d501d37841
The quad8_action_read() function checks the Count function mode and
Count direction without first acquiring a lock. This is a race condition
because the function mode could change by the time the direction is
checked.
Because the quad8_function_read() already acquires a lock internally,
the quad8_function_read() is refactored to spin out the no-lock code to
a new quad8_function_get() function.
To resolve the race condition in quad8_action_read(), a lock is acquired
before calling quad8_function_get() and quad8_direction_read() in order
to get both function mode and direction atomically.
Fixes:
|
||
|---|---|---|
| .. | ||
| 104-quad-8.c | ||
| Kconfig | ||
| Makefile | ||
| counter-chrdev.c | ||
| counter-chrdev.h | ||
| counter-core.c | ||
| counter-sysfs.c | ||
| counter-sysfs.h | ||
| ftm-quaddec.c | ||
| intel-qep.c | ||
| interrupt-cnt.c | ||
| microchip-tcb-capture.c | ||
| stm32-lptimer-cnt.c | ||
| stm32-timer-cnt.c | ||
| ti-ecap-capture.c | ||
| ti-eqep.c | ||