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spi: rspi: Fix interrupted DMA transfers 

commit 8dbbaa47b9 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>
pull/10/head
Geert Uytterhoeven 2018-09-05 10:49:39 +02:00 committed by Greg Kroah-Hartman
parent 082e34f367
commit b6adc1f24b
1 changed files with 6 additions and 4 deletions
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10
drivers/spi/spi-rspi.c
View File

@ -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)