linux-kernel - [PATCH 5.4 034/120] usb: dwc3: gadget: Avoid duplicate requests to enable Run/Stop

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Date:   Mon, 26 Sep 2022 12:11:07 +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>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 034/120] usb: dwc3: gadget: Avoid duplicate requests to enable Run/Stop

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

[ Upstream commit 040f2dbd2010c43f33ad27249e6dac48456f4d99 ]

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>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/dwc3/gadget.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 4f3548c682ec..a40935f3592b 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2043,9 +2043,6 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
 
 	is_on = !!is_on;
 
-	if (dwc->pullups_connected == is_on)
-		return 0;
-
 	dwc->softconnect = is_on;
 	/*
 	 * Per databook, when we want to stop the gadget, if a control transfer
@@ -2082,6 +2079,11 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
 		return 0;
 	}
 
+	if (dwc->pullups_connected == is_on) {
+		pm_runtime_put(dwc->dev);
+		return 0;
+	}
+
 	if (!is_on) {
 		ret = dwc3_gadget_soft_disconnect(dwc);
 	} else {
-- 
2.35.1