linux-kernel - [PATCH] tty: serial: add missing pci_dev

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Date:   Mon, 14 Feb 2022 18:01:12 -0800
From:   Qing Wang <wangqing@...o.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Wang Qing <wangqing@...o.com>
Subject: [PATCH] tty: serial: add missing pci_dev_put() before return

From: Wang Qing <wangqing@...o.com>

pci_get_slot() increases its reference count, the caller must
decrement the reference count by calling pci_dev_put()

Signed-off-by: Wang Qing <wangqing@...o.com>
---
 drivers/tty/serial/pch_uart.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index f0351e6..da5a276
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -723,7 +723,7 @@ static void pch_request_dma(struct uart_port *port)
 	if (!chan) {
 		dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Tx)\n",
 			__func__);
-		return;
+		goto out;
 	}
 	priv->chan_tx = chan;
 
@@ -739,13 +739,16 @@ static void pch_request_dma(struct uart_port *port)
 			__func__);
 		dma_release_channel(priv->chan_tx);
 		priv->chan_tx = NULL;
-		return;
+		goto out;
 	}
 
 	/* Get Consistent memory for DMA */
 	priv->rx_buf_virt = dma_alloc_coherent(port->dev, port->fifosize,
 				    &priv->rx_buf_dma, GFP_KERNEL);
 	priv->chan_rx = chan;
+
+out:
+	pci_dev_put(dma_dev);
 }
 
 static void pch_dma_rx_complete(void *arg)
-- 
2.7.4