diff options
| author | Takashi Iwai <[email protected]> | 2013-05-22 18:28:38 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2013-06-03 13:57:29 -0700 |
| commit | fe304143b0c3d43fbf13773bcd4a7989a1fb4e1c (patch) | |
| tree | 882efb8d1ce0c0ed0140e5c88d89677ce9037b2b /include/linux/fpga/fpga-mgr.h | |
| parent | d05c39ea67f5786a549ac9d672d2951992b658c6 (diff) | |
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 <[email protected]>
Acked-by: Ming Lei <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'include/linux/fpga/fpga-mgr.h')
0 files changed, 0 insertions, 0 deletions