linux-kernel - [PATCH] staging: greybus: uart: check return values during probe

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Message-ID: <20251115061646.160847-2-nirbhay.lkd@gmail.com>
Date: Sat, 15 Nov 2025 11:46:47 +0530
From: Nirbhay Sharma <nirbhay.lkd@...il.com>
To: David Lin <dtwlin@...il.com>,
	Johan Hovold <johan@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: greybus-dev@...ts.linaro.org,
	linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Shuah Khan <shuah@...nel.org>,
	david.hunter.linux@...il.com,
	linux-kernel-mentees@...ts.linuxfoundation.org,
	Nirbhay Sharma <nirbhay.lkd@...il.com>
Subject: [PATCH] staging: greybus: uart: check return values during probe

Check the return values of send_control() and send_line_coding() during
device initialization in gb_uart_probe(). If these operations fail, the
device will be left in an inconsistent state, so propagate the error to
properly fail the probe.

Both functions call gb_operation_sync() which can fail with errors such
as -ENOMEM, -ENODEV, or -ETIMEDOUT. Ignoring these errors means the TTY
device would be registered despite incomplete initialization.

Signed-off-by: Nirbhay Sharma <nirbhay.lkd@...il.com>
---
 drivers/staging/greybus/uart.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/greybus/uart.c b/drivers/staging/greybus/uart.c
index 10df5c37c83e..5cece0a6606f 100644
--- a/drivers/staging/greybus/uart.c
+++ b/drivers/staging/greybus/uart.c
@@ -879,14 +879,18 @@ static int gb_uart_probe(struct gbphy_device *gbphy_dev,
 	if (retval)
 		goto exit_put_port;
 
-	send_control(gb_tty, gb_tty->ctrlout);
+	retval = send_control(gb_tty, gb_tty->ctrlout);
+	if (retval)
+		goto exit_connection_disable;
 
 	/* initialize the uart to be 9600n81 */
 	gb_tty->line_coding.rate = cpu_to_le32(9600);
 	gb_tty->line_coding.format = GB_SERIAL_1_STOP_BITS;
 	gb_tty->line_coding.parity = GB_SERIAL_NO_PARITY;
 	gb_tty->line_coding.data_bits = 8;
-	send_line_coding(gb_tty);
+	retval = send_line_coding(gb_tty);
+	if (retval)
+		goto exit_connection_disable;
 
 	retval = gb_connection_enable(connection);
 	if (retval)
-- 
2.48.1