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usb: gadget: udc: renesas_usb3: fix pm_runtime functions calling

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commit cdc876877e upstream.

This patch fixes an issue that this driver is possible to access
the registers before pm_runtime_get_sync() if a gadget driver is
installed first. After that, oops happens on R-Car Gen3 environment.
To avoid it, this patch changes the pm_runtime call timing from
probe/remove to udc_start/udc_stop.

Fixes: 746bfe63bb ("usb: gadget: renesas_usb3: add support for Renesas USB3.0 peripheral controller")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yoshihiro Shimoda
2017-04-26 20:50:07 +09:00
committed by Greg Kroah-Hartman
parent b51e4b0ac6
commit 723bd3b9f8
1 changed files with 6 additions and 6 deletions
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12
drivers/usb/gadget/udc/renesas_usb3.c
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@@ -1707,6 +1707,9 @@ static int renesas_usb3_start(struct usb_gadget *gadget,
/* hook up the driver */
usb3->driver = driver;
pm_runtime_enable(usb3_to_dev(usb3));
pm_runtime_get_sync(usb3_to_dev(usb3));
renesas_usb3_init_controller(usb3);
return 0;
@@ -1724,6 +1727,9 @@ static int renesas_usb3_stop(struct usb_gadget *gadget)
renesas_usb3_stop_controller(usb3);
spin_unlock_irqrestore(&usb3->lock, flags);
pm_runtime_put(usb3_to_dev(usb3));
pm_runtime_disable(usb3_to_dev(usb3));
return 0;
}
@@ -1761,9 +1767,6 @@ static int renesas_usb3_remove(struct platform_device *pdev)
{
struct renesas_usb3 *usb3 = platform_get_drvdata(pdev);
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
usb_del_gadget_udc(&usb3->gadget);
__renesas_usb3_ep_free_request(usb3->ep0_req);
@@ -1948,9 +1951,6 @@ static int renesas_usb3_probe(struct platform_device *pdev)
usb3->workaround_for_vbus = priv->workaround_for_vbus;
pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
dev_info(&pdev->dev, "probed\n");
return 0;