linux-kernel - Re: [RFC PATCH] char: misc: Init misc->list in a safe way

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Message-ID: <20170629070344.GA9037@kroah.com>
Date:   Thu, 29 Jun 2017 09:03:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Chunyan Zhang <zhang.lyra@...il.com>
Cc:     Orson Zhai (翟京) <orson.zhai@...eadtrum.com>,
        Arnd Bergmann <arnd@...db.de>,
        Zhongping Tan (谭中平) 
        <Zhongping.Tan@...eadtrum.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        songhe.wei@...eadtrum.com
Subject: Re: [RFC PATCH] char: misc: Init misc->list in a safe way

On Thu, Jun 29, 2017 at 02:54:23PM +0800, Chunyan Zhang wrote:
> Hi Greg,
> 
> On 28 June 2017 at 19:21, Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
> > On Wed, Jun 28, 2017 at 12:34:28PM +0200, Arnd Bergmann wrote:
> >> On Wed, Jun 28, 2017 at 7:18 AM, Greg Kroah-Hartman
> >> <gregkh@...uxfoundation.org> wrote:
> >> > On Wed, Jun 28, 2017 at 09:54:32AM +0800, Orson Zhai wrote:
> >> >> We found the device is "fm". We highly suspect that fm driver call
> >> >> misc_register twice and reinitialize list to make ->pre & ->next
> >> >> pointing to himself.
> >> >>
> >> >> Meanwhile, we checked fm driver and found nothing obviously wrong in the code.
> >> >
> >> > Do you have a pointer to this driver?  Is it in the kernel tree?
> >>
> >> I found a version of some spreadtrum FM driver in the sources for the
> >> Samsung Galaxy
> >> J3, this is the driver https://pastebin.com/p7Y7xQNE
> >
> > Ah nice, Orson, is that the driver?
> 
> For some unknown reason, Orson was missing in this list :)
> I'm adding him back.
> 
> This is not the latest version of our FM driver.  You can find the
> version we're using within Spreadtrum here [1], and the kernel version
> we're using is v4.4.49.

You forgot the link in your footnote, so we can read the code :)

> > Any objection for me adding it to the kernel tree so we can fix up the
> 
> We have no objection to adding this driver to the kernel tree.

Great, want me to make up the patch, or do you want to?

thanks,

greg k-h