linux-kernel - Re: [PATCH 14/22] ncr5380: Add MAX

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Message-ID: <alpine.LNX.2.00.1603151341080.9662@nippy.intranet>
Date:	Tue, 15 Mar 2016 14:20:55 +1100 (AEDT)
From:	Finn Thain <fthain@...egraphics.com.au>
To:	Christoph Hellwig <hch@...radead.org>
cc:	"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Michael Schmitz <schmitzmic@...il.com>,
	linux-m68k@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ondrej Zary <linux@...nbow-software.org>,
	Sam Creasey <sammy@...my.net>
Subject: Re: [PATCH 14/22] ncr5380: Add MAX_LUN limit

On Mon, 14 Mar 2016, Christoph Hellwig wrote:

> On Mon, Mar 14, 2016 at 03:27:14PM +1100, Finn Thain wrote:
> > The driver has a limit of eight LUs because of the byte-sized bitfield
> > that is used for busy flags. Reject commands with LUN > 7.
> 
> Please just set the max_lun parameter in the host template, which will 
> take care of this.

The reason I didn't do that initially was that I could not convince myself 
that all command submission paths would enforce the shost->max_lun limit. 
But I'll take your word for it.

I don't think the host template is the right place for this (there are 
about ten of these that would need to be changed anyway) because 
scsi_host_alloc() assigns shost->max_lun = 8. So I'll add the 
instance->max_lun = 7 assignment to NCR5380_init().

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