linux-kernel - Re: [PATCH v2 2/3] iommufd/device: Make hwpt_list list

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Message-ID: <Y9Y89ZQGNLwuyHc9@Asurada-Nvidia>
Date:   Sun, 29 Jan 2023 01:31:33 -0800
From:   Nicolin Chen <nicolinc@...dia.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
CC:     "jgg@...dia.com" <jgg@...dia.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] iommufd/device: Make hwpt_list list_add/del
 symmetric

On Sun, Jan 29, 2023 at 09:24:38AM +0000, Tian, Kevin wrote:
> External email: Use caution opening links or attachments
> 
> 
> > From: Nicolin Chen <nicolinc@...dia.com>
> > Sent: Sunday, January 29, 2023 5:18 AM
> >
> > Since the list_del() of hwpt_item is done in iommufd_device_detach(), move
> > its list_add_tail() to a similar place in iommufd_device_do_attach().
> 
> It's clearer to say that because list_del() is together with
> iopt_table_remove_domain() then it makes sense to have list_add_tail()
> together with iopt_table_add_domain().

OK. Will change that.

> >
> > Also move and place the mutex outside the
> > iommufd_device_auto_get_domain()
> > and iommufd_device_do_attach() calls, to serialize attach/detach routines.
> > This adds an additional locking protection so that the following patch can
> > safely remove devices_lock.
> >
> > Co-developed-by: Yi Liu <yi.l.liu@...el.com>
> > Signed-off-by: Yi Liu <yi.l.liu@...el.com>
> > Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> 
> Reviewed-by: Kevin Tian <kevin.tian@...el.com>

And add this too. Thanks!

Nicolin