linux-kernel - [PATCH 1/2] phy: qcom-qmp-combo: fix init-count imbalance

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Date:   Tue,  2 May 2023 12:38:09 +0200
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>, stable@...r.kernel.org
Subject: [PATCH 1/2] phy: qcom-qmp-combo: fix init-count imbalance

The init counter is not decremented on initialisation errors, which
prevents retrying initialisation and can lead to the runtime suspend
callback attempting to disable resources that have never been enabled.

Add the missing decrement on initialisation errors so that the counter
reflects the state of the device.

Fixes: e78f3d15e115 ("phy: qcom-qmp: new qmp phy driver for qcom-chipsets")
Cc: stable@...r.kernel.org	# 4.12
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
index c1483e157af4..ae412d64b426 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
@@ -2487,7 +2487,7 @@ static int qmp_combo_com_init(struct qmp_combo *qmp)
 	ret = regulator_bulk_enable(cfg->num_vregs, qmp->vregs);
 	if (ret) {
 		dev_err(qmp->dev, "failed to enable regulators, err=%d\n", ret);
-		goto err_unlock;
+		goto err_decrement_count;
 	}
 
 	ret = reset_control_bulk_assert(cfg->num_resets, qmp->resets);
@@ -2537,7 +2537,8 @@ static int qmp_combo_com_init(struct qmp_combo *qmp)
 	reset_control_bulk_assert(cfg->num_resets, qmp->resets);
 err_disable_regulators:
 	regulator_bulk_disable(cfg->num_vregs, qmp->vregs);
-err_unlock:
+err_decrement_count:
+	qmp->init_count--;
 	mutex_unlock(&qmp->phy_mutex);
 
 	return ret;
-- 
2.39.2