linux-kernel - [PATCH 5.4 07/27] usb: dwc3: gadget: Restart DWC3 gadget when enabling pullup

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Message-Id: <20210813150523.611480691@linuxfoundation.org>
Date:   Fri, 13 Aug 2021 17:07:05 +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,
        "stable@...r.kernel.org, Wesley Cheng" <wcheng@...eaurora.org>,
        Michael Tretter <m.tretter@...gutronix.de>,
        Wesley Cheng <wcheng@...eaurora.org>
Subject: [PATCH 5.4 07/27] usb: dwc3: gadget: Restart DWC3 gadget when enabling pullup

From: Wesley Cheng <wcheng@...eaurora.org>

[ Upstream commit a1383b3537a7bea1c213baa7878ccc4ecf4413b5 ]

usb_gadget_deactivate/usb_gadget_activate does not execute the UDC start
operation, which may leave EP0 disabled and event IRQs disabled when
re-activating the function. Move the enabling/disabling of USB EP0 and
device event IRQs to be performed in the pullup routine.

Fixes: ae7e86108b12 ("usb: dwc3: Stop active transfers before halting the controller")
Tested-by: Michael Tretter <m.tretter@...gutronix.de>
Cc: stable <stable@...r.kernel.org>
Reported-by: Michael Tretter <m.tretter@...gutronix.de>
Signed-off-by: Wesley Cheng <wcheng@...eaurora.org>
Link: https://lore.kernel.org/r/1609282837-21666-1-git-send-email-wcheng@codeaurora.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/dwc3/gadget.c |   14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1993,6 +1993,7 @@ static int dwc3_gadget_run_stop(struct d
 
 static void dwc3_gadget_disable_irq(struct dwc3 *dwc);
 static void __dwc3_gadget_stop(struct dwc3 *dwc);
+static int __dwc3_gadget_start(struct dwc3 *dwc);
 
 static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
 {
@@ -2067,6 +2068,8 @@ static int dwc3_gadget_pullup(struct usb
 						dwc->ev_buf->length;
 		}
 		dwc->connected = false;
+	} else {
+		__dwc3_gadget_start(dwc);
 	}
 
 	ret = dwc3_gadget_run_stop(dwc, is_on, false);
@@ -2244,10 +2247,6 @@ static int dwc3_gadget_start(struct usb_
 	}
 
 	dwc->gadget_driver	= driver;
-
-	if (pm_runtime_active(dwc->dev))
-		__dwc3_gadget_start(dwc);
-
 	spin_unlock_irqrestore(&dwc->lock, flags);
 
 	return 0;
@@ -2273,13 +2272,6 @@ static int dwc3_gadget_stop(struct usb_g
 	unsigned long		flags;
 
 	spin_lock_irqsave(&dwc->lock, flags);
-
-	if (pm_runtime_suspended(dwc->dev))
-		goto out;
-
-	__dwc3_gadget_stop(dwc);
-
-out:
 	dwc->gadget_driver	= NULL;
 	spin_unlock_irqrestore(&dwc->lock, flags);