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tty: serial: samsung: fix tx_empty() to return TIOCSER_TEMT

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[ Upstream commit 314c2b3992 ]

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: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Link: https://lore.kernel.org/r/20240119104526.1221243-2-tudor.ambarus@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Tudor Ambarus 2024-01-19 10:45:08 +00:00 committed by Sasha Levin
parent 1eb9ab1f9f
commit 1639e9c7a3
1 changed files with 2 additions and 3 deletions
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5
drivers/tty/serial/samsung_tty.c
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@ -922,11 +922,10 @@ 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 */