linux-kernel - [BACKPORT 4.4.y 09/25] usb: dwc3: gadget: Fix suspend/resume during device mode

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Date:   Fri, 22 Mar 2019 16:44:00 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     stable@...r.kernel.org, Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Roger Quadros <rogerq@...com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>,
        Thinh Nguyen <thinh.nguyen@...opsys.com>,
        Anurag Kumar Vulisha <anurag.kumar.vulisha@...inx.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [BACKPORT 4.4.y 09/25] usb: dwc3: gadget: Fix suspend/resume during device mode

From: Roger Quadros <rogerq@...com>

Gadget controller might not be always active during system
suspend/resume as gadget driver might not have yet been loaded or
might have been unloaded prior to system suspend.

Check if we're active and only then perform
necessary actions during suspend/resume.

Signed-off-by: Roger Quadros <rogerq@...com>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
(cherry picked from commit 9772b47a4c2916d645c551228b6085ea24acbe5d)
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/usb/dwc3/gadget.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index b6037a0ae829..58e67c228971 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2893,6 +2893,9 @@ void dwc3_gadget_exit(struct dwc3 *dwc)
 
 int dwc3_gadget_suspend(struct dwc3 *dwc)
 {
+	if (!dwc->gadget_driver)
+		return 0;
+
 	if (dwc->pullups_connected) {
 		dwc3_gadget_disable_irq(dwc);
 		dwc3_gadget_run_stop(dwc, true, true);
@@ -2911,6 +2914,9 @@ int dwc3_gadget_resume(struct dwc3 *dwc)
 	struct dwc3_ep		*dep;
 	int			ret;
 
+	if (!dwc->gadget_driver)
+		return 0;
+
 	/* Start with SuperSpeed Default */
 	dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
 
-- 
2.20.0