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
diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c
index 5157fa0..ea76a90 100644
--- a/drivers/base/regmap/regcache-rbtree.c
+++ b/drivers/base/regmap/regcache-rbtree.c
@@ -138,6 +138,7 @@
unsigned int base, top;
int nodes = 0;
int registers = 0;
+ int average;
mutex_lock(&map->lock);
@@ -152,8 +153,13 @@
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);
