[added,to,the,3.12,stable,tree] clk: prevent erronous parsing of children during rate change

Message ID 1413208209-15396-53-git-send-email-jslaby@suse.cz
State New
Headers show

Commit Message

Jiri Slaby Oct. 13, 2014, 1:50 p.m.
From: Tero Kristo <t-kristo@ti.com>

This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.

Patch

===============

commit 067bb1741c27c8d3b74ac98c0b8fc12b31e67005 upstream.

In some cases, clocks can switch their parent with clk_set_rate, for
example clk_mux can do this in some cases. Current implementation of
clk_change_rate uses un-safe list iteration on the clock children, which
will cause wrong clocks to be parsed in case any of the clock children
change their parents during the change rate operation. Fixed by using
the safe list iterator instead.

The problem was detected due to some divide by zero errors generated
by clock init on dra7-evm board, see discussion under
http://article.gmane.org/gmane.linux.ports.arm.kernel/349180 for details.

Fixes: 71472c0c06cf ("clk: add support for clock reparent on set_rate")
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Reported-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/clk/clk.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index a004769528e6..f5966413fbb2 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1368,6 +1368,7 @@  static struct clk *clk_propagate_rate_change(struct clk *clk, unsigned long even
 static void clk_change_rate(struct clk *clk)
 {
 	struct clk *child;
+	struct hlist_node *tmp;
 	unsigned long old_rate;
 	unsigned long best_parent_rate = 0;
 
@@ -1391,7 +1392,11 @@  static void clk_change_rate(struct clk *clk)
 	if (clk->notifier_count && old_rate != clk->rate)
 		__clk_notify(clk, POST_RATE_CHANGE, old_rate, clk->rate);
 
-	hlist_for_each_entry(child, &clk->children, child_node) {
+	/*
+	 * Use safe iteration, as change_rate can actually swap parents
+	 * for certain clock types.
+	 */
+	hlist_for_each_entry_safe(child, tmp, &clk->children, child_node) {
 		/* Skip children who will be reparented to another clock */
 		if (child->new_parent && child->new_parent != clk)
 			continue;