usb: dwc3: fix runtime PM in error path

If there is a failure after pm_runtime_enable/get_sync()
we need to call pm_runtime_disable/put_sync().

Otherwise it will lead to an unbalanced pm_runtime_enable() on the
subsequent probe if the earlier probe bailed out due to -EPROBE_DEFER.

pm_runtime_get_sync() can fail as well so deal with that case too.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 8fceeb1..ca22e48 100644 (file)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -965,14 +965,17 @@ static int dwc3_probe(struct platform_device *pdev)
        pm_runtime_use_autosuspend(dev);
        pm_runtime_set_autosuspend_delay(dev, DWC3_DEFAULT_AUTOSUSPEND_DELAY);
        pm_runtime_enable(dev);
-       pm_runtime_get_sync(dev);
+       ret = pm_runtime_get_sync(dev);
+       if (ret < 0)
+               goto err1;
+
        pm_runtime_forbid(dev);
 
        ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_SIZE);
        if (ret) {
                dev_err(dwc->dev, "failed to allocate event buffers\n");
                ret = -ENOMEM;
-               goto err0;
+               goto err2;
        }
 
        if (IS_ENABLED(CONFIG_USB_DWC3_HOST) &&
@@ -989,12 +992,12 @@ static int dwc3_probe(struct platform_device *pdev)
 
        ret = dwc3_alloc_scratch_buffers(dwc);
        if (ret)
-               goto err1;
+               goto err3;
 
        ret = dwc3_core_init(dwc);
        if (ret) {
                dev_err(dev, "failed to initialize core\n");
-               goto err2;
+               goto err4;
        }
 
        /* Check the maximum_speed parameter */
@@ -1026,23 +1029,30 @@ static int dwc3_probe(struct platform_device *pdev)
 
        ret = dwc3_core_init_mode(dwc);
        if (ret)
-               goto err3;
+               goto err5;
 
        dwc3_debugfs_init(dwc);
        pm_runtime_put(dev);
 
        return 0;
 
-err3:
+err5:
        dwc3_event_buffers_cleanup(dwc);
 
-err2:
+err4:
        dwc3_free_scratch_buffers(dwc);
 
-err1:
+err3:
        dwc3_free_event_buffers(dwc);
        dwc3_ulpi_exit(dwc);
 
+err2:
+       pm_runtime_allow(&pdev->dev);
+
+err1:
+       pm_runtime_put_sync(&pdev->dev);
+       pm_runtime_disable(&pdev->dev);
+
 err0:
        /*
         * restore res->start back to its original value so that, in case the