linux-kernel - Re: queued patches for SCSI for 2.6.24

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Date:	Wed, 26 Sep 2007 09:07:37 -0500
From:	James Bottomley <James.Bottomley@...elEye.com>
To:	FUJITA Tomonori <tomof@....org>
Cc:	jeff@...zik.org, matthew@....cx, akpm@...ux-foundation.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	fujita.tomonori@....ntt.co.jp
Subject: Re: queued patches for SCSI for 2.6.24

On Wed, 2007-09-26 at 13:56 +0900, FUJITA Tomonori wrote:
> On Tue, 25 Sep 2007 22:45:53 -0500
> James Bottomley <James.Bottomley@...elEye.com> wrote:
> 
> > On Tue, 2007-09-25 at 23:34 -0400, Jeff Garzik wrote:
> > > Matthew Wilcox wrote:
> > > > On Tue, Sep 25, 2007 at 10:37:33PM -0400, Jeff Garzik wrote:
> > > >> Are there any const-ness worries for scsi_host_template, or plans for 
> > > >> the future?  I do not see any other examples of the host template 
> > > >> members getting modified.
> > > > 
> > > > Goodness, Jeff, you haven't looked too hard.  There's dozens of examples
> > > > I've come across trawling the horrible unmaintained drivers.  I'd love
> > > > to see scsi_host_template become const, but it's not happening any time
> > > > soon, and we can address this little piece when the time comes.
> > > 
> > > Well, sure, the driver is the owner of that memory.
> > > 
> > > We're talking about common code.
> > > 
> > > If everybody agrees SHT is R/W in the core, Fujita-san's patch is fine.
> > 
> > Well, I don't like mucking with the template either.
> > 
> > This whole mess is generated basically because the zero default of the
> > template should be treated as initiator.  How about this, which makes
> > that manifest?
> > 
> > James
> > 
> > diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
> > index adc9559..7e26440 100644
> > --- a/drivers/scsi/hosts.c
> > +++ b/drivers/scsi/hosts.c
> > @@ -342,7 +342,11 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
> >  	shost->unchecked_isa_dma = sht->unchecked_isa_dma;
> >  	shost->use_clustering = sht->use_clustering;
> >  	shost->ordered_tag = sht->ordered_tag;
> > -	shost->active_mode = sht->supported_mode;
> > +	if (sht->supported_mode == MODE_UNKNOWN)
> > +		/* means we didn't set it ... default to INITIATOR */
> > +		shost->active_mode = MODE_INITIATOR;
> > +	else
> > +		shost->active_mode = sht->supported_mode;
> >  
> >  	if (sht->max_host_blocked)
> >  		shost->max_host_blocked = sht->max_host_blocked;
> > diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
> > index 0088c4d..4965e9e 100644
> > --- a/drivers/scsi/scsi_sysfs.c
> > +++ b/drivers/scsi/scsi_sysfs.c
> > @@ -209,11 +209,13 @@ show_shost_mode(unsigned int mode, char *buf)
> >  static ssize_t show_shost_supported_mode(struct class_device *class_dev, char *buf)
> >  {
> >  	struct Scsi_Host *shost = class_to_shost(class_dev);
> > +	unsigned int supported_mode = shost->hostt->supported_mode;
> >  
> > -	if (shost->hostt->supported_mode == MODE_UNKNOWN)
> > -		return snprintf(buf, 20, "unknown\n");
> > -	else
> > -		return show_shost_mode(shost->hostt->supported_mode, buf);
> > +	if (supported_mode == MODE_UNKNOWN)
> > +		/* by default this should be initiator */
> > +		supported_mode = MODE_INITIATOR;
> > +
> > +	return show_shost_mode(shost->hostt->supported_mode, buf);
> 
> should be:
> 
> return show_shost_mode(supported_mode, buf);

Yes, sorry ... code in haste etc.

James


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