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    SubjectRe: [RFC PATCH 00/13] firmware loader: introduce cache/uncache firmware
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    On Wed, Jul 25, 2012 at 1:00 AM, Ming Lei <ming.lei@canonical.com> wrote:
    > Hi,
    >
    > In [1][2], the problem below has been discussed for some time:
    >
    > device's firmware may be lost during suspend/resume
    > cycle because device is unplugged and plugged again
    > or device experiences system power loss in the period.
    > but during resume path, system is still not ready(process
    > frozen, rootfs not usable, ...) to complete loading firmware
    > from user space for the device
    >
    > The conclusion is that caching firmware during suspend/resume cycle
    > is capable of solving the problem.
    >
    > This patchset implements cache/uncache firmware mechanism,
    > and apply the mechnism to cache device's firmware in kernel memory
    > space automatically during suspend/resume cyclye, so device can
    > load its firmware easily during resume path. When resume is completed
    > and system is ready, the cached firmwares will be removed from
    > kernel memory later.

    $git diff --stat
    drivers/base/devres.c | 42 +++
    drivers/base/firmware_class.c | 749 +++++++++++++++++++++++++++++++++++------
    include/linux/device.h | 3 +
    include/linux/firmware.h | 15 +
    4 files changed, 705 insertions(+), 104 deletions(-)


    Thanks,
    --
    Ming Lei


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