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SubjectPossible race in ucb1400_ts.ko
Date
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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