linux-kernel - [PATCH] clk: qcom: gdsc: add missing error handling

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Message-Id: <20220929155816.17425-1-johan+linaro@kernel.org>
Date:   Thu, 29 Sep 2022 17:58:16 +0200
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Bjorn Andersson <andersson@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>
Subject: [PATCH] clk: qcom: gdsc: add missing error handling

Since commit 7eb231c337e0 ("PM / Domains: Convert pm_genpd_init() to
return an error code") pm_genpd_init() can return an error which the
caller must handle.

The current error handling was also incomplete as the runtime PM and
regulator use counts were not balanced in all error paths.

Add the missing error handling to the GDSC initialisation to avoid
continuing as if nothing happened on errors.

Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/clk/qcom/gdsc.c | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c
index e1d6574d2797..0b67bd72e217 100644
--- a/drivers/clk/qcom/gdsc.c
+++ b/drivers/clk/qcom/gdsc.c
@@ -451,11 +451,8 @@ static int gdsc_init(struct gdsc *sc)
 
 		/* ...and the power-domain */
 		ret = gdsc_pm_runtime_get(sc);
-		if (ret) {
-			if (sc->rsupply)
-				regulator_disable(sc->rsupply);
-			return ret;
-		}
+		if (ret)
+			goto err_disable_supply;
 
 		/*
 		 * Votable GDSCs can be ON due to Vote from other masters.
@@ -464,14 +461,14 @@ static int gdsc_init(struct gdsc *sc)
 		if (sc->flags & VOTABLE) {
 			ret = gdsc_update_collapse_bit(sc, false);
 			if (ret)
-				return ret;
+				goto err_put_rpm;
 		}
 
 		/* Turn on HW trigger mode if supported */
 		if (sc->flags & HW_CTRL) {
 			ret = gdsc_hwctrl(sc, true);
 			if (ret < 0)
-				return ret;
+				goto err_put_rpm;
 		}
 
 		/*
@@ -498,9 +495,21 @@ static int gdsc_init(struct gdsc *sc)
 		sc->pd.power_off = gdsc_disable;
 	if (!sc->pd.power_on)
 		sc->pd.power_on = gdsc_enable;
-	pm_genpd_init(&sc->pd, NULL, !on);
+
+	ret = pm_genpd_init(&sc->pd, NULL, !on);
+	if (ret)
+		goto err_put_rpm;
 
 	return 0;
+
+err_put_rpm:
+	if (on)
+		gdsc_pm_runtime_put(sc);
+err_disable_supply:
+	if (on && sc->rsupply)
+		regulator_disable(sc->rsupply);
+
+	return ret;
 }
 
 int gdsc_register(struct gdsc_desc *desc,
-- 
2.35.1