linux-kernel - [PATCH 4.4 082/162] usb: gadget: configfs: Fix missing spin_lock

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Date:   Thu, 19 Dec 2019 19:33:10 +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, Wei Yongjun <weiyongjun1@...wei.com>,
        Peter Chen <peter.chen@....com>
Subject: [PATCH 4.4 082/162] usb: gadget: configfs: Fix missing spin_lock_init()

From: Wei Yongjun <weiyongjun1@...wei.com>

commit 093edc2baad2c258b1f55d1ab9c63c2b5ae67e42 upstream.

The driver allocates the spinlock but not initialize it.
Use spin_lock_init() on it to initialize it correctly.

This is detected by Coccinelle semantic patch.

Fixes: 1a1c851bbd70 ("usb: gadget: configfs: fix concurrent issue between composite APIs")
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
Cc: stable <stable@...r.kernel.org>
Reviewed-by: Peter Chen <peter.chen@....com>
Link: https://lore.kernel.org/r/20191030034046.188808-1-weiyongjun1@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/gadget/configfs.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/usb/gadget/configfs.c
+++ b/drivers/usb/gadget/configfs.c
@@ -1542,6 +1542,7 @@ static struct config_group *gadgets_make
 	gi->composite.resume = NULL;
 	gi->composite.max_speed = USB_SPEED_SUPER;
 
+	spin_lock_init(&gi->spinlock);
 	mutex_init(&gi->lock);
 	INIT_LIST_HEAD(&gi->string_list);
 	INIT_LIST_HEAD(&gi->available_func);