linux-kernel - Re: [PATCH] driver core: Make sure device detached from driver before deleting it

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 18 Oct 2017 13:32:50 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     jeffy <jeffy.chen@...k-chips.com>
Cc:     linux-kernel@...r.kernel.org, dmitry.torokhov@...il.com,
        heiko@...ech.de, briannorris@...omium.org, dianders@...omium.org,
        tfiga@...omium.org, broonie@...nel.org, seanpaul@...omium.org,
        thierry.reding@...il.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] driver core: Make sure device detached from driver before deleting it

On Wednesday, October 18, 2017 1:32:15 PM CEST jeffy wrote:
> Hi Rafael,
> 
> On 10/18/2017 07:11 PM, jeffy wrote:
> >>
> > my board has these devices:
> > spi master device->spi child device->spi based pwm->pwm_bl
> >
> > and i add a device link to the pwm and pwm_bl, and got a warning about
> > the pwm not unbound:
> sorry, it happens when i try to unbind the spi child device, and it's 
> warning about the consumer(pwm_bl) not unbound.
> >
> > static void device_links_purge(struct device *dev)
> > {
> > ...
> >          list_for_each_entry_safe_reverse(link, ln,
> > &dev->links.consumers, s_node) {
> >                  WARN_ON(link->status != DL_STATE_DORMANT &&
> >                          link->status != DL_STATE_NONE); <-- warning here!
> >                  __device_link_del(link);
> >          }
> 
> and i've send a new patch to reorder the device_links_purge() and 
> bus_remove_device, thanks again :)

Which I'm not sure is the right approach just yet.

I'll follow up in the patch thread in any case.

Thanks,
Rafael