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authorAlex Elder <alex.elder@linaro.org>2013-09-05 08:33:24 -0500
committerMike Turquette <mturquette@linaro.org>2013-09-09 14:10:10 -0700
commit12d298865ec5d0f14dd570c3506c270880769ed7 (patch)
tree2bd42e97f917dc9f9122e6f672d26edce472d022
parent22e9e7589e7bc6006af983f73e4a4057dbd9da66 (diff)
downloadlinux-12d298865ec5d0f14dd570c3506c270880769ed7.tar.bz2
clk: only call get_parent if there is one
In __clk_init(), after a clock is mostly initialized, a scan is done of the orphan clocks to see if the clock being registered is the parent of any of them. This code assumes that any clock that provides a get_parent method actually has at least one parent, and that's not a valid assumption. As a result, an orphan clock with no parent can return *something* as the parent index, and that value is blindly used to dereference the orphan's parent_names[] array (which will be ZERO_SIZE_PTR or NULL). Fix this by ensuring get_parent is only called for orphans with at least one parent. Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: Mike Turquette <mturquette@linaro.org>
-rw-r--r--drivers/clk/clk.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index cc4cb6fd7d83..a004769528e6 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1742,7 +1742,7 @@ int __clk_init(struct device *dev, struct clk *clk)
* this clock
*/
hlist_for_each_entry_safe(orphan, tmp2, &clk_orphan_list, child_node) {
- if (orphan->ops->get_parent) {
+ if (orphan->num_parents && orphan->ops->get_parent) {
i = orphan->ops->get_parent(orphan->hw);
if (!strcmp(clk->name, orphan->parent_names[i]))
__clk_reparent(orphan, clk);