linux-kernel - [PATCH 4.4 70/72] spi: davinci: fix up dma_mapping

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Date:   Fri,  6 Apr 2018 15:24:11 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Ben Hutchings <ben.hutchings@...ethink.co.uk>,
        Kevin Hilman <khilman@...libre.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.4 70/72] spi: davinci: fix up dma_mapping_error() incorrect patch

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

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

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

commit 11dd9e2c480324b46118ff708ea2ca8d7022539b, which is commit
c5a2a394835f473ae23931eda5066d3771d7b2f8 upstream had an error in it.

Ben writes:
    The '!' needs to be deleted.  This appears to have been fixed upstream
    by:

    commit 8aedbf580d21121d2a032e4c8ea12d8d2d85e275
    Author: Fabien Parent <fparent@...libre.com>
    Date:   Thu Feb 23 19:01:56 2017 +0100

	spi: davinci: Use SPI framework to handle DMA mapping

    which is not suitable for stable.

So I'm just fixing this up directly.

Reported-by: Ben Hutchings <ben.hutchings@...ethink.co.uk>
Cc: Kevin Hilman <khilman@...libre.com>
Cc: Mark Brown <broonie@...nel.org>
Cc: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/spi/spi-davinci.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/spi/spi-davinci.c
+++ b/drivers/spi/spi-davinci.c
@@ -651,7 +651,7 @@ static int davinci_spi_bufs(struct spi_d
 			buf = t->rx_buf;
 		t->rx_dma = dma_map_single(&spi->dev, buf,
 				t->len, DMA_FROM_DEVICE);
-		if (dma_mapping_error(&spi->dev, !t->rx_dma)) {
+		if (dma_mapping_error(&spi->dev, t->rx_dma)) {
 			ret = -EFAULT;
 			goto err_rx_map;
 		}