Merge branch 'spi-4.20' into spi-4.21 for bcm stuff.
[sfrench/cifs-2.6.git] / drivers / spi / spi-bcm2835.c
index b0b87ff936c70b1fc968814e93c001242eae51c0..43c6ca535800a4d18996d4ec4bd5873626b3cfcf 100644 (file)
@@ -155,8 +155,7 @@ static irqreturn_t bcm2835_spi_interrupt(int irq, void *dev_id)
        /* Write as many bytes as possible to FIFO */
        bcm2835_wr_fifo(bs);
 
-       /* based on flags decide if we can finish the transfer */
-       if (bcm2835_rd(bs, BCM2835_SPI_CS) & BCM2835_SPI_CS_DONE) {
+       if (!bs->rx_len) {
                /* Transfer complete - reset SPI HW */
                bcm2835_spi_reset_hw(master);
                /* wake up the framework */
@@ -233,10 +232,9 @@ static void bcm2835_spi_dma_done(void *data)
         * is called the tx-dma must have finished - can't get to this
         * situation otherwise...
         */
-       dmaengine_terminate_all(master->dma_tx);
-
-       /* mark as no longer pending */
-       bs->dma_pending = 0;
+       if (cmpxchg(&bs->dma_pending, true, false)) {
+               dmaengine_terminate_all(master->dma_tx);
+       }
 
        /* and mark as completed */;
        complete(&master->xfer_completion);
@@ -342,6 +340,7 @@ static int bcm2835_spi_transfer_one_dma(struct spi_master *master,
        if (ret) {
                /* need to reset on errors */
                dmaengine_terminate_all(master->dma_tx);
+               bs->dma_pending = false;
                bcm2835_spi_reset_hw(master);
                return ret;
        }
@@ -617,10 +616,9 @@ static void bcm2835_spi_handle_err(struct spi_master *master,
        struct bcm2835_spi *bs = spi_master_get_devdata(master);
 
        /* if an error occurred and we have an active dma, then terminate */
-       if (bs->dma_pending) {
+       if (cmpxchg(&bs->dma_pending, true, false)) {
                dmaengine_terminate_all(master->dma_tx);
                dmaengine_terminate_all(master->dma_rx);
-               bs->dma_pending = 0;
        }
        /* and reset */
        bcm2835_spi_reset_hw(master);