William Breathitt Gray 50531cd807 counter: 104-quad-8: Fix race getting function mode and direction ... commit d501d37841 upstream. 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: f1d8a071d4 ("counter: 104-quad-8: Add Generic Counter interface support") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20221020141121.15434-1-william.gray@linaro.org/ Signed-off-by: William Breathitt Gray <william.gray@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-11-04 00:00:23 +09:00
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104-quad-8.c	counter: 104-quad-8: Fix race getting function mode and direction	2022-11-04 00:00:23 +09:00
Kconfig	counter: 104-quad-8: Add COMPILE_TEST depends	2022-03-18 14:04:30 +01:00
Makefile	counter: Add character device interface	2021-10-17 10:53:52 +01:00
counter-chrdev.c	counter: add defaults to switch-statements	2022-03-18 14:04:30 +01:00
counter-chrdev.h	counter: Add character device interface	2021-10-17 10:53:52 +01:00
counter-core.c	counter: Set counter device name	2022-03-18 14:04:30 +01:00
counter-sysfs.c	counter: Stop using dev_get_drvdata() to get the counter device	2022-03-15 19:24:13 +01:00
counter-sysfs.h	counter: Internalize sysfs interface code	2021-10-17 10:52:58 +01:00
ftm-quaddec.c	counter: ftm-quaddec: Convert to new counter registration	2021-12-30 17:44:07 +01:00
intel-qep.c	counter: intel-qep: Convert to new counter registration	2021-12-30 17:44:07 +01:00
interrupt-cnt.c	counter: interrupt-cnt: add counter_push_event()	2022-03-18 14:04:30 +01:00
microchip-tcb-capture.c	counter: microchip-tcb-capture: Handle Signal1 read and Synapse	2022-11-04 00:00:23 +09:00
stm32-lptimer-cnt.c	counter: stm32-lptimer-cnt: Convert to new counter registration	2021-12-30 17:44:07 +01:00
stm32-timer-cnt.c	counter: stm32-timer-cnt: Convert to new counter registration	2021-12-30 17:44:07 +01:00
ti-eqep.c	counter: ti-eqep: Convert to new counter registration	2021-12-30 17:44:07 +01:00