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Bryan O'Donoghue 1211915127 greybus: timesync: Enforce TimeSync locks as subordinate to Interface locks 
gb_timesync_svc_teardown() is called from gb_timesync_svc_del() and issues a
command to a remote Interface to switch off its timers. The lock ordering
is TimeSync => Interface in this case. However gb_module_del() takes an
Interface lock then calls gb_interface_del() => gb_timesync_svc_del() in
this case the lock ordering is Interface => TimeSync.

This patch fixes by removing the taking of the Interface mutex in
gb_interface_timesync_do_something(). If an Interface is present in the
TimeSync linked-list - it is by definition intf->enabled.

Reported-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
History 2016-06-23 14:15:21 -07:00
drivers/staging/greybus greybus: timesync: Enforce TimeSync locks as subordinate to Interface locks 2016-06-23 14:15:21 -07:00