[PATCH] usb: udc: core: Use lock for soft_connect

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Use lock to guard against concurrent access for soft-connect/disconnect
operations when writing to soft_connect sysfs.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 2ccea03a8f7e ("usb: gadget: introduce UDC Class")
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
---
 drivers/usb/gadget/udc/core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index 6a62bbd01324..44c67e765167 100644
--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -1530,7 +1530,9 @@ static ssize_t soft_connect_store(struct device *dev,
 {
 	struct usb_udc		*udc = container_of(dev, struct usb_udc, dev);
 
+	mutex_lock(&udc_lock);
 	if (!udc->driver) {
+		mutex_unlock(&udc_lock);
 		dev_err(dev, "soft-connect without a gadget driver\n");
 		return -EOPNOTSUPP;
 	}
@@ -1542,10 +1544,12 @@ static ssize_t soft_connect_store(struct device *dev,
 		usb_gadget_disconnect(udc->gadget);
 		usb_gadget_udc_stop(udc);
 	} else {
+		mutex_unlock(&udc_lock);
 		dev_err(dev, "unsupported command '%s'\n", buf);
 		return -EINVAL;
 	}
 
+	mutex_unlock(&udc_lock);
 	return n;
 }
 static DEVICE_ATTR_WO(soft_connect);

base-commit: 4e0dcf62ab4cf917d0cbe751b8bf229a065248d4
-- 
2.28.0




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