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
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@ -138,6 +138,7 @@ static int rbtree_show(struct seq_file *s, void *ignored)
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unsigned int base, top;
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int nodes = 0;
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int registers = 0;
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int average;
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mutex_lock(&map->lock);
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@ -152,8 +153,13 @@ static int rbtree_show(struct seq_file *s, void *ignored)
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registers += top - base + 1;
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}
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if (nodes)
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average = registers / nodes;
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else
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average = 0;
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seq_printf(s, "%d nodes, %d registers, average %d registers\n",
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nodes, registers, registers / nodes);
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nodes, registers, average);
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mutex_unlock(&map->lock);
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