From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Bottomley Subject: Re: [PATCH v4 1/3] ibmvscsi: make parameters max_id and max_channel read-only Date: Mon, 09 Nov 2015 07:07:45 -0800 Message-ID: <1447081665.2242.5.camel@HansenPartnership.com> References: <1447080465-17858-1-git-send-email-lvivier@redhat.com> <1447080465-17858-2-git-send-email-lvivier@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: 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 In-Reply-To: <1447080465-17858-2-git-send-email-lvivier@redhat.com> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org 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 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");