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ca9d081b49
Commit75a2d4226b("driver core: class: mark the struct class for sysfs callbacks as constant") changed the attribute to use CLASS_ATTR_RO() which changed the permission from 0400 to 0444. But this atribute is "special" in that reading it modifies the system state, so it MUST be set to 0400 so that only root processes can muck around with it. Fix this all up, AND document this so that I don't change it again in 3-4 years when I stumble across it and wonder why it's an open-coded _ATTR() macro. Reported-by: Denis Efremov <efremov@linux.com> Fixes:75a2d4226b("driver core: class: mark the struct class for sysfs callbacks as constant") Link: https://lore.kernel.org/r/2023041810-angelic-conical-52d8@gregkh Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.