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| author | Takashi Iwai <tiwai@suse.de> | 2013-05-22 18:28:38 +0200 |
|---|---|---|
| committer | Doug Zobel <dzobel1@motorola.com> | 2014-11-17 09:12:16 -0600 |
| commit | 70f0e2337725fd14899a6b76c6aae2dbda8f6ba4 (patch) | |
| tree | e68eba9ed571f0be68d7637ec76d1efbd34f2007 /drivers/video/omap2/displays/panel-minnow.c | |
| parent | da1f2d42974e2f72cb0e53cf60e48254ed00f741 (diff) | |
| download | olio-linux-3.10-70f0e2337725fd14899a6b76c6aae2dbda8f6ba4.tar.xz olio-linux-3.10-70f0e2337725fd14899a6b76c6aae2dbda8f6ba4.zip | |
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>
Conflicts:
drivers/base/firmware_class.c
Change-Id: I7ff6c198cd34090e55845b9d4035b1e5dc86226b
Diffstat (limited to 'drivers/video/omap2/displays/panel-minnow.c')
0 files changed, 0 insertions, 0 deletions