spi: rspi: Fix interrupted DMA transfers

BugLink: https://bugs.launchpad.net/bugs/1836287
commit 8dbbaa47b96f6ea5f09f922b4effff3c505cd8cf upstream.

When interrupted, wait_event_interruptible_timeout() returns
-ERESTARTSYS, and the SPI transfer in progress will fail, as expected:

    m25p80 spi0.0: SPI transfer failed: -512
    spi_master spi0: failed to transfer one message from queue

However, as the underlying DMA transfers may not have completed, all
subsequent SPI transfers may start to fail:

    spi_master spi0: receive timeout
    qspi_transfer_out_in() returned -110
    m25p80 spi0.0: SPI transfer failed: -110
    spi_master spi0: failed to transfer one message from queue

Fix this by calling dmaengine_terminate_all() not only for timeouts, but
also for errors.

This can be reproduced on r8a7991/koelsch, using "hd /dev/mtd0" followed
by CTRL-C.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
index 83a0e743cc91507221ef360430be04c3e2263bb7..011a04b7ecb9cf7f542109b40479f03f922d8582 100644 (file)
--- a/drivers/spi/spi-rspi.c
+++ b/drivers/spi/spi-rspi.c
@@ -598,11 +598,13 @@ static int rspi_dma_transfer(struct rspi_data *rspi, struct sg_table *tx,
 
        ret = wait_event_interruptible_timeout(rspi->wait,
                                               rspi->dma_callbacked, HZ);
-       if (ret > 0 && rspi->dma_callbacked)
+       if (ret > 0 && rspi->dma_callbacked) {
                ret = 0;
-       else if (!ret) {
-               dev_err(&rspi->master->dev, "DMA timeout\n");
-               ret = -ETIMEDOUT;
+       } else {
+               if (!ret) {
+                       dev_err(&rspi->master->dev, "DMA timeout\n");
+                       ret = -ETIMEDOUT;
+               }
                if (tx)
                        dmaengine_terminate_all(rspi->master->dma_tx);
                if (rx)