linux-kernel - Re: Udev coldplugging loads 8139too driver instead of 8139cp

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Message-Id: <20080129181903.A8AE618712F0@smtp03.mtu.ru>
Date:	Tue, 29 Jan 2008 21:18:59 +0300
From:	Andrey Borzenkov <arvidjaar@...l.ru>
To:	Ondrej Zary <linux@...nbow-software.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Udev coldplugging loads 8139too driver instead of 8139cp

Ondrej Zary wrote:

> On Tuesday 29 January 2008 11:43:53 Michael Tokarev wrote:
>> Stephen Hemminger wrote:
>> > On Tue, 29 Jan 2008 03:46:08 +0300
>> > Michael Tokarev <mjt@....msk.ru> wrote:
>>
>> []
>>
>> >> There are 2 drivers for 8139-based NICs.  For really different two
>> >> kinds
>> >> of hardware, which both uses the same PCI identifiers.  Both drivers
>> >> "claims" to work with all NICs with those PCI ids, because
>> >> "externally" (by means of udev for example) it's impossible to
>> >> distinguish the two kinds of hardware, it becomes clean only when the
>> >> driver (either of the two) loads and actually checks which hardware we
>> >> have here.
>> >
>> > Is there any chance of using subdevice or subversion to tell them
>> > apart? That worked for other vendors like DLINK who slapped same ID on
>> > different cards.
>>
>> If it were that simple... ;)
>>
>> No.  The difference is in PCI revision number (byte #8 in PCI config
>> space). If it's >= 0x40 - it's 8139too, < 0x40 - 8139cp.  Or 0x20 - I
>> forgot.
> 
> Perhaps a module could be created that will claim this device ID and then
> use the correct driver.
> 

C'mon, really ...

echo 'alias ...v000010ECd00008139... 8139too' >> /etc/modprobe.conf


>> Here's a code snippet from a shell script I used ages ago to
>> automatically load modules (similar to what udev does nowadays):
>>
>>   # special hack for 8139{too,cp} stuff
>>   case "$modalias" in
>>   *v000010ECd00008139*)
>>     rev="$(dd if="$1/config" bs=1 skip=8 count=1 2>/dev/null)"
>>     if [ -n "$rev" ]; then
>>       list=
>>       for module in $modlist; do
>>         case "$module" in
>>         8139cp)
>>           if [ ".$rev" \< ". " ]; then
>>             $vecho1 "$TAG: not loading $module for this device"
>>             continue
>>           fi
>>           ;;
>>         8139too)
>>           if [ ".$rev" \> ". " ]; then
>>             $vecho1 "$TAG: not loading $module for this device"
>>             continue
>>           fi
>>           ;;
>>         esac
>>         list="$list $module"
>>       done
>>       modlist="$list"
>>     fi
>>     ;;
>>   esac
>>
>> /mjt
>> --
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> 
> 
> 


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