linux-kernel - [PATCH 0/2] ACPI: scan: Introduce a replacement for acpi_bus_get

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Date:   Fri, 03 Dec 2021 17:34:58 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux ACPI <linux-acpi@...r.kernel.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>
Subject: [PATCH 0/2] ACPI: scan: Introduce a replacement for acpi_bus_get_device()

Hi All,

Because acpi_bus_get_device() turned out to be problematic in the past, it has
been changed to the point that its calling convention doesn't make much sense
any more (ie. the pointer passed to it as the second argument is cleared on
errors and it can only return one error value if that pointer is nonzero, so
there is some duplication of information in there) and it has to make redundant
checks.

Moreover, its name suggests some kind of reference counting which really isn't
the case.

Thus patch [1/2] introduces a replacement for it, called acpi_fetch_acpi_dev(),
and makes the code in scan.c use it instead of acpi_bus_get_device() internally.

Patch [2/2] updates all of the callers of acpi_bus_get_device() within the ACPI
subsystem to use the replacement (which involves fixing a couple of bugs related
to that).

Thanks!