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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>