linux-kernel - [PATCH 5.11 078/342] usb: dwc3: gadget: Ignore EP queue requests during bus reset

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Date:   Mon, 10 May 2021 12:17:48 +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, Wesley Cheng <wcheng@...eaurora.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 078/342] usb: dwc3: gadget: Ignore EP queue requests during bus reset

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

[ Upstream commit 71ca43f30df9c642970f9dc9b2d6f463f4967e7b ]

The current dwc3_gadget_reset_interrupt() will stop any active
transfers, but only addresses blocking of EP queuing for while we are
coming from a disconnected scenario, i.e. after receiving the disconnect
event.  If the host decides to issue a bus reset on the device, the
connected parameter will still be set to true, allowing for EP queuing
to continue while we are disabling the functions.  To avoid this, set the
connected flag to false until the stop active transfers is complete.

Signed-off-by: Wesley Cheng <wcheng@...eaurora.org>
Link: https://lore.kernel.org/r/1616146285-19149-3-git-send-email-wcheng@codeaurora.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/dwc3/gadget.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 65ff41e3a18e..5b5520286eff 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -3267,6 +3267,15 @@ static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
 {
 	u32			reg;
 
+	/*
+	 * Ideally, dwc3_reset_gadget() would trigger the function
+	 * drivers to stop any active transfers through ep disable.
+	 * However, for functions which defer ep disable, such as mass
+	 * storage, we will need to rely on the call to stop active
+	 * transfers here, and avoid allowing of request queuing.
+	 */
+	dwc->connected = false;
+
 	/*
 	 * WORKAROUND: DWC3 revisions <1.88a have an issue which
 	 * would cause a missing Disconnect Event if there's a
-- 
2.30.2