linux-kernel - Re: staging driver s626 clashes with philips SAA7146 media/dvb based cards

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Message-ID: <4A39343C.7030908@mev.co.uk>
Date:	Wed, 17 Jun 2009 19:21:48 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	Herton Ronaldo Krzesinski <herton@...driva.com.br>
CC:	Ian Abbott <ian.abbott@....co.uk>, Greg KH <gregkh@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Gianluca Palli <gpalli@...s.unibo.it>,
	David Schleef <ds@...leef.org>,
	Frank Mori Hess <fmhess@...rs.sourceforge.net>
Subject: Re: staging driver s626 clashes with philips SAA7146 media/dvb based
 cards

Herton Ronaldo Krzesinski wrote:
> Em Quarta-feira 17 Junho 2009, às 09:26:00, Ian Abbott escreveu:
>> Herton Ronaldo Krzesinski wrote:
>>> Em Terça-feira 16 Junho 2009, às 17:51:21, Greg KH escreveu:
>>>> On Tue, Jun 16, 2009 at 05:01:44PM -0300, Herton Ronaldo Krzesinski wrote:
>>>>> Hi,
>>>>>
>>>>> The s626 (comedi) driver in staging conflicts with philips SAA7146
>>>>> media/dvb based cards, because it claims the same vendor:device pci id
>>>>> for all subdevice/subvendor ids. What happens is that for people that
>>>>> have a philips SAA7146 based card, s626 if available gets loaded by udev
>>>>> and makes system freeze (https://qa.mandriva.com/show_bug.cgi?id=51445).
>>>> So a PCI device that does different things has the same device ids?
>>>> ick, stupid vendors...
>>>>
>>>>> Looks like s626 shouldn't claim all 1131:7146 devices, either by
>>>>> specifying specific subdevice/subvendor ids specific to s626 devices or
>>>>> doing additional checks in its probe/attach function.
>>>> If you can propose the proper sub ids, or the needed checks, please send
>>>> a patch.
>>> Can't propose proper sub ids here etc., as I don't know about/don't have s626
>>> device, s626 author is CC'ed here to check this. But I could send a patch to
>>> disable just the build of s626 if acceptable/desired for the moment.
>> The Windows driver (<http://www.sensoray.com/downloads/sdk626.zip>) has
>> this in the models section of the INF file:
>>
>> %sx26.DeviceDesc%=sxdrv.Device,PCI\VEN_1131&DEV_7146&SUBSYS_02726000
>>
>> And it looks like the correct device because this the strings section
>> contains:
>>
>> sx26.DeviceDesc=   "Sensoray Model 626 Analog/Digital I/O"
>>
>> Interpreting the above information gives us:
>>
>> PCI Vendor ID = 0x1131
>> PCI Device ID = 0x7146
>> PCI Subvendor ID = 0x6000
>> PCI Subdevice ID = 0x0272 (626)
>>
>> The Linux SDK for this board
>> (<http://www.sensoray.com/downloads/s626-1.0.1.tar.gz> has the same info
>> in the s626core.h file.
>
> Ok thanks. So lets limit s626 by its subvendor:subdevice id, patch follows:
>
> From 6f4d2430959a378ab754c5dbd3903fdcf33abe36 Mon Sep 17 00:00:00 2001
> From: Herton Ronaldo Krzesinski <herton@...driva.com.br>
> Date: Wed, 17 Jun 2009 13:31:15 -0300
> Subject: [PATCH] Staging: comedi: use subvendor:subdevice ids for its pci id device table
>
> The current s626 comedi driver in staging conflicts with philips SAA7146
> media/dvb based cards, because it claims the same vendor:device pci id
> for all subdevice/subvendor ids. What happens is that for people that
> have a philips SAA7146 based card, s626 if available gets loaded by udev
> and makes system freeze (https://qa.mandriva.com/show_bug.cgi?id=51445).
>
> The s626 driver shouldn't claim all 1131:7146 devices. Fix this by
> specifying specific known subvendor:subdevice ids in its pci id table
> list.
>
> Reference: http://lkml.org/lkml/2009/6/16/552
>
> Signed-off-by: Herton Ronaldo Krzesinski <herton@...driva.com.br>
> ---
>  drivers/staging/comedi/drivers/s626.c |    8 ++++++--
>  1 files changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/comedi/drivers/s626.c b/drivers/staging/comedi/drivers/s626.c
> index 30dec9d..b4b7713 100644
> --- a/drivers/staging/comedi/drivers/s626.c
> +++ b/drivers/staging/comedi/drivers/s626.c
> @@ -110,9 +110,13 @@ static const struct s626_board s626_boards[] = {
>  #define PCI_VENDOR_ID_S626 0x1131
>  #define PCI_DEVICE_ID_S626 0x7146
>
> +/*
> + * Note: always specify subvendor:subdevice ids in table below, to avoid
> + * clash with Philips SAA7146 media/dvb based cards which have same
> + * vendor:device ids as S626
> + */
>  static DEFINE_PCI_DEVICE_TABLE(s626_pci_table) = {
> -       {PCI_VENDOR_ID_S626, PCI_DEVICE_ID_S626, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
> -               0},
> +       {PCI_VENDOR_ID_S626, PCI_DEVICE_ID_S626, 0x6000, 0x0272, 0, 0, 0},
>         {0}
>  };
>
> --
> 1.6.3.2

There are also a couple of calls to pci_get_device() that need changing
to pci_get_subsys() in the s626_attach() function (so it also might be
worth #define'ing the subsys numbers to avoid repeating these magic
numbers).

--
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk>             )=-
-=( Tel: +44 (0)161 477 1898   FAX: +44 (0)161 718 3587              )=-


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