Date:	Mon, 16 Apr 2007 19:43:03 -0700
From:	Mike Mattie <codermattie@...il.com>
To:	Adrian Bunk <bunk@...sta.de>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] 2.6.21-rc7 hpt366 driver broken

On Mon, 16 Apr 2007 18:21:12 -0700
Mike Mattie <codermattie@...il.com> wrote:

> On Mon, 16 Apr 2007 16:36:13 +0200
> Adrian Bunk <bunk@...sta.de> wrote:
> 
> > [ Cc's added, full bug report was in
> > http://lkml.org/lkml/2007/4/16/18 ]
> > 
> > On Mon, Apr 16, 2007 at 04:38:22AM -0700, Mike Mattie wrote:
> > > On Sun, 15 Apr 2007 22:48:46 -0700
> > > Mike Mattie <codermattie@...il.com> wrote:
> > > 
> > > > Hello,
> > > > 
> > > > I am testing the 2.6.21-rc7 kernel release. The IDE hpt366
> > > > driver is crashing hanging the boot. I have basically the same
> > > > config as 2.6.20.7 which works fine (except for netconsole
> > > > mentioned in a previous mail).
> > > > 
> > > > here is the hand-copied info:
> > > > 
> > > > * "unable to handle paging request" , null deref
> > > > * EIP @ init_chipset_hpt366
> > > > 
> > > 
> > > > I am running a git-bisect to see if I can resolve it to a
> > > > commit.
> > > 
> > > This was identified as the first broken commit:
> > > 
> > > commit 7b73ee05d0acb926923d43d78b61add776ea4bb1
> > > Author: Sergei Shtylyov <sshtylyov@...mvista.com>
> > > Date:   Wed Feb 7 18:18:16 2007 +0100
> > > 
> > >     hpt366: init code rewrite
> > > 
> > > Reverting is conflicted so it will be a bit longer before I
> > > pin-point any other build-breaks.
> > 
> > Thanks for your report.
> > 
> > Can you use a digital camera for taking a photograph of the crash?
> 
> I can later on tonight, by about 11PM west coast. I also saw
> some hex offsets after the function pointed to by EIP, is there
> a way to decode that to a line number ? I have debugging symbols
> enabled.
> 
> I am also doing printk breadcrumbs to pin it down to a block
> or a line.

I have narrowed the crash with breadcrumbs down to these lines:


	/*
	 * Only try the DPLL if we don't have a table for the PCI clock that
	 * we are running at for HPT370/A, always use it  for anything newer...
	 *
	 * NOTE: Using the internal DPLL results in slow reads on 33 MHz PCI.
	 * We also  don't like using  the DPLL because this causes glitches
	 * on PRST-/SRST- when the state engine gets reset...
	 */
	if (info->chip_type >= HPT374 || info->settings[clock] == NULL) {
		u16 f_low, delta = pci_clk < 50 ? 2 : 4;
		int adjust;

		printk(KERN_INFO "inside the if\n");

		 /*
		  * Select 66 MHz DPLL clock only if UltraATA/133 mode is
		  * supported/enabled, use 50 MHz DPLL clock otherwise...
		  */
		if (info->max_mode == 0x04) {
			dpll_clk = 66;
			clock = ATA_CLOCK_66MHZ;
		} else if (dpll_clk) {	/* HPT36x chips don't have DPLL */
			dpll_clk = 50;
			clock = ATA_CLOCK_50MHZ;
		}

		if (info->settings[clock] == NULL) {
			printk(KERN_ERR "%s: unknown bus timing!\n", name);
			kfree(info);
			return -EIO;
		}

		printk(KERN_INFO "select DPLL clock\n");

This is right around 1171 , (skewed by the crumbs I added). The last
message I receive is "inside if" , it dies before "select DPLL clock".

Without knowing much about the structs I am not sure what to print-out.
I will narrow it further, and maybe even compare against what the old
working kernel had for variable values. That would take some time though.

> 
> > cu
> > Adrian
> > 
> > --
> > 
> >        "Is there not promise of rain?" Ling Tan asked suddenly out
> >         of the darkness. There had been need of rain for many days.
> >        "Only a promise," Lao Er said.
> >                                        Pearl S. Buck - Dragon Seed
> > 

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