This is a note to let you know that I've just added the patch titled
regmap: prevent division by zero in rbtree_show
to the 3.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
regmap-prevent-division-by-zero-in-rbtree_show.patch
and it can be found in the queue-3.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From c04c1b9ee8f30c7a3a25e20e406247003f634ebe Mon Sep 17 00:00:00 2001
From: Stephen Warren <[email protected]>
Date: Wed, 4 Apr 2012 15:48:33 -0600
Subject: regmap: prevent division by zero in rbtree_show
From: Stephen Warren <[email protected]>
commit c04c1b9ee8f30c7a3a25e20e406247003f634ebe upstream.
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 <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/base/regmap/regcache-rbtree.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- 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 *
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 *
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);
Patches currently in stable-queue which might be from [email protected] are
queue-3.3/regmap-prevent-division-by-zero-in-rbtree_show.patch
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