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[PATCH v4 1/3] ibmvscsi: make parameters max_id and max_channel read-only

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  [PATCH v4 1/3] ibmvscsi: make parameters max_id and max_channel read-only Laurent Vivier <lvivier@redhat.com> - 2015-11-09 15:50 +0100
    Re: [PATCH v4 1/3] ibmvscsi: make parameters max_id and max_channel  read-only James Bottomley <James.Bottomley@HansenPartnership.com> - 2015-11-09 16:10 +0100
      Re: [PATCH v4 1/3] ibmvscsi: make parameters max_id and max_channel  read-only Laurent Vivier <lvivier@redhat.com> - 2015-11-09 16:30 +0100

#1265734 — [PATCH v4 1/3] ibmvscsi: make parameters max_id and max_channel read-only

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.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
---
 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");
-- 
2.1.0

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#1265749 — Re: [PATCH v4 1/3] ibmvscsi: make parameters max_id and max_channel read-only

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 <lvivier@redhat.com>
> ---
>  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");



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#1265764 — Re: [PATCH v4 1/3] ibmvscsi: make parameters max_id and max_channel read-only

On 09/11/2015 16:07, James Bottomley wrote:
> 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,

Yes, but the user was me and it is easy to confuse me...

> but this is a standard pattern in quite a few drivers, so you'd need to
> argue why vscsi users are special.

vscsi users are not special, I'll remove this patch from the series.

thanks,
Laurent

> James
> 
>> Signed-off-by: Laurent Vivier <lvivier@redhat.com>
>> ---
>>  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");
> 
> 
> 
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