blob: 29348b8ab4777bcce87eb0cc92441f260902272e [file] [log] [blame]
From d1da3bdbd8ffdf42806301f11bdc1b330a2585ff Mon Sep 17 00:00:00 2001
From: Stephen Boyd <sboyd@kernel.org>
Date: Wed, 5 Feb 2020 15:27:59 -0800
Subject: [PATCH] clk: Don't cache errors from clk_ops::get_phase()
commit f21cf9c77ee82ef8adfeb2143adfacf21ec1d5cc upstream.
We don't check for errors from clk_ops::get_phase() before storing away
the result into the clk_core::phase member. This can lead to some fairly
confusing debugfs information if these ops do return an error. Let's
skip the store when this op fails to fix this. While we're here, move
the locking outside of clk_core_get_phase() to simplify callers from
the debugfs side.
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lkml.kernel.org/r/20200205232802.29184-2-sboyd@kernel.org
Acked-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 0ae52b9309e8..04181de06ac6 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2631,12 +2631,14 @@ static int clk_core_get_phase(struct clk_core *core)
{
int ret;
- clk_prepare_lock();
+ lockdep_assert_held(&prepare_lock);
+ if (!core->ops->get_phase)
+ return 0;
+
/* Always try to update cached phase if possible */
- if (core->ops->get_phase)
- core->phase = core->ops->get_phase(core->hw);
- ret = core->phase;
- clk_prepare_unlock();
+ ret = core->ops->get_phase(core->hw);
+ if (ret >= 0)
+ core->phase = ret;
return ret;
}
@@ -2650,10 +2652,16 @@ static int clk_core_get_phase(struct clk_core *core)
*/
int clk_get_phase(struct clk *clk)
{
+ int ret;
+
if (!clk)
return 0;
- return clk_core_get_phase(clk->core);
+ clk_prepare_lock();
+ ret = clk_core_get_phase(clk->core);
+ clk_prepare_unlock();
+
+ return ret;
}
EXPORT_SYMBOL_GPL(clk_get_phase);
@@ -2873,16 +2881,24 @@ static struct hlist_head *orphan_list[] = {
static void clk_summary_show_one(struct seq_file *s, struct clk_core *c,
int level)
{
+ int phase;
+
if (!c)
return;
- seq_printf(s, "%*s%-*s %7d %8d %8d %11lu %10lu %5d %6d\n",
+ seq_printf(s, "%*s%-*s %7d %8d %8d %11lu %10lu ",
level * 3 + 1, "",
30 - level * 3, c->name,
c->enable_count, c->prepare_count, c->protect_count,
- clk_core_get_rate(c), clk_core_get_accuracy(c),
- clk_core_get_phase(c),
- clk_core_get_scaled_duty_cycle(c, 100000));
+ clk_core_get_rate(c), clk_core_get_accuracy(c));
+
+ phase = clk_core_get_phase(c);
+ if (phase >= 0)
+ seq_printf(s, "%5d", phase);
+ else
+ seq_puts(s, "-----");
+
+ seq_printf(s, " %6d\n", clk_core_get_scaled_duty_cycle(c, 100000));
}
static void clk_summary_show_subtree(struct seq_file *s, struct clk_core *c,
@@ -2922,6 +2938,7 @@ DEFINE_SHOW_ATTRIBUTE(clk_summary);
static void clk_dump_one(struct seq_file *s, struct clk_core *c, int level)
{
+ int phase;
if (!c)
return;
@@ -2932,7 +2949,9 @@ static void clk_dump_one(struct seq_file *s, struct clk_core *c, int level)
seq_printf(s, "\"protect_count\": %d,", c->protect_count);
seq_printf(s, "\"rate\": %lu,", clk_core_get_rate(c));
seq_printf(s, "\"accuracy\": %lu,", clk_core_get_accuracy(c));
- seq_printf(s, "\"phase\": %d,", clk_core_get_phase(c));
+ phase = clk_core_get_phase(c);
+ if (phase >= 0)
+ seq_printf(s, "\"phase\": %d,", phase);
seq_printf(s, "\"duty_cycle\": %u",
clk_core_get_scaled_duty_cycle(c, 100000));
}
@@ -3331,14 +3350,11 @@ static int __clk_core_init(struct clk_core *core)
core->accuracy = 0;
/*
- * Set clk's phase.
+ * Set clk's phase by clk_core_get_phase() caching the phase.
* Since a phase is by definition relative to its parent, just
* query the current clock phase, or just assume it's in phase.
*/
- if (core->ops->get_phase)
- core->phase = core->ops->get_phase(core->hw);
- else
- core->phase = 0;
+ clk_core_get_phase(core);
/*
* Set clk's duty cycle.
--
2.7.4