[PATCH v12 09/10] clk: Take the prepare lock when updating the per-user constraints

From: Tomeu Vizoso
Date: Mon Sep 22 2014 - 10:17:06 EST


Signed-off-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
---
drivers/clk/clk.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 17b6ba1..5d23ff3 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1734,15 +1734,25 @@ EXPORT_SYMBOL_GPL(clk_set_rate);
int clk_set_floor_rate(struct clk *clk_user, unsigned long rate)
{
struct clk_core *clk = clk_to_clk_core(clk_user);
+ int ret;
+
+ clk_prepare_lock();

clk_user->floor_constraint = rate;
- return clk_provider_set_rate(clk, clk_provider_get_rate(clk));
+ ret = clk_provider_set_rate(clk, clk_provider_get_rate(clk));
+
+ clk_prepare_unlock();
+
+ return ret;
}
EXPORT_SYMBOL_GPL(clk_set_floor_rate);

int clk_set_ceiling_rate(struct clk *clk_user, unsigned long rate)
{
struct clk_core *clk = clk_to_clk_core(clk_user);
+ int ret;
+
+ clk_prepare_lock();

WARN(rate > 0 && rate < clk_user->floor_constraint,
"clk %s dev %s con %s: new ceiling %lu lower than existing floor %lu\n",
@@ -1750,7 +1760,11 @@ int clk_set_ceiling_rate(struct clk *clk_user, unsigned long rate)
clk_user->floor_constraint);

clk_user->ceiling_constraint = rate;
- return clk_provider_set_rate(clk, clk_provider_get_rate(clk));
+ ret = clk_provider_set_rate(clk, clk_provider_get_rate(clk));
+
+ clk_prepare_unlock();
+
+ return ret;
}
EXPORT_SYMBOL_GPL(clk_set_ceiling_rate);

--
1.9.3

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