linux-kernel - Re: [PATCH] ACPI/PNP: add two IDs to list for PNPACPI device enumeration

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Date:	Mon, 04 May 2015 16:33:01 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Witold Szczeponik <Witold.Szczeponik@....net>
Cc:	lenb@...nel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI/PNP: add two IDs to list for PNPACPI device enumeration

On Friday, May 01, 2015 07:05:20 PM Witold Szczeponik wrote:
> Commit eec15edbb0e14485998635ea7c62e30911b465f0 ("ACPI / PNP: use
> device ID list for PNPACPI device enumeration") changed the way how
> ACPI devices are enumerated and when they are added to the PNP bus.
> 
> However, it broke the sound card support on (at least) a vintage
> IBM ThinkPad 600E: with said commit applied, two of the necessary
> "CSC01xx" devices are not added to the PNP bus and hence can not be
> found during the initialization of the "snd-cs4236" module.  As a
> consequence, loading "snd-cs4236" causes null pointer exceptions.
> The attached patch fixes the problem end re-enables sound on the
> IBM ThinkPad 600E.
> 
> The patch is applied against Linux 4.0.x.

Queued up as a fix for 4.1, thanks!

But your e-mail client mangles whitespace.

> NB: A quick way to see if existing devices are missing from the
> PNP bus, the following script can be used to list candidates IDs.
> 
> hids="/sys/bus/acpi/devices/*/hid"
> for hid in $(grep -v -h -E -e "^(LNX|PNP|ACPI)" $hids | sort -u)
> do
>         grep -q \"$hid\" drivers/acpi/acpi_pnp.c || echo $hid
> done
> 
> Signed-off-by: Witold Szczeponik <Witold.Szczeponik@....net>
> 
> 
> diff --git a/drivers/acpi/acpi_pnp.c b/drivers/acpi/acpi_pnp.c
> index b193f84..ff6d8ad 100644
> --- a/drivers/acpi/acpi_pnp.c
> +++ b/drivers/acpi/acpi_pnp.c
> @@ -304,6 +304,8 @@ static const struct acpi_device_id acpi_pnp_device_ids[] = {
>         {"PNPb006"},
>         /* cs423x-pnpbios */
>         {"CSC0100"},
> +       {"CSC0103"},
> +       {"CSC0110"},
>         {"CSC0000"},
>         {"GIM0100"},            /* Guillemot Turtlebeach something appears to be cs4232 compatible */
>         /* es18xx-pnpbios */
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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