regmap: prevent division by zero in rbtree_show

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@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@vger.kernel.org

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c
index 5157fa04c2f0..ea76a90630bf 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;
 
         mutex_lock(&map->lock);
 
@@ -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);
 
         mutex_unlock(&map->lock);