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drivers/uart: stm32: don't call k_yield on poll_out

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Some tests like:
    tests/kernel/sched/metairq/kernel.scheduler.metairq
    tests/kernel/profiling/profiling_api/kernel.common.profiling
    tests/kernel/sched/schedule_api/kernel.scheduler
    tests/kernel/sched/schedule_api/kernel.scheduler.multiq
    tests/kernel/profiling/profiling_api/kernel.common.profiling
    tests/kernel/workq/work_queue/kernel.workqueue

don't support that the current thread change when writing a message with
printk (which uses poll_out). So, we remove the call to k_yield which is
useful only for optimizing cpu usage by forcing a thread change if the
usart send stack is full.

Signed-off-by: Julien D'ascenzio <julien.dascenzio@paratronic.fr>
This commit is contained in:
Julien D'ascenzio 2021-12-13 16:05:36 +01:00 • committed by Christopher Friedt
commit 4f9c79c867
1 changed files with 0 additions and 4 deletions
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4
drivers/serial/uart_stm32.c
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@ -543,10 +543,6 @@ static void uart_stm32_poll_out(const struct device *dev,
} }
irq_unlock(key); irq_unlock(key);
} }
if (!k_is_in_isr()) {
/* yield execution to another thread of the same or higher priority. */
k_yield();
}
} }
#ifdef CONFIG_PM #ifdef CONFIG_PM