From: Jia-Ju Bai <baijiaju1990@gmail.com>
To: ok@artecdesign.ee, Greg KH <gregkh@linuxfoundation.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-usb@vger.kernel.org
Subject: [BUG] drivers/usb/host/isp116x-hcd: a possible sleep-in-atomic bug in isp116x_start
Date: Tue, 12 Dec 2017 11:23:06 +0800 [thread overview]
Message-ID: <ef8b53a7-7420-51e0-6220-7633edeadbf5@gmail.com> (raw)
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
reply other threads:[~2017-12-12 3:23 UTC|newest]
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