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SubjectRe: [PATCH serial v2] sc16is7xx: missing unregister/delete driver on error in sc16is7xx_init()
On Sat, Mar 09, 2019 at 10:50:37AM +0800, Mao Wenan wrote:
> Add the missing uart_unregister_driver() and i2c_del_driver() before return
> from sc16is7xx_init() in the error handling case.
>
> Reviewed-by: Vladimir Zapolskiy <vz@mleia.com>
> Signed-off-by: Mao Wenan <maowenan@huawei.com>
> ---
> v1->v2: fix compile warning if CONFIG_SERIAL_SC16IS7XX_SPI is not exist.
> drivers/tty/serial/sc16is7xx.c | 14 ++++++++++++--
> 1 file changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
> index 268098681856..b9e5941ce767 100644
> --- a/drivers/tty/serial/sc16is7xx.c
> +++ b/drivers/tty/serial/sc16is7xx.c
> @@ -1509,7 +1509,7 @@ static int __init sc16is7xx_init(void)
> ret = i2c_add_driver(&sc16is7xx_i2c_uart_driver);
> if (ret < 0) {
> pr_err("failed to init sc16is7xx i2c --> %d\n", ret);
> - return ret;
> + goto err_i2c;
> }
> #endif
>
> @@ -1517,10 +1517,20 @@ static int __init sc16is7xx_init(void)
> ret = spi_register_driver(&sc16is7xx_spi_uart_driver);
> if (ret < 0) {
> pr_err("failed to init sc16is7xx spi --> %d\n", ret);
> - return ret;
> + goto err_spi;
> }
> #endif
> return ret;
> +
> +#ifdef CONFIG_SERIAL_SC16IS7XX_SPI
> +err_spi:
> +#endif
> +#ifdef CONFIG_SERIAL_SC16IS7XX_I2C
> + i2c_del_driver(&sc16is7xx_i2c_uart_driver);
> +err_i2c:
> +#endif
> + uart_unregister_driver(&sc16is7xx_uart);
> + return ret;

This is quite ulgy. Why not create two functions:

diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 635178cf3eed..9986cb2479ad 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -1491,6 +1491,21 @@ static struct i2c_driver sc16is7xx_i2c_uart_driver = {
.id_table = sc16is7xx_i2c_id_table,
};

+static int __init register_sc16is7xx_i2c(void)
+{
+ return i2c_add_driver(&sc16is7xx_i2c_uart_driver);
+}
+
+static void __exit del_sc16is7xx_i2c(void)
+{
+ i2c_del_driver(&sc16is7xx_i2c_uart_driver);
+}
+
+#else
+
+static int __init register_sc16is7xx_i2c(void) { return 0; }
+static void __exit del_sc16is7xx_i2c(void) {}
+
#endif

static int __init sc16is7xx_init(void)
Then you can remove all the ifdefs.

regards,
dan carpenter

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