linux-kernel - [PATCH 5.19 111/155] usb: dwc3: gadget: Avoid duplicate requests to enable Run/Stop

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Message-Id: <20220906132834.161346397@linuxfoundation.org>
Date:   Tue,  6 Sep 2022 15:30:59 +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 <stable@...nel.org>,
        Wesley Cheng <quic_wcheng@...cinc.com>
Subject: [PATCH 5.19 111/155] usb: dwc3: gadget: Avoid duplicate requests to enable Run/Stop

From: Wesley Cheng <quic_wcheng@...cinc.com>

commit 040f2dbd2010c43f33ad27249e6dac48456f4d99 upstream.

Relocate the pullups_connected check until after it is ensured that there
are no runtime PM transitions.  If another context triggered the DWC3
core's runtime resume, it may have already enabled the Run/Stop.  Do not
re-run the entire pullup sequence again, as it may issue a core soft
reset while Run/Stop is already set.

This patch depends on
  commit 69e131d1ac4e ("usb: dwc3: gadget: Prevent repeat pullup()")

Fixes: 77adb8bdf422 ("usb: dwc3: gadget: Allow runtime suspend if UDC unbinded")
Cc: stable <stable@...nel.org>
Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
Link: https://lore.kernel.org/r/20220728020647.9377-1-quic_wcheng@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/dwc3/gadget.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2538,9 +2538,6 @@ static int dwc3_gadget_pullup(struct usb
 
 	is_on = !!is_on;
 
-	if (dwc->pullups_connected == is_on)
-		return 0;
-
 	dwc->softconnect = is_on;
 
 	/*
@@ -2564,6 +2561,11 @@ static int dwc3_gadget_pullup(struct usb
 		pm_runtime_put(dwc->dev);
 		return 0;
 	}
+
+	if (dwc->pullups_connected == is_on) {
+		pm_runtime_put(dwc->dev);
+		return 0;
+	}
 
 	if (!is_on) {
 		ret = dwc3_gadget_soft_disconnect(dwc);