Date:	Fri, 25 May 2007 15:59:49 +0200
From:	Uwe Bugla <uwe.bugla@....de>
To:	Michael Buesch <mb@...sch.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
	"John W. Linville" <linville@...driver.com>
Subject: Re: BUG in 2.6.22-rc2-mm1: NIC module b44.c broken (Broadcom 4400)

Am Freitag, 25. Mai 2007 15:12 schrieben Sie:
> On Thursday 24 May 2007 22:06:59 Andrew Morton wrote:
> > On Thu, 24 May 2007 21:56:16 +0200
> >
> > "Uwe Bugla" <uwe.bugla@....de> wrote:
> > > Hi everybody,
> >
> > (added linux-wireless, others)
> >
> > > The patch against b44.c contained in 2.6.22-rc2-mm1 has two
> > > consequences:
> > >
> > > 1. a tight binding to module ssb whose function or necessity I neither
> > > see through nor do comprehend
> > >
> > > 2. a breakdown (disfunctionality) of my onboard NIC.
> > >
> > > lspci -v looks like this:
> > >
> > > 00:00.0 Host bridge: Intel Corporation 82845G/GL[Brookdale-G]/GE/PE
> > > DRAM Controller/Host-Hub Interface (rev 02) Subsystem: ASUSTeK Computer
> > > Inc. Unknown device 80b2
> > > 	Flags: bus master, fast devsel, latency 0
> > > 	Memory at f8000000 (32-bit, prefetchable) [size=64M]
> > > 	Capabilities: [e4] Vendor Specific Information
> > > 	Capabilities: [a0] AGP version 2.0
> > >
> > > 00:01.0 PCI bridge: Intel Corporation 82845G/GL[Brookdale-G]/GE/PE
> > > Host-to-AGP Bridge (rev 02) (prog-if 00 [Normal decode]) Flags: bus
> > > master, 66MHz, fast devsel, latency 64
> > > 	Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
> > > 	I/O behind bridge: 0000d000-0000dfff
> > > 	Memory behind bridge: f2000000-f27fffff
> > > 	Prefetchable memory behind bridge: f3f00000-f7ffffff
> > >
> > > 00:1d.0 USB Controller: Intel Corporation 82801DB/DBL/DBM
> > > (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 02) (prog-if 00
> > > [UHCI]) Subsystem: ASUSTeK Computer Inc. Unknown device 8089
> > > 	Flags: bus master, medium devsel, latency 0, IRQ 17
> > > 	I/O ports at b800 [size=32]
> > >
> > > 00:1d.1 USB Controller: Intel Corporation 82801DB/DBL/DBM
> > > (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 02) (prog-if 00
> > > [UHCI]) Subsystem: ASUSTeK Computer Inc. Unknown device 8089
> > > 	Flags: bus master, medium devsel, latency 0, IRQ 20
> > > 	I/O ports at b400 [size=32]
> > >
> > > 00:1d.2 USB Controller: Intel Corporation 82801DB/DBL/DBM
> > > (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 02) (prog-if 00
> > > [UHCI]) Subsystem: ASUSTeK Computer Inc. Unknown device 8089
> > > 	Flags: bus master, medium devsel, latency 0, IRQ 16
> > > 	I/O ports at b000 [size=32]
> > >
> > > 00:1d.7 USB Controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M)
> > > USB2 EHCI Controller (rev 02) (prog-if 20 [EHCI]) Subsystem: ASUSTeK
> > > Computer Inc. Unknown device 8089
> > > 	Flags: bus master, medium devsel, latency 0, IRQ 18
> > > 	Memory at f1800000 (32-bit, non-prefetchable) [size=1K]
> > > 	Capabilities: [50] Power Management version 2
> > > 	Capabilities: [58] Debug port
> > >
> > > 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 82)
> > > (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0
> > > 	Bus: primary=00, secondary=02, subordinate=02, sec-latency=32
> > > 	Memory behind bridge: f1000000-f17fffff
> > > 	Prefetchable memory behind bridge: f2800000-f3efffff
> > >
> > > 00:1f.0 ISA bridge: Intel Corporation 82801DB/DBL (ICH4/ICH4-L) LPC
> > > Interface Bridge (rev 02) Flags: bus master, medium devsel, latency 0
> > >
> > > 00:1f.1 IDE interface: Intel Corporation 82801DB (ICH4) IDE Controller
> > > (rev 02) (prog-if 8a [Master SecP PriP]) Subsystem: ASUSTeK Computer
> > > Inc. Unknown device 8089
> > > 	Flags: bus master, medium devsel, latency 0, IRQ 16
> > > 	I/O ports at 01f0 [size=8]
> > > 	I/O ports at 03f4 [size=1]
> > > 	I/O ports at 0170 [size=8]
> > > 	I/O ports at 0374 [size=1]
> > > 	I/O ports at f000 [size=16]
> > > 	Memory at 30000000 (32-bit, non-prefetchable) [size=1K]
> > >
> > > 00:1f.3 SMBus: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M)
> > > SMBus Controller (rev 02) Subsystem: ASUSTeK Computer Inc. Unknown
> > > device 8089
> > > 	Flags: medium devsel, IRQ 19
> > > 	I/O ports at e800 [size=32]
> > >
