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

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Date:   Thu, 26 Dec 2019 14:13:54 -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] 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 drop a big WARN_ON 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>
---

I suspect that this may start warning for other users. Let's see
and revert in case it doesn't work.

 drivers/clk/clk.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 772258de2d1f..6a9a66dfdeaa 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3427,13 +3427,13 @@ static int __clk_core_init(struct clk_core *core)
 		unsigned long flags;
 
 		ret = clk_core_prepare(core);
-		if (ret)
+		if (WARN_ON(ret))
 			goto out;
 
 		flags = clk_enable_lock();
 		ret = clk_core_enable(core);
 		clk_enable_unlock(flags);
-		if (ret) {
+		if (WARN_ON(ret)) {
 			clk_core_unprepare(core);
 			goto out;
 		}

base-commit: 12ead77432f2ce32dea797742316d15c5800cb32
-- 
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