linux-kernel - Re: [3.8-rc4 arm] SCSI_SYM53C8XX

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Date:	Sat, 26 Jan 2013 17:17:07 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	linus.walleij@...aro.org
Cc:	rob.herring@...xeda.com, grant.likely@...retlab.ca,
	rmk+kernel@....linux.org.uk, linux-kernel@...r.kernel.org
Subject: Re: [3.8-rc4 arm] SCSI_SYM53C8XX_2 module cannot register IRQ

Tetsuo Handa wrote:
> > I'm sorry if this is a bit complicated but bisection down several
> > regressions is one of the more advanced forms of regression
> > bug hunt... You're quite cool if you can handle it :-)
> 
> Sorry, I'm a beginner about git. I already know that 07c9249f is the cause of
> "no console messages" and 5c49985c is the fix for "no console messages".
> How can I setup a snapshot with 07c9249f and 5c49985c applied (I tried
> 
>   $ git reset --hard 07c9249f
>   $ git format-patch --stdout 5c49985c^..5c49985c | patch -p1
> 
> but patch does not apply cleanly) so that I can find the commit causing
> "sym0: request irq 27 failure" which is between 07c9249f and 5c49985c?

I did a blind git bisection (i.e. starting

  $ qemu-system-arm -M versatilepb -hda hda.img -kernel arch/arm/boot/zImage -append "root=/dev/sda1 init=/bin/sh" -nographic

and watching "top" for %CPU usage of qemu-system-arm , assuming that it goes to
100% only if detection of block device for / partition failed and kernel called
panic(), goes to 0% otherwise) in two patterns.

  $ git bisect start HEAD b1112249 v3.7 v3.6 v3.5 v3.4 v3.3 v3.2 v3.1 v3.0 -- arch/arm drivers/scsi/sym53c8xx_2/ drivers/scsi/*.[ch]

  $ git bisect start v3.8-rc1 95e629b7 b8db6b8 810883f0 b10bca0b 14318efb 414a6750e b1112249 v3.7 v3.6 v3.5 v3.4 v3.3 v3.2 v3.1 v3.0

Both patterns resulted in that commit 07c9249f
"ARM: 7554/1: VIC: use irq_domain_add_simple()" is the cause of

  PCI: enabling device 0000:00:0c.0 (0100 -> 0103)
  sym0: <895a> rev 0x0 at pci 0000:00:0c.0 irq 27
  sym0: No NVRAM, ID 7, Fast-40, LVD, parity checking
  sym0: request irq 27 failure
  sym0: giving up ...

message.

Would you have a look?

Regards.
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