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regmap: prevent division by zero in rbtree_show

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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
This commit is contained in:
Stephen Warren 2012-04-04 15:48:33 -06:00 committed by Mark Brown
parent e466de0519
commit c04c1b9ee8
1 changed files with 7 additions and 1 deletions
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8
drivers/base/regmap/regcache-rbtree.c
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@ -138,6 +138,7 @@ static int rbtree_show(struct seq_file *s, void *ignored)
unsigned int base, top; unsigned int base, top;
int nodes = 0; int nodes = 0;
int registers = 0; int registers = 0;
int average;
mutex_lock(&map->lock); mutex_lock(&map->lock);
@ -152,8 +153,13 @@ static int rbtree_show(struct seq_file *s, void *ignored)
registers += top - base + 1; registers += top - base + 1;
} }
if (nodes)
average = registers / nodes;
else
average = 0;
seq_printf(s, "%d nodes, %d registers, average %d registers\n", seq_printf(s, "%d nodes, %d registers, average %d registers\n",
nodes, registers, registers / nodes); nodes, registers, average);
mutex_unlock(&map->lock); mutex_unlock(&map->lock);