linux-kernel - [BUG] drivers/usb/host/isp116x-hcd: a possible sleep-in-atomic bug in isp116x

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Date:   Tue, 12 Dec 2017 11:23:06 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     ok@...ecdesign.ee, Greg KH <gregkh@...uxfoundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-usb@...r.kernel.org
Subject: [BUG] drivers/usb/host/isp116x-hcd: a possible sleep-in-atomic bug in
 isp116x_start

According to drivers/usb/host/isp116x-hcd.c, the kernel module may sleep 
under a spinlock.
The function call path is:
isp116x_start (acquire the spinlock)
   device_init_wakeup
     device_wakeup_enable
       wakeup_source_register
         wakeup_source_create
           kmalloc(GFP_KERNEL) --> may sleep

I do not find a good way to fix it, so I only report.
This possible bug is found by my static analysis tool (DSAC) and checked 
by my code review.


Thanks,
Jia-Ju Bai