linux-kernel - Re: [PATCH v3] hisi_lpc: Use acpi_dev_for_each

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Date:   Fri, 1 Jul 2022 20:19:18 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     John Garry <john.garry@...wei.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yang Yingliang <yangyingliang@...wei.com>
Subject: Re: [PATCH v3] hisi_lpc: Use acpi_dev_for_each_child()

On Fri, Jul 1, 2022 at 12:49 PM John Garry <john.garry@...wei.com> wrote:
>
> On 30/06/2022 19:13, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > Subject: [PATCH] hisi_lpc: Use acpi_dev_for_each_child()
> >
> > Instead of walking the list of children of an ACPI device directly,
> > use acpi_dev_for_each_child() to carry out an action for all of
> > the given ACPI device's children.
> >
> > This will help to eliminate the children list head from struct
> > acpi_device as it is redundant and it is used in questionable ways
> > in some places (in particular, locking is needed for walking the
> > list pointed to it safely, but it is often missing).
> >
> > While at it, simplify hisi_lpc_acpi_set_io_res() by making it accept
> > a struct acpi_device pointer from the caller, instead of going to
> > struct device and back to get the same result, and clean up confusion
> > regarding hostdev and its ACPI companion in that function.
> >
> > Also remove a redundant check from it.
> >
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> This change itself looks fine and I quickly tested, so:
> Reviewed-by: John Garry <john.garry@...wei.com>
>
> However Yang Yingliang spotted a pre-existing bug in the ACPI probe and
> sent a fix today (coincidence?):
>
> https://lore.kernel.org/lkml/20220701094352.2104998-1-yangyingliang@huawei.com/T/#u
>
> And they conflict. This code has been this way for years, so I just
> suggest Yang Yingliang resends the fix on top off Rafael's change.

Well, as I've just said, I can apply both patches just fine.