linux-kernel - Re: [BUG] acpica: ltp_acpi test case causes kernel crash at acpi_ns_walk

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Message-ID: <9523980.S2jPabPoO5@aspire.rjw.lan>
Date:   Wed, 13 Dec 2017 00:45:50 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Vadim Lomovtsev <Vadim.Lomovtsev@...iumnetworks.com>
Cc:     robert.moore@...el.com, lv.zheng@...el.com,
        rafael.j.wysocki@...el.com, lenb@...nel.org,
        linux-acpi@...r.kernel.org, devel@...ica.org,
        linux-kernel@...r.kernel.org, vadim.lomovtsev@...ium.com
Subject: Re: [BUG] acpica: ltp_acpi test case causes kernel crash at acpi_ns_walk_namespace

On Tuesday, December 12, 2017 4:59:19 PM CET Vadim Lomovtsev wrote:
> Hi guys,
> 
> While running LTP tests I've faced kernel crash caused by ltp_acpi test case.
> I have ACPI support enabled in kernel but kernel is boot with FDT having ACPI
> disabled. The ltp_acpi test case application is built along with ltp_acpi_cmds
> module to run ACPI tests.
> 
> So my question is - should we update acpica implementation at kernel side by
> adding 'acpi_disabled' variable checking to the 'acpi_get_devices' function (see
> patch next to this email, maybe not a good approach) or this should be fixed at LTP
> side so the ltp_acpi_cmds should be updated in order to check if acpi is enabled
> before running tests ?

There should be a check preventing acpi_get_devices() from being called in the
acpi_disabled case.

acpi_disabled is Linux-specific and the ACPICA code isn't, so the code calling
ACPICA functions should check acpi_disabled when necessary.

Thanks,
Rafael