sh: clkfwk: Safer resume from hibernation.

This patch fixes a possible problem in the resume from
hibenration. It temporaneally saves the clk->rate on the
stack to avoid any possible change during the clk->set_parent(..)
call.

Signed-off-by: Francesco Virlinzi <francesco.virlinzi@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/arch/sh/kernel/cpu/clock.c b/arch/sh/kernel/cpu/clock.c
index 3209a8740fa4..1dc896483b59 100644
--- a/arch/sh/kernel/cpu/clock.c
+++ b/arch/sh/kernel/cpu/clock.c
@@ -372,12 +372,14 @@ static int clks_sysdev_suspend(struct sys_device *dev, pm_message_t state)
                 if (prev_state.event == PM_EVENT_FREEZE) {
                         list_for_each_entry(clkp, &clock_list, node)
                                 if (likely(clkp->ops)) {
+                                        unsigned long rate = clkp->rate;
+
                                         if (likely(clkp->ops->set_parent))
                                                 clkp->ops->set_parent(clkp,
                                                         clkp->parent);
                                         if (likely(clkp->ops->set_rate))
                                                 clkp->ops->set_rate(clkp,
-                                                        clkp->rate, NO_CHANGE);
+                                                        rate, NO_CHANGE);
                                         else if (likely(clkp->ops->recalc))
                                                 clkp->ops->recalc(clkp);
                                         }