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Bryan O'Donoghue fece9c87cb greybus: Ensure gb->mutex is held when adding timer 
Currently in loopback on the async path we issue an operation and then add
a timer to time-out that operation should it fail to complete. Looking at a
backtrace given in its feasible op_async->pending can be true and
del_timer() can run before add_timer() has run. In the callback handler we
already hold gb->mutex. This patch fixes that potential race by ensuring we
hold gb->mutex both when we are adding and when we are removing the
relevant timer.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reported-and-tested-by: Axel Haslam <ahaslam@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
2016-03-16 21:49:31 -07:00
drivers/staging/greybus greybus: Ensure gb->mutex is held when adding timer 2016-03-16 21:49:31 -07:00