto fail;
buf = perf_aux_output_begin(&pt->handle, event);
- if (!buf) {
- ret = -EINVAL;
- goto out;
- }
+ ret = -EINVAL;
+ if (!buf)
+ goto fail_stop;
pt_buffer_reset_offsets(buf, pt->handle.head);
if (!buf->snapshot) {
ret = pt_buffer_reset_markers(buf, &pt->handle);
- if (ret) {
- perf_aux_output_end(&pt->handle, 0, true);
- goto out;
- }
+ if (ret)
+ goto fail_end_stop;
}
if (mode & PERF_EF_START) {
pt_event_start(event, 0);
- if (hwc->state == PERF_HES_STOPPED) {
- pt_event_del(event, 0);
- ret = -EBUSY;
- }
+ ret = -EBUSY;
+ if (hwc->state == PERF_HES_STOPPED)
+ goto fail_end_stop;
} else {
hwc->state = PERF_HES_STOPPED;
}
- ret = 0;
-out:
-
- if (ret)
- hwc->state = PERF_HES_STOPPED;
+ return 0;
+fail_end_stop:
+ perf_aux_output_end(&pt->handle, 0, true);
+fail_stop:
+ hwc->state = PERF_HES_STOPPED;
+fail:
return ret;
}