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Commit c04c1b9e authored by Stephen Warren's avatar Stephen Warren Committed by Mark Brown
Browse files

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: default avatarStephen Warren <swarren@nvidia.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@vger.kernel.org
parent e466de05

drivers/base/regmap/regcache-rbtree.c

+7 −1
Original line number Diff line number Diff line
@@ -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);