spi: fix a possible concurrency issue
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b63be2e08e
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1d2a9efa55
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@ -467,12 +467,14 @@ static void SPI_SLAVE_ISR_ATTR spi_intr(void *arg)
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}
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}
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}
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}
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//Disable interrupt before checking to avoid concurrency issue.
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esp_intr_disable(host->intr);
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//Grab next transaction
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//Grab next transaction
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r = xQueueReceiveFromISR(host->trans_queue, &trans, &do_yield);
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r = xQueueReceiveFromISR(host->trans_queue, &trans, &do_yield);
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if (!r) {
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if (r) {
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//No packet waiting. Disable interrupt.
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//enable the interrupt again if there is packet to send
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esp_intr_disable(host->intr);
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esp_intr_enable(host->intr);
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} else {
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//We have a transaction. Send it.
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//We have a transaction. Send it.
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host->hw->slave.trans_done = 0; //clear int bit
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host->hw->slave.trans_done = 0; //clear int bit
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host->cur_trans = trans;
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host->cur_trans = trans;
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