linux-kernel - [PATCH 3/4] clk: renesas: cpg-mssr: Check return value of pm_genpd

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Date:   Wed, 17 Nov 2021 11:51:00 +0000
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Jiri Kosina <trivial@...nel.org>,
        linux-renesas-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: [PATCH 3/4] clk: renesas: cpg-mssr: Check return value of pm_genpd_init()

Make sure we check the return value of pm_genpd_init() which might fail.
Also add a devres action to remove the power-domain in-case the probe
callback fails further down in the code flow.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
 drivers/clk/renesas/renesas-cpg-mssr.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/renesas/renesas-cpg-mssr.c b/drivers/clk/renesas/renesas-cpg-mssr.c
index 21f762aa2131..f596a6438ac4 100644
--- a/drivers/clk/renesas/renesas-cpg-mssr.c
+++ b/drivers/clk/renesas/renesas-cpg-mssr.c
@@ -552,6 +552,11 @@ void cpg_mssr_detach_dev(struct generic_pm_domain *unused, struct device *dev)
 		pm_clk_destroy(dev);
 }
 
+static void cpg_mssr_genpd_remove(void *data)
+{
+	pm_genpd_remove(data);
+}
+
 static int __init cpg_mssr_add_clk_domain(struct device *dev,
 					  const unsigned int *core_pm_clks,
 					  unsigned int num_core_pm_clks)
@@ -560,6 +565,7 @@ static int __init cpg_mssr_add_clk_domain(struct device *dev,
 	struct generic_pm_domain *genpd;
 	struct cpg_mssr_clk_domain *pd;
 	size_t pm_size = num_core_pm_clks * sizeof(core_pm_clks[0]);
+	int ret;
 
 	pd = devm_kzalloc(dev, sizeof(*pd) + pm_size, GFP_KERNEL);
 	if (!pd)
@@ -574,7 +580,13 @@ static int __init cpg_mssr_add_clk_domain(struct device *dev,
 		       GENPD_FLAG_ACTIVE_WAKEUP;
 	genpd->attach_dev = cpg_mssr_attach_dev;
 	genpd->detach_dev = cpg_mssr_detach_dev;
-	pm_genpd_init(genpd, &pm_domain_always_on_gov, false);
+	ret = pm_genpd_init(genpd, &pm_domain_always_on_gov, false);
+	if (ret)
+		return ret;
+	ret = devm_add_action_or_reset(dev, cpg_mssr_genpd_remove, genpd);
+	if (ret)
+		return ret;
+
 	cpg_mssr_clk_domain = pd;
 
 	of_genpd_add_provider_simple(np, genpd);
-- 
2.17.1