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

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Message-ID: <lsq.1544392233.8330824@decadent.org.uk>
Date:   Sun, 09 Dec 2018 21:50:33 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Geert Uytterhoeven" <geert+renesas@...der.be>,
        "Mark Brown" <broonie@...nel.org>
Subject: [PATCH 3.16 205/328] spi: rspi: Fix interrupted DMA transfers

3.16.62-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Geert Uytterhoeven <geert+renesas@...der.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@...der.be>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.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)