Bluetooth: Controller: Fix some compiler instruction re-ordering
Fix some compiler instruction re-ordering. Mayfly code with cpu_dmb() help avoid stalled memq_ull_rx processing when rx_demux is to be executed using mayfly. Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
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2 changed files with 8 additions and 0 deletions
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@ -3149,6 +3149,7 @@ void ticker_job(void *param)
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instance->job_guard = 0U;
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/* trigger worker if deferred */
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cpu_dmb();
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if (instance->worker_trigger || compare_trigger) {
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instance->sched_cb(TICKER_CALL_ID_JOB, TICKER_CALL_ID_WORKER, 1,
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instance);
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@ -6,8 +6,13 @@
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*/
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#include <stddef.h>
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#include <soc.h>
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#include <zephyr/types.h>
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#include <zephyr/sys/printk.h>
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#include "hal/cpu.h"
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#include "memq.h"
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#include "mayfly.h"
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@ -154,10 +159,12 @@ static void dequeue(uint8_t callee_id, uint8_t caller_id, memq_link_t *link,
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m->_link = link;
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/* reset mayfly state to idle */
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cpu_dmb();
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ack = m->_ack;
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m->_ack = req;
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/* re-insert, if re-pended by interrupt */
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cpu_dmb();
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if (((m->_req - ack) & 0x03) == 1U) {
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#if defined(MAYFLY_UT)
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printk("%s: RACE\n", __func__);
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