linux-kernel - [PATCH 5.15 138/172] usb: dwc2: drd: fix soft connect when gadget is unconfigured

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Message-Id: <20220214092511.164824295@linuxfoundation.org>
Date:   Mon, 14 Feb 2022 10:26:36 +0100
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@...nel.org,
        Amelie Delaunay <amelie.delaunay@...s.st.com>,
        Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>,
        Fabrice Gasnier <fabrice.gasnier@...s.st.com>
Subject: [PATCH 5.15 138/172] usb: dwc2: drd: fix soft connect when gadget is unconfigured

From: Fabrice Gasnier <fabrice.gasnier@...s.st.com>

commit 269cbcf7b72de6f0016806d4a0cec1d689b55a87 upstream.

When the gadget driver hasn't been (yet) configured, and the cable is
connected to a HOST, the SFTDISCON gets cleared unconditionally, so the
HOST tries to enumerate it.
At the host side, this can result in a stuck USB port or worse. When
getting lucky, some dmesg can be observed at the host side:
 new high-speed USB device number ...
 device descriptor read/64, error -110

Fix it in drd, by checking the enabled flag before calling
dwc2_hsotg_core_connect(). It will be called later, once configured,
by the normal flow:
- udc_bind_to_driver
 - usb_gadget_connect
   - dwc2_hsotg_pullup
     - dwc2_hsotg_core_connect

Fixes: 17f934024e84 ("usb: dwc2: override PHY input signals with usb role switch support")
Cc: stable@...nel.org
Reviewed-by: Amelie Delaunay <amelie.delaunay@...s.st.com>
Acked-by: Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...s.st.com>
Link: https://lore.kernel.org/r/1644423353-17859-1-git-send-email-fabrice.gasnier@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/dwc2/drd.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/usb/dwc2/drd.c
+++ b/drivers/usb/dwc2/drd.c
@@ -109,8 +109,10 @@ static int dwc2_drd_role_sw_set(struct u
 		already = dwc2_ovr_avalid(hsotg, true);
 	} else if (role == USB_ROLE_DEVICE) {
 		already = dwc2_ovr_bvalid(hsotg, true);
-		/* This clear DCTL.SFTDISCON bit */
-		dwc2_hsotg_core_connect(hsotg);
+		if (hsotg->enabled) {
+			/* This clear DCTL.SFTDISCON bit */
+			dwc2_hsotg_core_connect(hsotg);
+		}
 	} else {
 		if (dwc2_is_device_mode(hsotg)) {
 			if (!dwc2_ovr_bvalid(hsotg, false))