patch "tty: serial: fsl_lpuart: use the sg count from dma_map_sg" added to tty-next

This is a note to let you know that I've just added the patch titled

tty: serial: fsl_lpuart: use the sg count from dma_map_sg

to my tty git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git
in the tty-next branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will also be merged in the next major kernel release during the merge window.

If you have any questions about this process, please let me know.

From 487ee861de176090b055eba5b252b56a3b9973d6 Mon Sep 17 00:00:00 2001
From: Peng Fan <[email protected]>
Date: Tue, 5 Nov 2019 05:51:10 +0000
Subject: tty: serial: fsl_lpuart: use the sg count from dma_map_sg

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.

---
 drivers/tty/serial/fsl_lpuart.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index 22df5f8f48b6..4e128d19e0ad 100644
@@ -437,8 +437,8 @@ 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");

2.23.0