linux-kernel - [PATCH AUTOSEL 4.14 8/9] usb: dwc2: gadget: don't try to disable ep0 in dwc2_hsotg

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Message-Id: <20220203203633.4685-8-sashal@kernel.org>
Date:   Thu,  3 Feb 2022 15:36:32 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Amelie Delaunay <amelie.delaunay@...s.st.com>,
        Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, hminas@...opsys.com,
        linux-usb@...r.kernel.org
Subject: [PATCH AUTOSEL 4.14 8/9] usb: dwc2: gadget: don't try to disable ep0 in dwc2_hsotg_suspend

From: Amelie Delaunay <amelie.delaunay@...s.st.com>

[ Upstream commit ac55d163855924aa5af9f1560977da8f346963c8 ]

Calling dwc2_hsotg_ep_disable on ep0 (in/out) will lead to the following
logs before returning -EINVAL:
dwc2 49000000.usb-otg: dwc2_hsotg_ep_disable: called for ep0
dwc2 49000000.usb-otg: dwc2_hsotg_ep_disable: called for ep0

To avoid these two logs while suspending, start disabling the endpoint
from the index 1, as done in dwc2_hsotg_udc_stop:

	/* all endpoints should be shutdown */
	for (ep = 1; ep < hsotg->num_of_eps; ep++) {
		if (hsotg->eps_in[ep])
			dwc2_hsotg_ep_disable_lock(&hsotg->eps_in[ep]->ep);
		if (hsotg->eps_out[ep])
			dwc2_hsotg_ep_disable_lock(&hsotg->eps_out[ep]->ep);
	}

Acked-by: Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@...s.st.com>
Link: https://lore.kernel.org/r/20211207130101.270314-1-amelie.delaunay@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/dwc2/gadget.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index f1edc5727000c..dddc5d02b5524 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -4783,7 +4783,7 @@ int dwc2_hsotg_suspend(struct dwc2_hsotg *hsotg)
 		hsotg->gadget.speed = USB_SPEED_UNKNOWN;
 		spin_unlock_irqrestore(&hsotg->lock, flags);
 
-		for (ep = 0; ep < hsotg->num_of_eps; ep++) {
+		for (ep = 1; ep < hsotg->num_of_eps; ep++) {
 			if (hsotg->eps_in[ep])
 				dwc2_hsotg_ep_disable(&hsotg->eps_in[ep]->ep);
 			if (hsotg->eps_out[ep])
-- 
2.34.1