linux-kernel - [PATCH v2 01/19] tty: serial: samsung: fix tx_empty() to return TIOCSER

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Date: Fri, 19 Jan 2024 10:45:08 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: gregkh@...uxfoundation.org,
	jirislaby@...nel.org,
	robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org
Cc: alim.akhtar@...sung.com,
	linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	andre.draszik@...aro.org,
	kernel-team@...roid.com,
	peter.griffin@...aro.org,
	semen.protsenko@...aro.org,
	willmcvicker@...gle.com,
	Tudor Ambarus <tudor.ambarus@...aro.org>
Subject: [PATCH v2 01/19] tty: serial: samsung: fix tx_empty() to return TIOCSER_TEMT

The core expects for tx_empty() either TIOCSER_TEMT when the tx is
empty or 0 otherwise. s3c24xx_serial_txempty_nofifo() might return
0x4, and at least uart_get_lsr_info() tries to clear exactly
TIOCSER_TEMT (BIT(1)). Fix tx_empty() to return TIOCSER_TEMT.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
---
 drivers/tty/serial/samsung_tty.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index 71d17d804fda..6fdb32b83346 100644
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -987,11 +987,10 @@ static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
 		if ((ufstat & info->tx_fifomask) != 0 ||
 		    (ufstat & info->tx_fifofull))
 			return 0;
-
-		return 1;
+		return TIOCSER_TEMT;
 	}
 
-	return s3c24xx_serial_txempty_nofifo(port);
+	return s3c24xx_serial_txempty_nofifo(port) ? TIOCSER_TEMT : 0;
 }
 
 /* no modem control lines */
-- 
2.43.0.429.g432eaa2c6b-goog