Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751697AbbKIPHu (ORCPT ); Mon, 9 Nov 2015 10:07:50 -0500 Received: from bedivere.hansenpartnership.com ([66.63.167.143]:57160 "EHLO bedivere.hansenpartnership.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750804AbbKIPHr (ORCPT ); Mon, 9 Nov 2015 10:07:47 -0500 Message-ID: <1447081665.2242.5.camel@HansenPartnership.com> Subject: Re: [PATCH v4 1/3] ibmvscsi: make parameters max_id and max_channel read-only From: James Bottomley To: Laurent Vivier Cc: martin.petersen@oracle.com, hare@suse.de, brking@linux.vnet.ibm.com, tyreld@linux.vnet.ibm.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 09 Nov 2015 07:07:45 -0800 In-Reply-To: <1447080465-17858-2-git-send-email-lvivier@redhat.com> References: <1447080465-17858-1-git-send-email-lvivier@redhat.com> <1447080465-17858-2-git-send-email-lvivier@redhat.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.12.11 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1926 Lines: 44 On Mon, 2015-11-09 at 15:47 +0100, Laurent Vivier wrote: > The value of the parameter is never re-read by the driver, > so a new value is ignored. Let know the user he > can't modify it by removing writable attribute. This isn't correct. They're read in every time a new SCSI host is bound. I don't believe VIO is a hot plug bus, so the only way to get the values to propagate is to unbind and rebind the driver. Now if you want to argue they should be read only because users are getting confused about how to propagate the values, that's a different story, but this is a standard pattern in quite a few drivers, so you'd need to argue why vscsi users are special. James > Signed-off-by: Laurent Vivier > --- > drivers/scsi/ibmvscsi/ibmvscsi.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c > index 6a41c36..3e76490 100644 > --- a/drivers/scsi/ibmvscsi/ibmvscsi.c > +++ b/drivers/scsi/ibmvscsi/ibmvscsi.c > @@ -105,9 +105,9 @@ MODULE_AUTHOR("Dave Boutcher"); > MODULE_LICENSE("GPL"); > MODULE_VERSION(IBMVSCSI_VERSION); > > -module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR); > +module_param_named(max_id, max_id, int, S_IRUGO); > MODULE_PARM_DESC(max_id, "Largest ID value for each channel"); > -module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR); > +module_param_named(max_channel, max_channel, int, S_IRUGO); > MODULE_PARM_DESC(max_channel, "Largest channel value"); > module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR); > MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds"); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/