serial: sh-sci: Use correct device for DMA mapping with IOMMU
To function correctly in the presence of an IOMMU, the DMA buffers must
be managed using the DMA channel's device instead of the platform
device's device.
Make sure to free the DMA memory before releasing the channel, not
after.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index ea6ab61..9aa9720 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1370,9 +1370,9 @@
s->chan_rx = NULL;
s->cookie_rx[0] = s->cookie_rx[1] = -EINVAL;
- dma_release_channel(chan);
- dma_free_coherent(port->dev, s->buf_len_rx * 2,
+ dma_free_coherent(chan->device->dev, s->buf_len_rx * 2,
sg_virt(&s->sg_rx[0]), sg_dma_address(&s->sg_rx[0]));
+ dma_release_channel(chan);
if (enable_pio)
sci_start_rx(port);
}
@@ -1523,7 +1523,7 @@
return;
}
- dma_sync_sg_for_device(port->dev, sg, 1, DMA_TO_DEVICE);
+ dma_sync_sg_for_device(chan->device->dev, sg, 1, DMA_TO_DEVICE);
spin_lock_irq(&port->lock);
s->desc_tx = desc;
@@ -1705,7 +1705,8 @@
sg_set_page(&s->sg_tx, virt_to_page(port->state->xmit.buf),
UART_XMIT_SIZE,
(uintptr_t)port->state->xmit.buf & ~PAGE_MASK);
- nent = dma_map_sg(port->dev, &s->sg_tx, 1, DMA_TO_DEVICE);
+ nent = dma_map_sg(chan->device->dev, &s->sg_tx, 1,
+ DMA_TO_DEVICE);
if (!nent) {
dev_warn(port->dev, "Failed mapping Tx DMA descriptor\n");
dma_release_channel(chan);
@@ -1737,8 +1738,9 @@
s->chan_rx = chan;
s->buf_len_rx = 2 * max(16, (int)port->fifosize);
- buf[0] = dma_alloc_coherent(port->dev, s->buf_len_rx * 2,
- &dma[0], GFP_KERNEL);
+ buf[0] = dma_alloc_coherent(chan->device->dev,
+ s->buf_len_rx * 2, &dma[0],
+ GFP_KERNEL);
if (!buf[0]) {
dev_warn(port->dev,