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authorLucas Stach <l.stach@pengutronix.de>2015-04-01 10:46:15 +0200
committerMark Brown <broonie@kernel.org>2015-04-01 21:32:38 +0100
commitf511ab09dfb0fe7b2335eccac51ff9f001a32e4a (patch)
tree83984d6254f582a388939c39b69e2eccc254780a /drivers/spi
parentc517d838eb7d07bbe9507871fab3931deccff539 (diff)
spi: imx: read back the RX/TX watermark levels earlier
They are used to decide if the controller can do DMA on a buffer of a specific length and thus are needed before any transfer is attempted. This fixes a memory leak where the SPI core uses the drivers can_dma() callback to determine if a buffer needs to be mapped. As the watermark levels aren't correct at that point the driver falsely claims to be able to DMA the buffer when it fact it isn't. After the transfer has been done the core uses the same callback to determine if it needs to unmap the buffers. As the driver now correctly claims to not being able to DMA the buffer the core doesn't attempt to unmap the buffer which leaves the SGT leaking. Fixes: f62caccd12c17e4 (spi: spi-imx: add DMA support) Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Signed-off-by: Mark Brown <broonie@kernel.org> Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-imx.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 6fea4af51c41..aea3a67e5ce1 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -370,8 +370,6 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx,
if (spi_imx->dma_is_inited) {
dma = readl(spi_imx->base + MX51_ECSPI_DMA);
- spi_imx->tx_wml = spi_imx_get_fifosize(spi_imx) / 2;
- spi_imx->rx_wml = spi_imx_get_fifosize(spi_imx) / 2;
spi_imx->rxt_wml = spi_imx_get_fifosize(spi_imx) / 2;
rx_wml_cfg = spi_imx->rx_wml << MX51_ECSPI_DMA_RX_WML_OFFSET;
tx_wml_cfg = spi_imx->tx_wml << MX51_ECSPI_DMA_TX_WML_OFFSET;
@@ -868,6 +866,8 @@ static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
master->max_dma_len = MAX_SDMA_BD_BYTES;
spi_imx->bitbang.master->flags = SPI_MASTER_MUST_RX |
SPI_MASTER_MUST_TX;
+ spi_imx->tx_wml = spi_imx_get_fifosize(spi_imx) / 2;
+ spi_imx->rx_wml = spi_imx_get_fifosize(spi_imx) / 2;
spi_imx->dma_is_inited = 1;
return 0;