[PATCH 6/6] regmap: prevent division by zero in rbtree_show

[Stephen Warren]

From: Stephen Warren <swarren@xxxxxxxxxx>

If there are no nodes in the cache, nodes will be 0, so calculating
"registers / nodes" will cause division by zero.

Signed-off-by: Stephen Warren <swarren@xxxxxxxxxx>
---
 drivers/base/regmap/regcache-rbtree.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c
index 9eea758..e49e71f 100644
--- a/drivers/base/regmap/regcache-rbtree.c
+++ b/drivers/base/regmap/regcache-rbtree.c
@@ -138,6 +138,7 @@ static int rbtree_show(struct seq_file *s, void *ignored)
 	unsigned int base, top;
 	int nodes = 0;
 	int registers = 0;
+	int average;
 
 	map->lock(map);
 
@@ -152,8 +153,13 @@ static int rbtree_show(struct seq_file *s, void *ignored)
 		registers += top - base + 1;
 	}
 
+	if (nodes)
+		average = registers / nodes;
+	else
+		average = 0;
+
 	seq_printf(s, "%d nodes, %d registers, average %d registers\n",
-		   nodes, registers, registers / nodes);
+		   nodes, registers, average);
 
 	map->unlock(map);
 
-- 
1.7.0.4

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