Ming Lei 65710cb6ea
firmware loader: simplify pages ownership transfer ...
This patch doesn't transfer ownership of pages' buffer to the
instance of firmware until the firmware loading is completed,
which will simplify firmware_loading_store a lot, so help
to introduce the following cache_firmware and uncache_firmware
mechanism during system suspend-resume cycle.
In fact, this patch fixes one bug: if writing data into
firmware loader device is bypassed between writting 1 and 0 to
'loading', OOPS will be triggered without the patch.
Also handle the vmap failure case, and add some comments to make
code more readable.
Signed-off-by: Ming Lei <ming.lei@canonical.com >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org >
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65710cb6ea