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

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Date:   Wed, 18 Oct 2017 19:32:15 +0800
From:   jeffy <jeffy.chen@...k-chips.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
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

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 :)