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spi: fix a possible concurrency issue

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This commit is contained in:
Michael (XIAO Xufeng) 2019-05-31 15:23:10 +08:00
parent 0dcbe15614
commit e238cf85a2
2 changed files with 12 additions and 6 deletions
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8
components/driver/spi_master.c
View File

@ -419,6 +419,9 @@ static void IRAM_ATTR spi_intr(void *arg)
/*------------ new transaction starts here ------------------*/
//ToDo: This is a stupidly simple low-cs-first priority scheme. Make this configurable somehow. - JD
//Disable interrupt before checking to avoid concurrency issue.
esp_intr_disable(host->intr);
for (i=0; i<NO_CS; i++) {
if (host->device[i]) {
r=xQueueReceiveFromISR(host->device[i]->trans_queue, &host->cur_trans_buf, &do_yield);
@ -428,13 +431,14 @@ static void IRAM_ATTR spi_intr(void *arg)
}
}
if (i==NO_CS) {
//No packet waiting. Disable interrupt.
esp_intr_disable(host->intr);
#ifdef CONFIG_PM_ENABLE
//Release APB frequency lock
esp_pm_lock_release(host->pm_lock);
#endif
} else {
//enable the interrupt again if there is packet to send
esp_intr_enable(host->intr);
host->hw->slave.trans_done=0; //clear int bit
//We have a transaction. Send it.
spi_device_t *dev=host->device[i];

10
components/driver/spi_slave.c
View File

@ -375,12 +375,14 @@ static void IRAM_ATTR spi_intr(void *arg)
}
}
//Disable interrupt before checking to avoid concurrency issue.
esp_intr_disable(host->intr);
//Grab next transaction
r = xQueueReceiveFromISR(host->trans_queue, &trans, &do_yield);
if (!r) {
//No packet waiting. Disable interrupt.
esp_intr_disable(host->intr);
} else {
if (r) {
//enable the interrupt again if there is packet to send
esp_intr_enable(host->intr);
//We have a transaction. Send it.
host->hw->slave.trans_done = 0; //clear int bit
host->cur_trans = trans;