From: Greg KH <gregkh@linuxfoundation.org>
To: Jia-Ju Bai <baijiaju1990@163.com>
Cc: forest@alittletooquiet.net, simon@nikanor.nu, tvboxspy@gmail.com,
scott@matheina.com, dan.a.cashman@gmail.com,
golubev.mikhail@gmail.com, bhelgaas@google.com,
devel@driverdev.osuosl.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-pci@vger.kernel.org
Subject: Re: [BUG] vt6655: A possible sleep-in-atomic bug in vt6655_suspend
Date: Mon, 9 Oct 2017 07:43:27 +0200 [thread overview]
Message-ID: <20171009054327.GA12559@kroah.com> (raw)
In-Reply-To: <f3f4b129-471e-6ccd-a2fa-6ffd915bcb7f@163.com>
On Mon, Oct 09, 2017 at 09:10:28AM +0800, Jia-Ju Bai wrote:
> According to device_main.c, the driver may sleep under a spinlock,
> and the function call path is:
> vt6655_suspend (acquire the spinlock)
> pci_set_power_state
> __pci_start_power_transition (drivers/pci/pci.c)
> msleep --> may sleep
>
> A possible fix is to replace msleep with mdelay in
> __pci_start_power_transition in drivers/pci/pci.c.
Patches are usually best to send in for things that you find like this.
thanks,
greg k-h
next prev parent reply other threads:[~2017-10-09 5:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-09 1:10 [BUG] vt6655: A possible sleep-in-atomic bug in vt6655_suspend Jia-Ju Bai
2017-10-09 5:43 ` Greg KH [this message]
2017-10-09 7:56 ` Jia-Ju Bai
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20171009054327.GA12559@kroah.com \
--to=gregkh@linuxfoundation.org \
--cc=baijiaju1990@163.com \
--cc=bhelgaas@google.com \
--cc=dan.a.cashman@gmail.com \
--cc=devel@driverdev.osuosl.org \
--cc=forest@alittletooquiet.net \
--cc=golubev.mikhail@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=scott@matheina.com \
--cc=simon@nikanor.nu \
--cc=tvboxspy@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox