linux-kernel - Re: [driver-core PATCH v9 1/9] driver core: Establish order of operations for device_add and device

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Message-ID: <20181220152844.GA27498@kroah.com>
Date:   Thu, 20 Dec 2018 16:28:44 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     alexander.h.duyck@...ux.intel.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        Tejun Heo <tj@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        zwisler@...nel.org, Dan Williams <dan.j.williams@...el.com>,
        dave.jiang@...el.com, bvanassche@....org
Subject: Re: [driver-core PATCH v9 1/9] driver core: Establish order of
 operations for device_add and device_del via bitflag

On Wed, Dec 19, 2018 at 03:27:48PM +0100, Rafael J. Wysocki wrote:
> On Thu, Dec 13, 2018 at 1:45 AM Alexander Duyck
> <alexander.h.duyck@...ux.intel.com> wrote:
> >
> > Add an additional bit flag to the device struct named "dead".
> >
> > This additional flag provides a guarantee that when a device_del is
> > executed on a given interface an async worker will not attempt to attach
> > the driver following the earlier device_del call. Previously this
> > guarantee was not present and could result in the device_del call
> > attempting to remove a driver from an interface only to have the async
> > worker attempt to probe the driver later when it finally completes the
> > asynchronous probe call.
> >
> > One additional change added was that I pulled the check for dev->driver
> > out of the __device_attach_driver call and instead placed it in the
> > __device_attach_async_helper call. This was motivated by the fact that the
> > only other caller of this, __device_attach, had already taken the
> > device_lock() and checked for dev->driver. Instead of testing for this
> > twice in this path it makes more sense to just consolidate the dev->dead
> > and dev->driver checks together into one set of checks.
> >
> > Reviewed-by: Dan Williams <dan.j.williams@...el.com>
> > Signed-off-by: Alexander Duyck <alexander.h.duyck@...ux.intel.com>
> 
> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

It's too late for 4.21-rc1 as my tree should be closed by now.

So I'll hold on to these in my queue until 4.21-rc1 is out and then
queue them up and see what breaks in linux-next :)

thanks,

greg k-h