[PATCH 3.16 205/328] spi: rspi: Fix interrupted DMA transfers

Ben Hutchings
2018-12-09T22:17:16Z

From: Geert Uytterhoeven <geert+renesas@glider.be>

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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/spi/spi-rspi.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

--- a/drivers/spi/spi-rspi.c
+++ b/drivers/spi/spi-rspi.c
@@ -538,11 +538,13 @@ static int rspi_dma_transfer(struct rspi

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)