Commit 6c0e9f05 authored by Thomas Fourier's avatar Thomas Fourier Committed by Greg Kroah-Hartman
Browse files

pch_uart: Fix dma_sync_sg_for_device() nents value 



The dma_sync_sg_for_device() functions should be called with the same
nents as the dma_map_sg(), not the value the map function returned
according to the documentation in Documentation/core-api/dma-api.rst:450:
	With the sync_sg API, all the parameters must be the same
	as those passed into the sg mapping API.

Fixes: da3564ee ("pch_uart: add multi-scatter processing")
Cc: stable <stable@kernel.org>
Signed-off-by: default avatarThomas Fourier <fourier.thomas@gmail.com>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20250701113452.18590-2-fourier.thomas@gmail.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 273cc340

drivers/tty/serial/pch_uart.c

+1 −1
Original line number Diff line number Diff line
@@ -954,7 +954,7 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv) 
			__func__);

		return 0;

	}

	dma_sync_sg_for_device(port->dev, priv->sg_tx_p, nent, DMA_TO_DEVICE);

	dma_sync_sg_for_device(port->dev, priv->sg_tx_p, num, DMA_TO_DEVICE);

	priv->desc_tx = desc;

	desc->callback = pch_dma_tx_complete;

	desc->callback_param = priv;