diff mbox

spi: imx: read back the RX/TX watermark levels earlier

Message ID 1427877975-816-1-git-send-email-l.stach@pengutronix.de (mailing list archive)
State Accepted
Commit f511ab09dfb0fe7b2335eccac51ff9f001a32e4a
Headers show

Commit Message

Lucas Stach April 1, 2015, 8:46 a.m. UTC 
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.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
 drivers/spi/spi-imx.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Mark Brown April 1, 2015, 8:31 p.m. UTC | #1 
On Wed, Apr 01, 2015 at 10:46:15AM +0200, Lucas Stach wrote:
> 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.

Applied, thanks.
Mark Brown April 1, 2015, 8:32 p.m. UTC | #2 
On Wed, Apr 01, 2015 at 10:46:15AM +0200, Lucas Stach wrote:
> 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.

Applied, thanks.
diff mbox

Patch

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;