Messages in this thread | | | From | Anton Volkov <> | Subject | Possible race in ucb1400_ts.ko | Date | Tue, 15 Aug 2017 16:46:25 +0300 |
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Hello.
While searching for races in the Linux kernel I've come across "drivers/input/touchscreen/ucb1400_ts.ko" module. Here is a question that I came up with while analyzing results. Lines are given using the info from Linux v4.12.
Consider the following case:
Thread 1: Thread 2: ucb1400_suspend ->ucb1400_ts_start ucb->stopped = false enable_irq()
ucb1400_resume ->ucb1400_ts_stop ucb1400_irq ucb->stopped = true while(!ucb->stopped && ...) (ucb1400_ts.c: line 230) (ucb1400_ts.c: line 202) disable_irq()
The value of ucb->stopped may be changed in the midst of 'while' loop iterations or prevent all of them from happening. Is this feasible from your point of view? If so, is it a benign race or is it serious?
Thank you for your time.
-- Anton Volkov Linux Verification Center, ISPRAS web: http://linuxtesting.org e-mail: avolkov@ispras.ru
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