This is a note to let you know that I've just added the patch titled usb: gadget: udc: renesas_usb3: fix pm_runtime functions calling to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: usb-gadget-udc-renesas_usb3-fix-pm_runtime-functions-calling.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From cdc876877ebc3f0677b267756d4564e2a429e730 Mon Sep 17 00:00:00 2001 From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> Date: Wed, 26 Apr 2017 20:50:07 +0900 Subject: usb: gadget: udc: renesas_usb3: fix pm_runtime functions calling From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> commit cdc876877ebc3f0677b267756d4564e2a429e730 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: 746bfe63bba3 ("usb: gadget: renesas_usb3: add support for Renesas USB3.0 peripheral controller") Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/gadget/udc/renesas_usb3.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) --- a/drivers/usb/gadget/udc/renesas_usb3.c +++ b/drivers/usb/gadget/udc/renesas_usb3.c @@ -1707,6 +1707,9 @@ static int renesas_usb3_start(struct usb /* 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_ 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 pl { 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 pla 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; Patches currently in stable-queue which might be from yoshihiro.shimoda.uh@xxxxxxxxxxx are queue-4.9/usb-gadget-udc-renesas_usb3-fix-deadlock-by-spinlock.patch queue-4.9/usb-gadget-udc-renesas_usb3-fix-pm_runtime-functions-calling.patch queue-4.9/usb-gadget-udc-renesas_usb3-lock-for-pn_-registers-access.patch