[PATCH 3/4] usb: gadget: udc: renesas_usb3: should call pm_runtime_enable() before add udc

[Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>]

This patch fixes an issue that this driver causes panic if a gadget
driver is already loaded because usb_add_gadget_udc() might call
renesas_usb3_start() via .udc_start, and then pm_runtime_get_sync()
in renesas_usb3_start() doesn't work correctly.
Note that the usb3_to_dev() macro should not be called at this timing
because the macro uses the gadget structure.

Fixes: cf06df3fae28 ("usb: gadget: udc: renesas_usb3: move pm_runtime_{en,dis}able()")
Cc: <stable@vger.kernel.org> # v4.15+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 drivers/usb/gadget/udc/renesas_usb3.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c
index 1c54a77..738b734 100644
--- a/drivers/usb/gadget/udc/renesas_usb3.c
+++ b/drivers/usb/gadget/udc/renesas_usb3.c
@@ -2632,6 +2632,7 @@ static int renesas_usb3_probe(struct platform_device *pdev)
 	if (ret < 0)
 		goto err_alloc_prd;
 
+	pm_runtime_enable(&pdev->dev);
 	ret = usb_add_gadget_udc(&pdev->dev, &usb3->gadget);
 	if (ret < 0)
 		goto err_add_udc;
@@ -2653,7 +2654,6 @@ static int renesas_usb3_probe(struct platform_device *pdev)
 	renesas_usb3_debugfs_init(usb3, &pdev->dev);
 
 	dev_info(&pdev->dev, "probed%s\n", usb3->phy ? " with phy" : "");
-	pm_runtime_enable(usb3_to_dev(usb3));
 
 	return 0;
 
-- 
1.9.1