serial: pch_uart: Pass correct sg to dma_unmap_sg()

commit e8914b52e5b024e4af3d810a935fe0805eee8a36 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: e5f44f3fe68c ("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>

diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index a8b6759140dd70b2d0ebf969f784531a69ea209d..317067184bfa407c7cc862b634215b1835e8cbe6 100644 (file)
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -776,7 +776,7 @@ static void pch_dma_tx_complete(void *arg)
        }
        xmit->tail &= UART_XMIT_SIZE - 1;
        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->nent = 0;
        priv->orig_nent = 0;