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authorHeikki Krogerus <heikki.krogerus@linux.intel.com>2014-04-28 15:59:56 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-28 13:07:27 -0700
commitd4089a332883ad969700aac5dd4dd5f1c4fee825 (patch)
tree0dbbb4dec60fbbd491ae8ee31dcbce95e1f3ab50 /drivers/tty/serial/8250
parent06aa82e498c144c7784a6f3d3b55458b272d6146 (diff)
downloadlinux-d4089a332883ad969700aac5dd4dd5f1c4fee825.tar.bz2
serial: 8250_dma: check the result of TX buffer mapping
Using dma_mapping_error() to make sure the mapping did not fail. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/8250')
-rw-r--r--drivers/tty/serial/8250/8250_dma.c17
1 files changed, 12 insertions, 5 deletions
diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c
index ab9096dc3849..148ffe4c232f 100644
--- a/drivers/tty/serial/8250/8250_dma.c
+++ b/drivers/tty/serial/8250/8250_dma.c
@@ -192,21 +192,28 @@ int serial8250_request_dma(struct uart_8250_port *p)
dma->rx_buf = dma_alloc_coherent(dma->rxchan->device->dev, dma->rx_size,
&dma->rx_addr, GFP_KERNEL);
- if (!dma->rx_buf) {
- dma_release_channel(dma->rxchan);
- dma_release_channel(dma->txchan);
- return -ENOMEM;
- }
+ if (!dma->rx_buf)
+ goto err;
/* TX buffer */
dma->tx_addr = dma_map_single(dma->txchan->device->dev,
p->port.state->xmit.buf,
UART_XMIT_SIZE,
DMA_TO_DEVICE);
+ if (dma_mapping_error(dma->txchan->device->dev, dma->tx_addr)) {
+ dma_free_coherent(dma->rxchan->device->dev, dma->rx_size,
+ dma->rx_buf, dma->rx_addr);
+ goto err;
+ }
dev_dbg_ratelimited(p->port.dev, "got both dma channels\n");
return 0;
+err:
+ dma_release_channel(dma->rxchan);
+ dma_release_channel(dma->txchan);
+
+ return -ENOMEM;
}
EXPORT_SYMBOL_GPL(serial8250_request_dma);