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

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Date:	Wed, 17 Jun 2009 13:45:18 -0300
From:	Herton Ronaldo Krzesinski <herton@...driva.com.br>
To:	Ian Abbott <abbotti@....co.uk>
Cc:	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

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

--
[]'s
Herton
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