Messages in this thread | | | From | Bartosz Golaszewski <> | Subject | [PATCH 0/2] gpiolib: use a read-write semaphore to protect the GPIO device list | Date | Thu, 21 Dec 2023 19:43:14 +0100 |
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From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
I'm still figuring out how to keep GPIO descriptors coherent while (mostly) lockless. In the meantime, I found a potential race-condition during GPIO descriptor lookup and also figured that the correct way to protect the GPIO device list is actually a read-write semaphore as we're not modifying the list very often and readers should be able to iterate over it concurrently.
Bartosz Golaszewski (2): gpiolib: replace the GPIO device mutex with a read-write semaphore gpiolib: pin GPIO devices in place during descriptor lookup
drivers/gpio/gpiolib-sysfs.c | 2 +- drivers/gpio/gpiolib.c | 58 ++++++++++++++++++++---------------- drivers/gpio/gpiolib.h | 2 +- 3 files changed, 34 insertions(+), 28 deletions(-)
-- 2.40.1
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