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serial: pch_uart: Pass correct sg to dma_unmap_sg()

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commit e8914b52e5 upstream.

A local variable sg is used to store scatterlist pointer in
pch_dma_tx_complete(). The for loop doing Tx byte accounting before
dma_unmap_sg() alters sg in its increment statement. Therefore, the
pointer passed into dma_unmap_sg() won't match to the one given to
dma_map_sg().

To fix the problem, use priv->sg_tx_p directly in dma_unmap_sg()
instead of the local variable.

Fixes: da3564ee02 ("pch_uart: add multi-scatter processing")
Cc: stable@vger.kernel.org
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230103093435.4396-1-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ilpo Järvinen 2023-01-03 11:34:35 +02:00 • committed by Greg Kroah-Hartman
commit c9da2cb968
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/serial/pch_uart.c
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@ -769,7 +769,7 @@ static void pch_dma_tx_complete(void *arg)
} }
xmit->tail &= UART_XMIT_SIZE - 1; xmit->tail &= UART_XMIT_SIZE - 1;
async_tx_ack(priv->desc_tx); async_tx_ack(priv->desc_tx);
dma_unmap_sg(port->dev, sg, priv->orig_nent, DMA_TO_DEVICE); dma_unmap_sg(port->dev, priv->sg_tx_p, priv->orig_nent, DMA_TO_DEVICE);
priv->tx_dma_use = 0; priv->tx_dma_use = 0;
priv->nent = 0; priv->nent = 0;
priv->orig_nent = 0; priv->orig_nent = 0;