Re: SYSFS "errors"
From: Greg KH
Date: Mon Feb 18 2013 - 16:54:46 EST
On Mon, Feb 18, 2013 at 06:47:42PM -0300, Mauro Carvalho Chehab wrote:
> In the past, the sysfs node creation was done using the raw sysfs support.
> Doing dynamic creation with the old code were much more complex. I guess
> that's the reason why the code was written this way. Now that the code
> uses struct device, it shouldn't be hard to change the code to only
> create this attribute if the device has support for scrub rate setting.
> Yet, that would change the userspace API. I'm not sure what
> applications would rely on the current behavior. So, changing it
> would require some investigation in order to avoid regressions.
Because sysfs is "one value per file" the lack of a file showing up
shouldn't cause any userspace tools any problems, that is why we did
things this way.
But, of course, userspace programmers do know how to mess things up...
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