Re: [RFC/PATCH 0/5] read/write on attribute w/o show/store should return -ENOSYS

From: Greg KH
Date: Thu Apr 28 2005 - 12:28:57 EST

On Thu, Apr 28, 2005 at 12:30:09AM -0500, Dmitry Torokhov wrote:
> Hi,
> Jean Delvare has noticed that if a driver happens to declare its
> attribute as RW but doesn't provide store() method attempt to write
> into such attribute will cause spinning process as most of the
> attribute implementations return 0 in case of missing store causing
> endless retries. In some cases missing show/store will return -EPERM,
> I think we should unify implementations and have them all return -ENOSYS
> (function not implemented) when corresponding method (show/store) is
> missing.

What is the POSIX standard for this? ENOSYS or EACCESS?

Or anyone have a link that I can look this up at?


greg k-h

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