Date:	Mon, 11 Feb 2008 11:47:57 +0200
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Russell King <rmk+lkml@....linux.org.uk>,
	Adrian Bunk <adrian.bunk@...ial.fi>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: scsi/arm/fas216.c compile error

On Mon, Feb 11 2008 at 0:44 +0200, James Bottomley <James.Bottomley@...senPartnership.com> wrote:
> On Sun, 2008-02-10 at 22:02 +0000, Russell King wrote:
>> On Sun, Feb 10, 2008 at 08:20:24AM -0600, James Bottomley wrote:
>>> On Sun, 2008-02-10 at 13:58 +0000, Russell King wrote:
>>>> On Sun, Feb 10, 2008 at 03:07:09PM +0200, Boaz Harrosh wrote:
>>>>> It's in mainline 84ac86ca8c6787f9efff28bc04b1b65fe0a5c310
>>>>>   [SCSI] arm: convert to accessors and !use_sg cleanup
>>>>>
>>>>> Thanks for checking. This patch was in scsi-pending tree since forever, And we were unable
>>>>> to get a responsive maintainer to ACK on them. until the breakage cause went into mainline
>>>>> we finally managed a Tested-by:.
>>>>>
>>>>> I guess sometimes people are so busy, you need a bulldozer to shove 20 minutes into they're
>>>>> schedule.
>>>> Oh, I was ill for most of December, particularly at the time that you
>>>> sent the patch, and by the time I recovered, it was buried in my mailbox.
>>>>
>>>> Suggest you have some consideration for others who might not be able to
>>>> do your beg and call at the immediate moment that you want it, and
>>>> consider that their email management skills may not be as l33t as yours.
>>> OK, sorry about this, it's a bit of a cockup all around.  The patch that
>>> fixes this problem is still in SCSI pending largely because it's patch
>>> description:
>>>
>>>     [SCSI] fas216: Use scsi_eh API for REQUEST_SENSE invocation
>>>
>>> Doesn't lead one to think it might be build critical, so I concentrated
>>> on getting the other arm patch out.
>>>
>>> Russell, could you give it a quick test, and I'll put it in with a
>>> tested-by tag?
>> It's not looking good:
>>
>>   CC      drivers/scsi/arm/fas216.o
>> drivers/scsi/arm/fas216.c: In function `fas216_rq_sns_done':
>> drivers/scsi/arm/fas216.c:2021: warning: passing arg 2 of `scsi_eh_restore_cmnd' from incompatible pointer type
>> drivers/scsi/arm/fas216.c: In function `fas216_std_done':
>> drivers/scsi/arm/fas216.c:2107: warning: passing arg 2 of `scsi_eh_prep_cmnd' from incompatible pointer type
>>
>> Since the second argument of scsi_eh_prep_cmnd is 'struct scsi_eh_save *ses'
>> this patch is most definitely bad.  Not even booted it.
> 
> Yes, there looks to be a fatal screw up in the definition in
> FAS216_Info.  Could you try this ... I think I've corrected it.
> 
> James
> 
> ---
> 
>>>From 35be7297dc581b42c05ea7751ee595b0ce78f669 Mon Sep 17 00:00:00 2001
> From: Boaz Harrosh <bharrosh@...asas.com>
> Date: Mon, 10 Sep 2007 22:39:11 +0300
> Subject: [SCSI] fas216: Use scsi_eh API for REQUEST_SENSE invocation
> 
>   - Use new scsi_eh_prep/restor_cmnd() for synchronous
>     REQUEST_SENSE invocation.
> 
> Signed-off-by: Boaz Harrosh <bharrosh@...asas.com>
> Cc: Russell King <rmk@....linux.org.uk>
> Signed-off-by: James Bottomley <James.Bottomley@...senPartnership.com>
> ---
>  drivers/scsi/arm/fas216.c |   16 +++-------------
>  drivers/scsi/arm/fas216.h |    3 +++
>  2 files changed, 6 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/scsi/arm/fas216.c b/drivers/scsi/arm/fas216.c
> index fb5f202..a715632 100644
> --- a/drivers/scsi/arm/fas216.c
> +++ b/drivers/scsi/arm/fas216.c
> @@ -2018,6 +2018,7 @@ static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
>  	 * the upper layers to process.  This would have been set
>  	 * correctly by fas216_std_done.
>  	 */
> +	scsi_eh_restore_cmnd(SCpnt, &info->ses);
>  	SCpnt->scsi_done(SCpnt);
>  }
>  
> @@ -2103,23 +2104,12 @@ request_sense:
>  	if (SCpnt->cmnd[0] == REQUEST_SENSE)
>  		goto done;
>  
> +	scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0);
>  	fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
>  			  "requesting sense");
> -	memset(SCpnt->cmnd, 0, sizeof (SCpnt->cmnd));
> -	SCpnt->cmnd[0] = REQUEST_SENSE;
> -	SCpnt->cmnd[1] = SCpnt->device->lun << 5;
> -	SCpnt->cmnd[4] = sizeof(SCpnt->sense_buffer);
> -	SCpnt->cmd_len = COMMAND_SIZE(SCpnt->cmnd[0]);
> -	SCpnt->SCp.buffer = NULL;
> -	SCpnt->SCp.buffers_residual = 0;
> -	SCpnt->SCp.ptr = (char *)SCpnt->sense_buffer;
> -	SCpnt->SCp.this_residual = sizeof(SCpnt->sense_buffer);
> -	SCpnt->SCp.phase = sizeof(SCpnt->sense_buffer);
> +	init_SCp(SCpnt);
>  	SCpnt->SCp.Message = 0;
>  	SCpnt->SCp.Status = 0;
> -	SCpnt->request_bufflen = sizeof(SCpnt->sense_buffer);
> -	SCpnt->sc_data_direction = DMA_FROM_DEVICE;
> -	SCpnt->use_sg = 0;
>  	SCpnt->tag = 0;
>  	SCpnt->host_scribble = (void *)fas216_rq_sns_done;
>  
> diff --git a/drivers/scsi/arm/fas216.h b/drivers/scsi/arm/fas216.h
> index 00e5f05..b65f4cf 100644
> --- a/drivers/scsi/arm/fas216.h
> +++ b/drivers/scsi/arm/fas216.h
> @@ -16,6 +16,8 @@
>  #define NO_IRQ 255
>  #endif
>  
> +#include <scsi/scsi_eh.h>
> +
>  #include "queue.h"
>  #include "msgqueue.h"
>  
> @@ -311,6 +313,7 @@ typedef struct {
>  
>  	/* miscellaneous */
>  	int			internal_done;		/* flag to indicate request done */
> +	struct scsi_eh_save	ses;		/* holds request sense restore info */
>  	unsigned long		magic_end;
>  } FAS216_Info;
>  

Yes the pointer thing, Thanks James.

Andrew this patch was in -mm for two month or so. I was under the impression
that you have an arm cross compiler that tries to build every -mm kernel.
Is it possible that for some reason this portion did not get compiled?
Is there a place that one can inspect the output of -mm compilations, Specially
for cross compiled ARCHs?

Boaz
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