linux-kernel - [PATCH v2] clk: Warn about critical clks that fail to enable

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Message-Id: <20200102005503.71923-1-sboyd@kernel.org>
Date:   Wed,  1 Jan 2020 16:55:03 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        Jerome Brunet <jbrunet@...libre.com>,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH v2] clk: Warn about critical clks that fail to enable

If we don't warn here users of the CLK_IS_CRITICAL flag may not know
that their clk isn't actually enabled because it silently fails to
enable. Let's print a warning in that case so developers find these
problems faster.

Suggested-by: Jerome Brunet <jbrunet@...libre.com>
Cc: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
---

Changes from v1:
 * Switched to pr_warn and indicated clk name

 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 772258de2d1f..b03c2be4014b 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3427,13 +3427,18 @@ static int __clk_core_init(struct clk_core *core)
 		unsigned long flags;
 
 		ret = clk_core_prepare(core);
-		if (ret)
+		if (ret) {
+			pr_warn("%s: critical clk '%s' failed to prepare\n",
+			       __func__, core->name);
 			goto out;
+		}
 
 		flags = clk_enable_lock();
 		ret = clk_core_enable(core);
 		clk_enable_unlock(flags);
 		if (ret) {
+			pr_warn("%s: critical clk '%s' failed to enable\n",
+			       __func__, core->name);
 			clk_core_unprepare(core);
 			goto out;
 		}

base-commit: 12ead77432f2ce32dea797742316d15c5800cb32
-- 
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