linux-kernel - [PATCH v1 3/6] serial: port: Make ->iotype validation global in __uart_read

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Message-ID: <20250124161530.398361-4-andriy.shevchenko@linux.intel.com>
Date: Fri, 24 Jan 2025 18:10:48 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Guanbing Huang <albanhuang@...cent.com>,
	linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org
Cc: Jiri Slaby <jirislaby@...nel.org>
Subject: [PATCH v1 3/6] serial: port: Make ->iotype validation global in __uart_read_properties()

In order to make code robust against potential changes in the future
move ->iotype validation outside of switch in __uart_read_properties().
If any code will be added in between that might leave the ->iotype value
unknown the validation catches this up.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/tty/serial/serial_port.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/serial/serial_port.c b/drivers/tty/serial/serial_port.c
index 85285c56fabf..2fc48cd63f6c 100644
--- a/drivers/tty/serial/serial_port.c
+++ b/drivers/tty/serial/serial_port.c
@@ -229,14 +229,15 @@ static int __uart_read_properties(struct uart_port *port, bool use_defaults)
 			break;
 		default:
 			port->iotype = UPIO_UNKNOWN;
-			if (!use_defaults) {
-				dev_err(dev, "Unsupported reg-io-width (%u)\n", value);
-				return -EINVAL;
-			}
 			break;
 		}
 	}
 
+	if (!use_defaults && port->iotype == UPIO_UNKNOWN) {
+		dev_err(dev, "Unsupported reg-io-width (%u)\n", value);
+		return -EINVAL;
+	}
+
 	/* Read the address mapping base offset (default: no offset) */
 	ret = device_property_read_u32(dev, "reg-offset", &value);
 	if (ret)
-- 
2.43.0.rc1.1336.g36b5255a03ac