usb: chipidea: ci_hdrc_imx: fix call balance of regulator routines

Upon encountering errors during the HSIC pinctrl handling section the
regulator should be disabled.

Use devm_add_action_or_reset() to let the regulator-disabling routine be
handled by device resource management stack.

Found by Linux Verification Center (linuxtesting.org).

Fixes: 4d6141288c33 ("usb: chipidea: imx: pinctrl for HSIC is optional")
Cc: stable <stable@kernel.org>
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Acked-by: Peter Chen <peter.chen@kernel.org>
Link: https://lore.kernel.org/r/20250316102658.490340-3-pchelkin@ispras.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
index 619779eef333446d196e5f3b70b976dd06e6afff..d942b3c72640eb63aa65b455bd98ed0ba7f14b05 100644 (file)
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -336,6 +336,13 @@ static int ci_hdrc_imx_notify_event(struct ci_hdrc *ci, unsigned int event)
        return ret;
 }
 
+static void ci_hdrc_imx_disable_regulator(void *arg)
+{
+       struct ci_hdrc_imx_data *data = arg;
+
+       regulator_disable(data->hsic_pad_regulator);
+}
+
 static int ci_hdrc_imx_probe(struct platform_device *pdev)
 {
        struct ci_hdrc_imx_data *data;
@@ -394,6 +401,13 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
                                        "Failed to enable HSIC pad regulator\n");
                                goto err_put;
                        }
+                       ret = devm_add_action_or_reset(dev,
+                                       ci_hdrc_imx_disable_regulator, data);
+                       if (ret) {
+                               dev_err(dev,
+                                       "Failed to add regulator devm action\n");
+                               goto err_put;
+                       }
                }
        }
 
@@ -432,11 +446,11 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
 
        ret = imx_get_clks(dev);
        if (ret)
-               goto disable_hsic_regulator;
+               goto qos_remove_request;
 
        ret = imx_prepare_enable_clks(dev);
        if (ret)
-               goto disable_hsic_regulator;
+               goto qos_remove_request;
 
        ret = clk_prepare_enable(data->clk_wakeup);
        if (ret)
@@ -526,10 +540,7 @@ err_clk:
        clk_disable_unprepare(data->clk_wakeup);
 err_wakeup_clk:
        imx_disable_unprepare_clks(dev);
-disable_hsic_regulator:
-       if (data->hsic_pad_regulator)
-               /* don't overwrite original ret (cf. EPROBE_DEFER) */
-               regulator_disable(data->hsic_pad_regulator);
+qos_remove_request:
        if (pdata.flags & CI_HDRC_PMQOS)
                cpu_latency_qos_remove_request(&data->pm_qos_req);
        data->ci_pdev = NULL;
@@ -557,8 +568,6 @@ static void ci_hdrc_imx_remove(struct platform_device *pdev)
                clk_disable_unprepare(data->clk_wakeup);
                if (data->plat_data->flags & CI_HDRC_PMQOS)
                        cpu_latency_qos_remove_request(&data->pm_qos_req);
-               if (data->hsic_pad_regulator)
-                       regulator_disable(data->hsic_pad_regulator);
        }
        if (data->usbmisc_data)
                put_device(data->usbmisc_data->dev);