> > > 00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM
> > > (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 02) Subsystem: ASUSTeK
> > > Computer Inc. Unknown device 80b0
> > > 	Flags: bus master, medium devsel, latency 0, IRQ 19
> > > 	I/O ports at a800 [size=256]
> > > 	I/O ports at a400 [size=64]
> > > 	Memory at f0800000 (32-bit, non-prefetchable) [size=512]
> > > 	Memory at f0000000 (32-bit, non-prefetchable) [size=256]
> > > 	Capabilities: [50] Power Management version 2
> > >
> > > 01:00.0 VGA compatible controller: ATI Technologies Inc Rage 128 PF/PRO
> > > AGP 4x TMDS (prog-if 00 [VGA]) Subsystem: ATI Technologies Inc Rage
> > > Fury Pro/Xpert 2000 Pro
> > > 	Flags: bus master, stepping, 66MHz, medium devsel, latency 64, IRQ 17
> > > 	Memory at f4000000 (32-bit, prefetchable) [size=64M]
> > > 	I/O ports at d800 [size=256]
> > > 	Memory at f2000000 (32-bit, non-prefetchable) [size=16K]
> > > 	Expansion ROM at f3fe0000 [disabled] [size=128K]
> > > 	Capabilities: [50] AGP version 2.0
> > > 	Capabilities: [5c] Power Management version 2
> > >
> > > 02:05.0 Ethernet controller: Broadcom Corporation BCM4401 100Base-T
> > > (rev 01) Subsystem: ASUSTeK Computer Inc. A7V8X motherboard
> > > 	Flags: bus master, fast devsel, latency 32, IRQ 255
> > > 	Memory at f1000000 (32-bit, non-prefetchable) [disabled] [size=8K]
> > > 	Capabilities: [40] Power Management version 2
> > >
> > > 02:0b.0 Multimedia video controller: Brooktree Corporation Bt878 Video
> > > Capture (rev 11) Subsystem: Pinnacle Systems Inc. PCTV Sat (DBC
> > > receiver)
> > > 	Flags: bus master, medium devsel, latency 32, IRQ 18
> > > 	Memory at f3000000 (32-bit, prefetchable) [size=4K]
> > > 	Capabilities: [44] Vital Product Data
> > > 	Capabilities: [4c] Power Management version 2
> > >
> > > 02:0b.1 Multimedia controller: Brooktree Corporation Bt878 Audio
> > > Capture (rev 11) Subsystem: Pinnacle Systems Inc. PCTV Sat (DBC
> > > receiver)
> > > 	Flags: bus master, medium devsel, latency 32, IRQ 18
> > > 	Memory at f2800000 (32-bit, prefetchable) [size=4K]
> > > 	Capabilities: [44] Vital Product Data
> > > 	Capabilities: [4c] Power Management version 2
> > >
> > > Please note:
> > >
> > > 1. IRQ 255 looks very idiotic, doesn't it? It does not exist at all,
> > > does it?
> > >
> > > Questions:
> > >
> > > 1. What is the technical need / progress of module ssb please?
> > >
> > > 2. If Andrew Morton's guidelines clearly say: "Do test your patches on
> > > three different machines" and this guideline seems to be strictly
> > > ignored by some sparetime hackers:
> > >
> > > What is the master plan then to avoid the fact that such a crap is
> > > being sent in to Andrew?
> > >
> > > Yours sincerely
> > >
> > > Uwe
> > >
> > > P. S.: There is an important saying going like this:
> > >
> > > Too many cooks do mess up the pap.
> > >
> > > Regarding the patch in mm-tree I can see SIX (!) Copyright owners.
> > > The last one of them (i. e. the one of 2007) obviuosly does not seem to
> > > understand what he is doing (see that nonsense interrupt please, just
> > > incredible!) :(
> > >
> > > In so far I would deeply appreciate Andrew Morton to throw that b44.c
> > > patch into the trashbox as soon as possible :)
> >
> > The code presumably worked for the developer.  The reason for merging it
> > into -mm is to allow others to identify problems such as these before the
> > code hits mainline.
> >
> > Having bugs in -mm is normal, natural and expected.  What I _do_ very
> > much prefer to see is that these bugs get fixed promptly and, critically,
> > that the code doesn't go into Linus's tree until all the known bugs are
> > repaired.
> >
> > Also, it's really bad when a bug makes the entire -mm release unusable
> > for testers.  Because this means that all the _other_ people who have
> > code being tested in -mm just lost a tester.  And it can cause people to
> > just not bother testing -mm kernels at all, which means that more badness
> > will get into mainline.
>
> You are talking a _lot_ of bullshit, and I'd really like to tell
> you to fuck off, because you have no clue how software development works.
>
> But I (as the primary developer of ssb) like to resolve the issue, too.

