From: Luis R. Rodriguez Date: Thu, 10 May 2018 20:08:50 +0000 (-0700) Subject: Documentation: clarify firmware_class provenance and why we can't rename the module X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f0a462970ee19930518b03798a21cfdb3fd35877;p=linux.git Documentation: clarify firmware_class provenance and why we can't rename the module Clarify the provenance of the firmware loader firmware_class module name and why we cannot rename the module in the future. Reviewed-by: Mauro Carvalho Chehab Reviewed-by: Kees Cook Signed-off-by: Luis R. Rodriguez Signed-off-by: Greg Kroah-Hartman --- diff --git a/Documentation/driver-api/firmware/fallback-mechanisms.rst b/Documentation/driver-api/firmware/fallback-mechanisms.rst index a39323ef7d29a..d35fed65eae97 100644 --- a/Documentation/driver-api/firmware/fallback-mechanisms.rst +++ b/Documentation/driver-api/firmware/fallback-mechanisms.rst @@ -72,9 +72,12 @@ the firmware requested, and establishes it in the device hierarchy by associating the device used to make the request as the device's parent. The sysfs directory's file attributes are defined and controlled through the new device's class (firmware_class) and group (fw_dev_attr_groups). -This is actually where the original firmware_class.c file name comes from, -as originally the only firmware loading mechanism available was the -mechanism we now use as a fallback mechanism. +This is actually where the original firmware_class module name came from, +given that originally the only firmware loading mechanism available was the +mechanism we now use as a fallback mechanism, which registers a struct class +firmware_class. Because the attributes exposed are part of the module name, the +module name firmware_class cannot be renamed in the future, to ensure backward +compatibility with old userspace. To load firmware using the sysfs interface we expose a loading indicator, and a file upload firmware into: