linux-kernel - Re: [PATCH V2 1/2] driver core: Add ability to delete device links of unregistered devices

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Date:   Fri, 9 Jul 2021 13:19:37 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Saravana Kannan <saravanak@...gle.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "open list:TARGET SUBSYSTEM" <linux-scsi@...r.kernel.org>,
        Avri Altman <avri.altman@....com>,
        Bean Huo <huobean@...il.com>, Can Guo <cang@...eaurora.org>,
        Asutosh Das <asutoshd@...eaurora.org>,
        Bart Van Assche <bvanassche@....org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 1/2] driver core: Add ability to delete device links of
 unregistered devices

On Fri, Jul 9, 2021 at 11:55 AM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Fri, Jul 09, 2021 at 09:43:40AM +0300, Adrian Hunter wrote:
> > Managed device links are deleted by device_del(). However it is possible to
> > add a device link to a consumer before device_add(), and then discover an
> > error prevents the device from being used. In that case normally references
> > to the device would be dropped and the device would be deleted. However the
> > device link holds a reference to the device, so the device link and device
> > remain indefinitely.
>
> Why are you not just manually removing the link you just created?  You
> manually added it, you know something failed so you need to clean up, so
> why not clean this up too?

His changes are needed to do just that.