This is a note to let you know that I've just added the patch titled
serial: 8250: Adjust the timeout for FIFO mode
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
serial-8250-adjust-the-timeout-for-fifo-mode.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit cce0113666701a652e32e47bdeee4a2892b82a37
Author: John Ogness <john.ogness@xxxxxxxxxxxxx>
Date: Tue Jan 7 22:32:57 2025 +0106
serial: 8250: Adjust the timeout for FIFO mode
[ Upstream commit d91f98be26510f5f81ec66425bb0306d1ccd571a ]
After a console has written a record into UART_TX, it uses
wait_for_xmitr() to wait until the data has been sent out before
returning. However, wait_for_xmitr() will timeout after 10ms,
regardless if the data has been transmitted or not.
For single bytes, this timeout is sufficient even at very slow
baud rates, such as 1200bps. However, when FIFO mode is used,
there may be 64 bytes pushed into the FIFO at once. At a baud
rate of 115200bps, the 10ms timeout is still sufficient. But
when using lower baud rates (such as 57600bps), the timeout
is _not_ sufficient. This causes longer lines to be cut off,
resulting in lost and horribly misformatted output on the
console.
When using FIFO mode, take the number of bytes into account to
determine an appropriate maximum timeout. Increasing the timeout
does not affect performance since ideally the timeout never
occurs.
Fixes: 8f3631f0f6eb ("serial/8250: Use fifo in 8250 console driver")
Signed-off-by: John Ogness <john.ogness@xxxxxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Reviewed-by: Wander Lairson Costa <wander@xxxxxxxxxx>
Reviewed-by: Petr Mladek <pmladek@xxxxxxxx>
Link: https://lore.kernel.org/r/20250107212702.169493-2-john.ogness@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index c744feabd7cdd..fb1ea2f448910 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -2091,7 +2091,8 @@ static void serial8250_break_ctl(struct uart_port *port, int break_state)
serial8250_rpm_put(up);
}
-static void wait_for_lsr(struct uart_8250_port *up, int bits)
+/* Returns true if @bits were set, false on timeout */
+static bool wait_for_lsr(struct uart_8250_port *up, int bits)
{
unsigned int status, tmout = 10000;
@@ -2106,11 +2107,11 @@ static void wait_for_lsr(struct uart_8250_port *up, int bits)
udelay(1);
touch_nmi_watchdog();
}
+
+ return (tmout != 0);
}
-/*
- * Wait for transmitter & holding register to empty
- */
+/* Wait for transmitter and holding register to empty with timeout */
static void wait_for_xmitr(struct uart_8250_port *up, int bits)
{
unsigned int tmout;
@@ -3349,6 +3350,16 @@ static void serial8250_console_restore(struct uart_8250_port *up)
serial8250_out_MCR(up, up->mcr | UART_MCR_DTR | UART_MCR_RTS);
}
+static void fifo_wait_for_lsr(struct uart_8250_port *up, unsigned int count)
+{
+ unsigned int i;
+
+ for (i = 0; i < count; i++) {
+ if (wait_for_lsr(up, UART_LSR_THRE))
+ return;
+ }
+}
+
/*
* Print a string to the serial port using the device FIFO
*
@@ -3358,13 +3369,15 @@ static void serial8250_console_restore(struct uart_8250_port *up)
static void serial8250_console_fifo_write(struct uart_8250_port *up,
const char *s, unsigned int count)
{
- int i;
const char *end = s + count;
unsigned int fifosize = up->tx_loadsz;
+ unsigned int tx_count = 0;
bool cr_sent = false;
+ unsigned int i;
while (s != end) {
- wait_for_lsr(up, UART_LSR_THRE);
+ /* Allow timeout for each byte of a possibly full FIFO */
+ fifo_wait_for_lsr(up, fifosize);
for (i = 0; i < fifosize && s != end; ++i) {
if (*s == '\n' && !cr_sent) {
@@ -3375,7 +3388,14 @@ static void serial8250_console_fifo_write(struct uart_8250_port *up,
cr_sent = false;
}
}
+ tx_count = i;
}
+
+ /*
+ * Allow timeout for each byte written since the caller will only wait
+ * for UART_LSR_BOTH_EMPTY using the timeout of a single character
+ */
+ fifo_wait_for_lsr(up, tx_count);
}
/*
