[PATCH 4.20 080/145] spi: bcm2835: Fix race on DMA termination

[Greg Kroah-Hartman]

4.20-stable review patch.  If anyone has any objections, please let me know.

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

From: Lukas Wunner <lukas@xxxxxxxxx>

commit e82b0b3828451c1cd331d9f304c6078fcd43b62e upstream.

If a DMA transfer finishes orderly right when spi_transfer_one_message()
determines that it has timed out, the callbacks bcm2835_spi_dma_done()
and bcm2835_spi_handle_err() race to call dmaengine_terminate_all(),
potentially leading to double termination.

Prevent by atomically changing the dma_pending flag before calling
dmaengine_terminate_all().

Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
Fixes: 3ecd37edaa2a ("spi: bcm2835: enable dma modes for transfers meeting certain conditions")
Cc: stable@xxxxxxxxxxxxxxx # v4.2+
Cc: Mathias Duckeck <m.duckeck@xxxxxxxxx>
Cc: Frank Pavlic <f.pavlic@xxxxxxxxx>
Cc: Martin Sperl <kernel@xxxxxxxxxxxxxxxx>
Cc: Noralf TrÃnnes <noralf@xxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/spi/spi-bcm2835.c |   10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

--- a/drivers/spi/spi-bcm2835.c
+++ b/drivers/spi/spi-bcm2835.c
@@ -233,10 +233,9 @@ static void bcm2835_spi_dma_done(void *d
 	 * 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);
@@ -617,10 +616,9 @@ static void bcm2835_spi_handle_err(struc
 	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);