Date: Thu, 29 Nov 2007 17:45:57 +0100
From: Anders Henke <anders.henke@1und1.de>
To: FUJITA Tomonori <tomof@acm.org>
Cc: jack@ucw.cz, fujita.tomonori@lab.ntt.co.jp, linux-kernel@vger.kernel.org,
       linux-scsi@vger.kernel.org
Subject: Re: broken dpt_i2o in 2.6.23 (was: ext2_check_page: bad entry in directory) (fwd)
Message-ID: <20071129164557.GD30957@1und1.de>
References: <20071129130319.GA2642@atrey.karlin.mff.cuni.cz> <20071129235813Y.tomof@acm.org>
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On Nov 29 2007, FUJITA Tomonori wrote:
> On Thu, 29 Nov 2007 14:03:19 +0100
> Jan Kara <jack@ucw.cz> wrote:
> 
> >   Adding relevant people and lists to CC...
> > 
> > 									Honza
> > 
> > ----- Forwarded message from Anders Henke <anders.henke@1und1.de> -----
> > 
> > Date:	Thu, 29 Nov 2007 13:31:50 +0100
> > From: Anders Henke <anders.henke@1und1.de>
> > To: linux-kernel@vger.kernel.org
> > Subject: Re: broken dpt_i2o in 2.6.23 (was: ext2_check_page: bad entry in directory)
> > User-Agent: Mutt/1.5.13 (2006-08-11)
> > 
> > On November 28 2007, Anders Henke wrote:
> > > As "everything is reported as being zero" is quite odd an Jan took a
> > > guess that it might be block-layer or driver-related, I've assumed
> > > that the driver is responsible for this; just out of the curiousity, 
> > > I've manually replaced the dpt_i2o driver by the 2.6.19 one by copying 
> > > driver/scsi/dpt_i2o.c driver/scsi/dpti.h and driver/scsi/dpt/ into a 
> > > vanilla 2.6.23.1. kernel; using this kernel fixed the issue for me.
> > > 
> > > I haven't yet fine-tested from which kernel release on the dpt_i2o driver 
> > > behaves like this and spews out zeroed blocks when trying to mount
> > > the rootfs. Maybe this is just some timing issue.
> > 
> > I've started the fine-tests and can say so far that dpt_i2o from 
> > 2.6.22 is still fine. Test is simple:
> > 
> > anders@ista:/usr/src/linux-2.6.22/drivers/scsi/dpt$ cp -r dpt/ dpt_i2o.c dpti.h /usr/src/linux-2.6.23.1/drivers/scsi/
> > 
> > ... recompile the kernel, reboot: works.
> > 
> > 2.6.22 and 2.6.23 differ in terms of the dpt_i2o driver by two different
> > patch sets:
> > -one 2 Kb small set of patches from 2.6.22 to 2.6.22-rc1
> > -one 7 Kb set of patches from 2.6.23-rc2 to 2.6.23-rc3
> > -one 162 Kb set of patches from 2.6.23-rc9 to 2.6.23-rc10.
> > 
> > When applying the 2.6.23-rc1-based driver to "my" 2.6.31.1 kernel,
> > the "zero blocks"-symptom show up, so it's the "lucky" situation
> > that the smallest patch actually seams to be the broken one.
> > 
> > According to the 2.6.23-rc1 short-form changelog, there is
> > one major edit on the dpt_i2o driver:
> > 
> > FUJITA Tomonori 
> > 
> >       [SCSI] dpt_i2o: convert to use the data buffer accessors
> > 
> > Stephen Rothwell 
> >       dpt_i2o depends on virt_to_bus
> > 
> > Fujita, would you please take a look at this?
> 
> Sorry about the bug. Can you try this?
> 
> 
> diff --git a/drivers/scsi/dpt_i2o.c b/drivers/scsi/dpt_i2o.c
> index 8258506..1255b26 100644
> --- a/drivers/scsi/dpt_i2o.c
> +++ b/drivers/scsi/dpt_i2o.c
> @@ -3295,7 +3295,7 @@ static struct scsi_host_template adpt_template = {
>  	.this_id		= 7,
>  	.cmd_per_lun		= 1,
>  	.use_clustering		= ENABLE_CLUSTERING,
> -	.use_sg_chaining	= ENABLE_SG_CHAINING,
> +	.use_sg_chaining	= DISABLE_SG_CHAINING,
>  };
>  
>  static s32 adpt_scsi_register(adpt_hba* pHba)

The structure to patch does look different and doesn't include an
tag "use_sg_chaining":

---cut
static struct scsi_host_template adpt_template = {
        .name                   = "dpt_i2o",
        .proc_name              = "dpt_i2o",
        .proc_info              = adpt_proc_info,
        .info                   = adpt_info,
        .queuecommand           = adpt_queue,
        .eh_abort_handler       = adpt_abort,
        .eh_device_reset_handler = adpt_device_reset,
        .eh_bus_reset_handler   = adpt_bus_reset,
        .eh_host_reset_handler  = adpt_reset,
        .bios_param             = adpt_bios_param,
        .slave_configure        = adpt_slave_configure,
        .can_queue              = MAX_TO_IOP_MESSAGES,
        .this_id                = 7,
        .cmd_per_lun            = 1,
        .use_clustering         = ENABLE_CLUSTERING,
};

static s32 adpt_scsi_register(adpt_hba* pHba)
---cut


Anders
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