Takashi Iwai fe304143b0
firmware: Avoid deadlock of usermodehelper lock at shutdown ...
When a system goes to reboot/shutdown, it tries to disable the
usermode helper via usermodehelper_disable(). This might be blocked
when a driver tries to load a firmware beforehand and it's stuck by
some reason. For example, dell_rbu driver loads the firmware in
non-hotplug mode and waits for user-space clearing the loading sysfs
flag. If user-space doesn't clear the flag, it waits forever, thus
blocks the reboot, too.
As a workaround, in this patch, the firmware class driver registers a
reboot notifier so that it can abort all pending f/w bufs before
issuing usermodehelper_disable().
Signed-off-by: Takashi Iwai <tiwai@suse.de >
Acked-by: Ming Lei <ming.lei@canonical.com >
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org >
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fe304143b0