linux-kernel - [PATCH 1/3] perf/core: check return value of perf_event

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Date:	Mon,  1 Aug 2016 19:44:53 -0700
From:	David Carrillo-Cisneros <davidcc@...gle.com>
To:	linux-kernel@...r.kernel.org
Cc:	"x86@...nel.org" <x86@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <ak@...ux.intel.com>,
	Kan Liang <kan.liang@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Paul Turner <pjt@...gle.com>,
	Stephane Eranian <eranian@...gle.com>,
	David Carrillo-Cisneros <davidcc@...gle.com>
Subject: [PATCH 1/3] perf/core: check return value of perf_event_read IPI

The call to smp_call_function_single in perf_event_read() may fail and,
when it does, its error value is the one to return.

Signed-off-by: David Carrillo-Cisneros <davidcc@...gle.com>
Reviewed-by: Stephane Eranian <eranian@...gle.com>
---
 kernel/events/core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 9345028..ebc187f 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3469,9 +3469,9 @@ static int perf_event_read(struct perf_event *event, bool group)
 			.group = group,
 			.ret = 0,
 		};
-		smp_call_function_single(event->oncpu,
-					 __perf_event_read, &data, 1);
+		ret = smp_call_function_single(event->oncpu,
+					       __perf_event_read, &data, 1);
-		ret = data.ret;
+		ret = ret ? : data.ret;
 	} else if (event->state == PERF_EVENT_STATE_INACTIVE) {
 		struct perf_event_context *ctx = event->ctx;
 		unsigned long flags;
-- 
2.8.0.rc3.226.g39d4020