Well if you're so clever in software development then please provide an 
exception handling for the ssb module which is specifically NOT needed by my 
onboard controller, OK?
Just provide compatibility to non-wireless NICs, i. e. to non-ssb devices.

I think you cannot just bind ssb tightly to b44.c, can you?
In so far the way how ssb is attached is buggy and wrong, apart from the fact 
that my controller is broken, disfunctional.

That's how I understand Andrew Morton's guideline: "Test your patches on three 
different machines before sending them in."
In so far I do expect that you at least take the effort of testing your stuff 
with a PCI NIC or onboard NIC of the BCM4401 class of NICs before you send 
your stuff in.

Now see, if everybody would ignore Andrew's guidelines the mm-tree qwould be 
nothing like an unusable chaos, wouldn't it.

In so far you just cannot delegate the testing to other people before you are 
sending in that stuff.
That's what Andrew tried to explain to you.

I am convinced that your solution runs on your machine, but the solution that 
you provide looks very rude, doesn't it?

> Please provide more information on the actual _issue_.

Sure, no problem:

02:05.0 Ethernet controller: Broadcom Corporation BCM4401 100Base-T (rev 01)
        Subsystem: ASUSTeK Computer Inc. A7V8X motherboard
        Flags: bus master, fast devsel, latency 32, IRQ 17
        Memory at f1000000 (32-bit, non-prefetchable) [size=8K]
        Capabilities: <access denied>

>
> In this whole mail you basically only state that:
> > IRQ 255 looks very idiotic, doesn't it?
>
> Explain that in detail, please. Why do you think it's wrong?

The "traditional" IRQ table provides TWO cascaded blocks of 8 interrupt 
numbers.
Gives a spectrum from 0 to 15, doesn't it?

The ACPI system enlarges that, and on at least my system the highest interrupt 
number is 21. Now if there were some more cards installed the maximum number 
would perhaps amount to 25.

In so far an IRQ value of 255 looks a bit very very strange, doesn't it?

> Which IRQ number do you get with the old b44 driver?

IRQ 17

>
> Thanks for your testing. That is why -mm exists.
> Next time without bullshitting, please.

Cheers

Uwe
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