From: Dmitry Torokhov <dtor_core@ameritech.net>
To: linux-kernel@vger.kernel.org, Greg KH <gregkh@suse.de>,
       Jean Delvare <khali@linux-fr.org>
Subject: [RFC/PATCH 0/5] read/write on attribute w/o show/store should return -ENOSYS
Date: Thu, 28 Apr 2005 00:30:09 -0500
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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,
-EACCESS or -EINVAL.

I think we should unify implementations and have them all return -ENOSYS
(function not implemented) when corresponding method (show/store) is
missing.

-- 
Dmitry
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