From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: linux-serial@vger.kernel.org
Subject: [PATCH] serial: 8250_dma: check the result of TX buffer mapping
Date: Mon, 28 Apr 2014 15:59:56 +0300 [thread overview]
Message-ID: <1398689996-17182-1-git-send-email-heikki.krogerus@linux.intel.com> (raw)
Using dma_mapping_error() to make sure the mapping did not
fail.
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
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 ab9096d..148ffe4 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);
--
2.0.0.rc0
reply other threads:[~2014-04-28 13:00 UTC|newest]
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