firmware loader: document firmware cache mechanism
This patch documents the firmware cache mechanism so that
users of request_firmware() know that it can be called
safely inside device's suspend and resume callback, and
the device's firmware needn't be cached any more by individual
driver itself to deal with firmware loss during system resume.
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/Documentation/firmware_class/README b/Documentation/firmware_class/README
index e9fce78..43fada9 100644
--- a/Documentation/firmware_class/README
+++ b/Documentation/firmware_class/README
@@ -119,3 +119,10 @@
on the setup, so I think that the choice on what firmware to make
persistent should be left to userspace.
+ about firmware cache:
+ --------------------
+ After firmware cache mechanism is introduced during system sleep,
+ request_firmware can be called safely inside device's suspend and
+ resume callback, and callers need't cache the firmware by
+ themselves any more for dealing with firmware loss during system
+ resume.