diff options
| author | Peng Fan <peng.fan@nxp.com> | 2019-11-05 05:51:10 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-17 20:37:21 +0100 |
| commit | d3e83b6532a008200b46c9e7ff04b767d6b34d1c (patch) | |
| tree | 07d6d83b8078450ab9156d1b74cc58d4415320cd /drivers/tty | |
| parent | ec85bb89cc74a60c1afb47f537f9613b795a184a (diff) | |
tty: serial: fsl_lpuart: use the sg count from dma_map_sg
commit 487ee861de176090b055eba5b252b56a3b9973d6 upstream.
The dmaengine_prep_slave_sg needs to use sg count returned
by dma_map_sg, not use sport->dma_tx_nents, because the return
value of dma_map_sg is not always same with "nents".
When enabling iommu for lpuart + edma, iommu framework may concatenate
two sgs into one.
Fixes: 6250cc30c4c4e ("tty: serial: fsl_lpuart: Use scatter/gather DMA for Tx")
Cc: <stable@vger.kernel.org>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/1572932977-17866-1-git-send-email-peng.fan@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/fsl_lpuart.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 32a473f9d1d3..fb2dcb3f8591 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -380,8 +380,8 @@ static void lpuart_dma_tx(struct lpuart_port *sport) } sport->dma_tx_desc = dmaengine_prep_slave_sg(sport->dma_tx_chan, sgl, - sport->dma_tx_nents, - DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT); + ret, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT); if (!sport->dma_tx_desc) { dma_unmap_sg(dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE); dev_err(dev, "Cannot prepare TX slave DMA!\n"); |