linux-kernel - [PATCH v1 2/2] usb: gadget: udc: core: Prevent redundant calls to pullup

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Message-ID: <20230405093133.1858140-2-badhri@google.com>
Date:   Wed,  5 Apr 2023 09:31:33 +0000
From:   Badhri Jagan Sridharan <badhri@...gle.com>
To:     gregkh@...uxfoundation.org, stern@...land.harvard.edu,
        colin.i.king@...il.com, xuetao09@...wei.com,
        quic_eserrao@...cinc.com, water.zhangjiantao@...wei.com,
        peter.chen@...escale.com, balbi@...com
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Badhri Jagan Sridharan <badhri@...gle.com>
Subject: [PATCH v1 2/2] usb: gadget: udc: core: Prevent redundant calls to pullup

usb_gadget_connect calls gadget->ops->pullup without
checking whether gadget->connected was previously set.
Make this symmetric to usb_gadget_disconnect by returning
early if gadget->connected is already set.

Cc: stable@...r.kernel.org

Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>
Fixes: 5a1da544e572 ("usb: gadget: core: do not try to disconnect gadget if it is not connected")
---
 drivers/usb/gadget/udc/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index 890f92cb6344..7eeaf7dbb350 100644
--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -708,6 +708,9 @@ int usb_gadget_connect(struct usb_gadget *gadget)
 		goto out;
 	}
 
+	if (gadget->connected)
+		goto out;
+
 	if (gadget->deactivated) {
 		/*
 		 * If gadget is deactivated we only save new state.
-- 
2.40.0.348.gf938b09366-goog