From d4089a332883ad969700aac5dd4dd5f1c4fee825 Mon Sep 17 00:00:00 2001 From: Heikki Krogerus Date: Mon, 28 Apr 2014 15:59:56 +0300 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_dma.c | 17 ++++++++++++----- 1 file 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); -- 2.39.2