Implement this optional ops, called by hwspinlock core while spinning on a lock, between two successive invocations of trylock().
Signed-off-by: Fabien Dessenne <[email protected]> --- drivers/hwspinlock/stm32_hwspinlock.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/hwspinlock/stm32_hwspinlock.c b/drivers/hwspinlock/stm32_hwspinlock.c index 4418392..c8eacf4 100644 --- a/drivers/hwspinlock/stm32_hwspinlock.c +++ b/drivers/hwspinlock/stm32_hwspinlock.c @@ -5,6 +5,7 @@ */ #include <linux/clk.h> +#include <linux/delay.h> #include <linux/hwspinlock.h> #include <linux/io.h> #include <linux/kernel.h> @@ -42,9 +43,15 @@ static void stm32_hwspinlock_unlock(struct hwspinlock *lock) writel(STM32_MUTEX_COREID, lock_addr); } +static void stm32_hwspinlock_relax(struct hwspinlock *lock) +{ + ndelay(50); +} + static const struct hwspinlock_ops stm32_hwspinlock_ops = { .trylock = stm32_hwspinlock_trylock, .unlock = stm32_hwspinlock_unlock, + .relax = stm32_hwspinlock_relax, }; static int stm32_hwspinlock_probe(struct platform_device *pdev) -- 2.7.4
