usb: gadget: udc: renesas_usb3: should call pm_runtime_enable() before add udc

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>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c
index 4ef2386c3ac457aebfc229b2c032a8ea49192ffe..8bf3ae1f354105c0fffcc2028b6fa44e3507a211 100644 (file)
--- a/drivers/usb/gadget/udc/renesas_usb3.c
+++ b/drivers/usb/gadget/udc/renesas_usb3.c
@@ -2634,6 +2634,7 @@ 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;
@@ -2655,7 +2656,6 @@ 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;