diff options
| author | Stephen Warren <swarren@nvidia.com> | 2012-04-04 15:48:33 -0600 |
|---|---|---|
| committer | Simone Willett <swillett@nvidia.com> | 2012-04-15 14:12:08 -0700 |
| commit | 88deb440c6cea0709f3118d9727d925b632612a3 (patch) | |
| tree | c49139933b68d8a438ba3641ca0d036aca14c01e /drivers/base | |
| parent | e42eab476ec6a043814608b1375c1632c86fba74 (diff) | |
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
(cherry picked from commit c04c1b9ee8f30c7a3a25e20e406247003f634ebe)
Change-Id: I30047f1e0bd08417794c3d19e2fe1d480a74e083
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: http://git-master/r/96501
Reviewed-by: Simone Willett <swillett@nvidia.com>
Tested-by: Simone Willett <swillett@nvidia.com>
Diffstat (limited to 'drivers/base')
| -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 de7241c29a71..acdc1d443b2e 100644 --- a/drivers/base/regmap/regcache-rbtree.c +++ b/drivers/base/regmap/regcache-rbtree.c @@ -137,6 +137,7 @@ 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); @@ -151,8 +152,13 @@ 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); |