linux-kernel - [PATCH 3.16 018/148] hwrng: omap3-rom - Call clk_disable

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Date:   Sat, 08 Feb 2020 18:19:17 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Adam Ford" <aford173@...il.com>,
        "Pali Rohár" <pali.rohar@...il.com>,
        "Tero Kristo" <t-kristo@...com>,
        "Aaro Koskinen" <aaro.koskinen@....fi>,
        "Tony Lindgren" <tony@...mide.com>,
        "Herbert Xu" <herbert@...dor.apana.org.au>,
        "Sebastian Reichel" <sre@...nel.org>
Subject: [PATCH 3.16 018/148] hwrng: omap3-rom - Call clk_disable_unprepare()
 on exit only if not idled

3.16.82-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Tony Lindgren <tony@...mide.com>

commit eaecce12f5f0d2c35d278e41e1bc4522393861ab upstream.

When unloading omap3-rom-rng, we'll get the following:

WARNING: CPU: 0 PID: 100 at drivers/clk/clk.c:948 clk_core_disable

This is because the clock may be already disabled by omap3_rom_rng_idle().
Let's fix the issue by checking for rng_idle on exit.

Cc: Aaro Koskinen <aaro.koskinen@....fi>
Cc: Adam Ford <aford173@...il.com>
Cc: Pali Rohár <pali.rohar@...il.com>
Cc: Sebastian Reichel <sre@...nel.org>
Cc: Tero Kristo <t-kristo@...com>
Fixes: 1c6b7c2108bd ("hwrng: OMAP3 ROM Random Number Generator support")
Signed-off-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/char/hw_random/omap3-rom-rng.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/char/hw_random/omap3-rom-rng.c
+++ b/drivers/char/hw_random/omap3-rom-rng.c
@@ -119,7 +119,8 @@ static int omap3_rom_rng_probe(struct pl
 static int omap3_rom_rng_remove(struct platform_device *pdev)
 {
 	hwrng_unregister(&omap3_rom_rng_ops);
-	clk_disable_unprepare(rng_clk);
+	if (!rng_idle)
+		clk_disable_unprepare(rng_clk);
 	return 0;
 }