Patch "usb: gadget: udc: renesas_usb3: fix pm_runtime functions calling" has been added to the 4.11-stable tree

Patch "usb: gadget: udc: renesas_usb3: fix pm_runtime functions calling" has been added to the 4.11-stable tree

[gregkh]

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 4.11-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-4.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From cdc876877ebc3f0677b267756d4564e2a429e730 Mon Sep 17 00:00:00 2001
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
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@renesas.com>

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@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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@renesas.com are

queue-4.11/usb-gadget-udc-renesas_usb3-fix-deadlock-by-spinlock.patch
queue-4.11/phy-rcar-gen3-usb2-fix-implementation-for-runtime-pm.patch
queue-4.11/usb-gadget-udc-renesas_usb3-fix-pm_runtime-functions-calling.patch
queue-4.11/usb-gadget-udc-renesas_usb3-lock-for-pn_-registers-access.patch