William Breathitt Gray 3b7509b6f5 counter: 104-quad-8: Fix race condition between FLAG and CNTR reads ... commit 4aa3b75c74603c3374877d5fd18ad9cc3a9a62ed upstream. The Counter (CNTR) register is 24 bits wide, but we can have an effective 25-bit count value by setting bit 24 to the XOR of the Borrow flag and Carry flag. The flags can be read from the FLAG register, but a race condition exists: the Borrow flag and Carry flag are instantaneous and could change by the time the count value is read from the CNTR register. Since the race condition could result in an incorrect 25-bit count value, remove support for 25-bit count values from this driver; hard-coded maximum count values are replaced by a LS7267_CNTR_MAX define for consistency and clarity. Fixes: 28e5d3bb03 ("iio: 104-quad-8: Add IIO support for the ACCES 104-QUAD-8") Cc: <stable@vger.kernel.org> # 6.1.x Cc: <stable@vger.kernel.org> # 6.2.x Link: https://lore.kernel.org/r/20230312231554.134858-1-william.gray@linaro.org/ Signed-off-by: William Breathitt Gray <william.gray@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-05-17 11:35:31 +02:00
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104-quad-8.c	counter: 104-quad-8: Fix race condition between FLAG and CNTR reads	2023-05-17 11:35:31 +02:00
counter.c
ftm-quaddec.c
Kconfig
Makefile
stm32-lptimer-cnt.c	counter: stm32-lptimer-cnt: fix the check on arr and cmp registers update	2023-01-18 11:41:24 +01:00
stm32-timer-cnt.c	counter: stm32-timer-cnt: fix ceiling miss-alignment with reload register	2021-04-14 08:24:09 +02:00