linux-kernel - [PATCH 4.17 21/45] usb: gadget: udc: renesas_usb3: should call pm_runtime

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Date:   Thu, 14 Jun 2018 16:04:12 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Simon Horman <horms+renesas@...ge.net.au>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>
Subject: [PATCH 4.17 21/45] usb: gadget: udc: renesas_usb3: should call pm_runtime_enable() before add udc

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>

commit d998844016b24a8d71b9aa5eae7e51d70f2de438 upstream.

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@...r.kernel.org> # v4.15+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Reviewed-by: Simon Horman <horms+renesas@...ge.net.au>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/gadget/udc/renesas_usb3.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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 pla
 	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 pla
 	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;