linux-kernel - Re: [PATCH 1/2] driver core: tell caller if the device/kboject is really released

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Date:   Thu, 30 Sep 2021 15:22:14 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Changhui Zhong <czhong@...hat.com>,
        Yi Zhang <yi.zhang@...hat.com>
Subject: Re: [PATCH 1/2] driver core: tell caller if the device/kboject is
 really released

On Thu, Sep 30, 2021 at 07:51:35AM +0200, Greg Kroah-Hartman wrote:
> On Thu, Sep 30, 2021 at 01:20:27PM +0800, Ming Lei wrote:
> > Return if the device/kobject is really released to caller.
> > 
> > One use case is scsi_device_put() and the scsi device's release handler
> > runs async work to clean up things. We have to piggyback the module_put()
> > into the async work for avoiding to touch unmapped module page.
> > 
> > Signed-off-by: Ming Lei <ming.lei@...hat.com>
> > ---
> >  drivers/base/core.c     | 5 +++--
> >  include/linux/device.h  | 2 +-
> >  include/linux/kobject.h | 2 +-
> >  lib/kobject.c           | 5 +++--
> >  4 files changed, 8 insertions(+), 6 deletions(-)
> 
> I really don't like this as you should not ever care if you are
> releasing the last reference on an object or not.
> 
> Why are you needing this?
> 
> And if you really do need this, you MUST document how this works in the
> apis you are changing here, so I can't take this as is sorry.

Please ignore this series, and I have one better approach to address the
issue, will send it out soon.


Thanks,
Ming