[PATCH 4.19 076/116] serial: max310x: unregister uart driver in case of failure and abort

[Greg Kroah-Hartman]

From: Atul Gopinathan <atulgopinathan@xxxxxxxxx>

[ Upstream commit 3890e3dea315f1a257d1b940a2a4e2fa16a7b095 ]

The macro "spi_register_driver" invokes the function
"__spi_register_driver()" which has a return type of int and can fail,
returning a negative value in such a case. This is currently ignored and
the init() function yields success even if the spi driver failed to
register.

Fix this by collecting the return value of "__spi_register_driver()" and
also unregister the uart driver in case of failure.

Cc: Jiri Slaby <jirislaby@xxxxxxxxxx>
Signed-off-by: Atul Gopinathan <atulgopinathan@xxxxxxxxx>
Link: https://lore.kernel.org/r/20210503115736.2104747-12-gregkh@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/tty/serial/max310x.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index 0c35c3c5e373..c1ab0dbda8a9 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -1480,10 +1480,12 @@ static int __init max310x_uart_init(void)
 		return ret;
 
 #ifdef CONFIG_SPI_MASTER
-	spi_register_driver(&max310x_spi_driver);
+	ret = spi_register_driver(&max310x_spi_driver);
+	if (ret)
+		uart_unregister_driver(&max310x_uart);
 #endif
 
-	return 0;
+	return ret;
 }
 module_init(max310x_uart_init);
 
-- 
2.30.2