| From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.16 068/217] mxser: increase buf_overrun if tty_insert_flip_char() fails | Date | Mon, 17 Jan 2022 21:17:11 -0500 |
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From: Jiri Slaby <jslaby@suse.cz>
[ Upstream commit eb68ac0462bffc2ceb63b3a76737d6c9f186e6de ]
mxser doesn't increase port->icount.buf_overrun at all. Do so if overrun happens, so that it can be read from the stats.
Signed-off-by: Jiri Slaby <jslaby@suse.cz> Link: https://lore.kernel.org/r/20211118073125.12283-17-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/tty/mxser.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c index 3b5d193b7f245..39458b42df7b0 100644 --- a/drivers/tty/mxser.c +++ b/drivers/tty/mxser.c @@ -1536,7 +1536,8 @@ static bool mxser_receive_chars_new(struct tty_struct *tty, while (gdl--) { u8 ch = inb(port->ioaddr + UART_RX); - tty_insert_flip_char(&port->port, ch, 0); + if (!tty_insert_flip_char(&port->port, ch, 0)) + port->icount.buf_overrun++; } return true; @@ -1582,8 +1583,10 @@ static u8 mxser_receive_chars_old(struct tty_struct *tty, port->icount.overrun++; } } - if (!tty_insert_flip_char(&port->port, ch, flag)) + if (!tty_insert_flip_char(&port->port, ch, flag)) { + port->icount.buf_overrun++; break; + } } if (hwid) -- 2.34.1
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