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pch_uart: Fix dma_sync_sg_for_device() nents value

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commit 6c0e9f05c9d7875995b0e92ace71be947f280bbd upstream.

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: da3564ee02 ("pch_uart: add multi-scatter processing")
Cc: stable <stable@kernel.org>
Signed-off-by: Thomas Fourier <fourier.thomas@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20250701113452.18590-2-fourier.thomas@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Fourier 2025-07-01 13:34:52 +02:00 • committed by Greg Kroah-Hartman
commit fe96b632ad
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/serial/pch_uart.c
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@ -1025,7 +1025,7 @@ 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;