linux-kernel - Re: 2.6.26-rc2-mm1 (SCSI

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Date:	Fri, 23 May 2008 13:28:48 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	sekharan@...ibm.com
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-kernel@...r.kernel.org, hare@...e.de,
	scsi <linux-scsi@...r.kernel.org>
Subject: Re: 2.6.26-rc2-mm1 (SCSI_DH build errors)

Chandra Seetharaman wrote:
> Yikes.... Sorry again... Hopefully this attached patch work properly.

Did it build cleanly for you?
Hint:
Use SCSI_DH as module and MD_MULTIPATH=y.  Build errors for me.

> chandra
> On Thu, 2008-05-22 at 20:25 -0700, Andrew Morton wrote:
>> On Thu, 15 May 2008 12:56:14 -0700 Chandra Seetharaman <sekharan@...ibm.com> wrote:
>>
>>> Hi James, Andrew,
>>>
>>> Here is a patch to remove the automatic "select" of scsi_dh for
>>> dm-multipath.
>>>
>>> Sorry about the mishap.
>>>
>>>
>> This is busted.
>>
> -------------------------
> Do not automatically "select" SCSI_DH for dm-multipath. If SCSI_DH
> doesn't exist,just do not allow  hardware handlers to be used.
> 
> Handle SCSI_DH being a module also.
> 
> Signed-off-by: Chandra Seetharaman <sekharan@...ibm.com>
> Reported-by: Randy Dunlap <randy.dunlap@...cle.com>
> Reported-by: Andrew Morton <akpm@...ux-foundation.org>
> Cc: James Bottomley <James.Bottomley@...senPartnership.com>
> Cc: Alasdair G Kergon <agk@...hat.com>
> Cc: Mike Christie <michaelc@...wisc.edu>
> Cc: Hannes Reinecke <hare@...e.de>
> ---
> 
> Index: scsi-misc-2.6/drivers/md/Kconfig
> ===================================================================
> --- scsi-misc-2.6.orig/drivers/md/Kconfig
> +++ scsi-misc-2.6/drivers/md/Kconfig
> @@ -252,7 +252,6 @@ config DM_ZERO
>  config DM_MULTIPATH
>  	tristate "Multipath target"
>  	depends on BLK_DEV_DM
> -	select SCSI_DH
>  	---help---
>  	  Allow volume managers to support multipath hardware.
>  
> Index: scsi-misc-2.6/drivers/md/dm-mpath.c
> ===================================================================
> --- scsi-misc-2.6.orig/drivers/md/dm-mpath.c
> +++ scsi-misc-2.6/drivers/md/dm-mpath.c
> @@ -664,6 +664,8 @@ static int parse_hw_handler(struct arg_s
>  	request_module("scsi_dh_%s", m->hw_handler_name);
>  	if (scsi_dh_handler_exist(m->hw_handler_name) == 0) {
>  		ti->error = "unknown hardware handler type";
> +		kfree(m->hw_handler_name);
> +		m->hw_handler_name = NULL;
>  		return -EINVAL;
>  	}
>  	consume(as, hw_argc - 1);
> Index: scsi-misc-2.6/include/scsi/scsi_dh.h
> ===================================================================
> --- scsi-misc-2.6.orig/include/scsi/scsi_dh.h
> +++ scsi-misc-2.6/include/scsi/scsi_dh.h
> @@ -54,6 +54,16 @@ enum {
>  	SCSI_DH_NOSYS,
>  	SCSI_DH_DRIVER_MAX,
>  };
> -
> +#if defined(CONFIG_SCSI_DH) || defined(CONFIG_SCSI_DH_MODULE)
>  extern int scsi_dh_activate(struct request_queue *);
>  extern int scsi_dh_handler_exist(const char *);
> +#else
> +static inline int scsi_dh_activate(struct request_queue *req)
> +{
> +	return 0;
> +}
> +static inline int scsi_dh_handler_exist(const char *name)
> +{
> +	return 0;
> +}
> +#endif
> 
> 


-- 
~Randy
--
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