linux-kernel - Re: [PATCH 2/2] ACPI / scan: Avoid enumerating devices more than once

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Message-ID: <20170418102159.GC3093@lahna.fi.intel.com>
Date:   Tue, 18 Apr 2017 13:21:59 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux ACPI <linux-acpi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH 2/2] ACPI / scan: Avoid enumerating devices more than once

On Mon, Apr 17, 2017 at 01:20:48AM +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> acpi_bus_attach() does not check the visited flag for devices that
> have been enumerated already and some of them may be enumerated
> for multiple times as a result, because some callers of
> acpi_bus_scan() don't check the visited flag either.
> 
> For this reason, modify acpi_bus_attach() to check the visited flag
> and avoid enumerating devices that have already been enumerated.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>