linux-kernel - Re: [PATCH 1/2] mtip32xx: Remove 'registers' and 'flags' from sysfs

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Date:	Tue, 5 Jun 2012 11:18:15 -0700
From:	Asai Thambi S P <asamymuthupa@...ron.com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	Jens Axboe <axboe@...nel.dk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sam Bradshaw <sbradshaw@...ron.com>
Subject: Re: [PATCH 1/2] mtip32xx: Remove 'registers' and 'flags' from sysfs

On 6/5/2012 2:33 AM, Greg KH wrote:

> On Mon, Jun 04, 2012 at 12:43:03PM -0700, Asai Thambi S P wrote:
>>
>> This patch removes entries 'registers' and 'flags' from sysfs. Updated ABI file
>> to reflect this change.
>>
>> Reported-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>> Signed-off-by: Asai Thambi S P <asamymuthupa@...ron.com>
> 
> Much nicer, thanks for doing this:
> 
> Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> But, one question on a different sysfs file:
> 
>>  What:           /sys/block/rssd*/status
>>  Date:           April 2012
>>  KernelVersion:  3.4
>>  Contact:        Asai Thambi S P <asamymuthupa@...ron.com>
>>  Description:    This is a read-only file. Indicates the status of the device.
> 
> What "status" is this showing?  Why is this a sysfs file?  Who
> needs/wants it?


This shows the device status - online, write_protect or thermal_shutdown. This
would be used by management application.

> 
> Also, if you really want to properly create sysfs files, use the default
> attributes for the driver.  As it is, you are creating them after
> userspace is notified about the device showing up, which races with the
> creation of your additional file(s).  Use the properly driver core field
> to have the core create, and remove them, automatically, which saves you
> code, and fixes bugs you didn't realize you had :)
 

I have not thought about this. Thanks for the insight. I will look into it.

--
Regards,
Asai Thambi
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