serial: sprd: Fix DMA buffer leak issue

Release DMA buffer when _probe() returns failure to avoid memory leak.

Fixes: f4487db58eb7 ("serial: sprd: Add DMA mode support")
Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230725064053.235448-2-chunyan.zhang@unisoc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c
index efca715..f328fa5 100644 (file)
--- a/drivers/tty/serial/sprd_serial.c
+++ b/drivers/tty/serial/sprd_serial.c
@@ -364,7 +364,7 @@ static void sprd_rx_free_buf(struct sprd_uart_port *sp)
        if (sp->rx_dma.virt)
                dma_free_coherent(sp->port.dev, SPRD_UART_RX_SIZE,
                                  sp->rx_dma.virt, sp->rx_dma.phys_addr);
-
+       sp->rx_dma.virt = NULL;
 }
 
 static int sprd_rx_dma_config(struct uart_port *port, u32 burst)
@@ -1203,7 +1203,7 @@ static int sprd_probe(struct platform_device *pdev)
                ret = uart_register_driver(&sprd_uart_driver);
                if (ret < 0) {
                        pr_err("Failed to register SPRD-UART driver\n");
-                       return ret;
+                       goto free_rx_buf;
                }
        }
 
@@ -1222,6 +1222,7 @@ clean_port:
        sprd_port[index] = NULL;
        if (--sprd_ports_num == 0)
                uart_unregister_driver(&sprd_uart_driver);
+free_rx_buf:
        sprd_rx_free_buf(sport);
        return ret;
 }