[PATCH] tracing: add checks for printing graph irq

[Wenji Huang]

Check return value of trace_seq_printf.

Signed-off-by: Wenji Huang <wenji.huang@xxxxxxxxxx>
---
 kernel/trace/trace_functions_graph.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 45e6c01..3fa4055 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -555,8 +555,11 @@ print_graph_irq(struct trace_iterator *iter, unsigned long addr,
 		return TRACE_TYPE_PARTIAL_LINE;
 
 	/* Don't close the duration column if haven't one */
-	if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION)
-		trace_seq_printf(s, " |");
+	if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
+		ret = trace_seq_printf(s, " |");
+		if (!ret)
+			return TRACE_TYPE_PARTIAL_LINE;
+	}
 	ret = trace_seq_printf(s, "\n");
 
 	if (!ret)
-- 
1.5.6

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