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Message-Id: <20190914210300.15836-4-tony@atomide.com>
Date: Sat, 14 Sep 2019 14:02:56 -0700
From: Tony Lindgren <tony@...mide.com>
To: Matt Mackall <mpm@...enic.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Cc: linux-crypto@...r.kernel.org, Aaro Koskinen <aaro.koskinen@....fi>,
Adam Ford <aford173@...il.com>,
Pali Rohár <pali.rohar@...il.com>,
Sebastian Reichel <sre@...nel.org>,
Tero Kristo <t-kristo@...com>,
Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Subject: [PATCH 3/7] hwrng: omap3-rom - Call clk_disable_unprepare() on exit only if not idled
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>
---
drivers/char/hw_random/omap3-rom-rng.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/char/hw_random/omap3-rom-rng.c b/drivers/char/hw_random/omap3-rom-rng.c
--- a/drivers/char/hw_random/omap3-rom-rng.c
+++ b/drivers/char/hw_random/omap3-rom-rng.c
@@ -127,7 +127,8 @@ static int omap3_rom_rng_remove(struct platform_device *pdev)
{
cancel_delayed_work_sync(&idle_work);
hwrng_unregister(&omap3_rom_rng_ops);
- clk_disable_unprepare(rng_clk);
+ if (!rng_idle)
+ clk_disable_unprepare(rng_clk);
return 0;
}
--
2.23.0
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