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| author |   Stephen Warren <swarren@nvidia.com> | 2012-04-04 15:48:33 -0600 |
|---|---|---|
| committer |   Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-04-04 23:22:15 +0100 |
| commit | c04c1b9ee8f30c7a3a25e20e406247003f634ebe (patch) | |
| tree | c8f1de34051bce402ee5be5d6dfadc4bc7e47ae1 | |
| parent | regmap: Export regcache_sync_region() (diff) | |
| download | linux-dev-c04c1b9ee8f30c7a3a25e20e406247003f634ebe.tar.xz linux-dev-c04c1b9ee8f30c7a3a25e20e406247003f634ebe.zip | |
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
| -rw-r--r-- | drivers/base/regmap/regcache-rbtree.c | 8 |
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); |