[PATCH 3.15 113/122] serial: Fix IGNBRK handling

From: Greg Kroah-Hartman
Date: Mon Jul 07 2014 - 20:51:16 EST

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3.15-stable review patch. If anyone has any objections, please let me know.

------------------

From: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>

commit ef8b9ddcb45fa3b1e11acd72be2398001e807d14 upstream.

If IGNBRK is set without either BRKINT or PARMRK set, some uart
drivers send a 0x00 byte for BREAK without the TTYBREAK flag to the
line discipline, when it should send either nothing or the TTYBREAK flag
set. This happens because the read_status_mask masks out the BI
condition, which uart_insert_char() then interprets as a normal 0x00 byte.

SUS v3 is clear regarding the meaning of IGNBRK; Section 11.2.2, General
Terminal Interface - Input Modes, states:
"If IGNBRK is set, a break condition detected on input shall be ignored;
that is, not put on the input queue and therefore not read by any
process."

Fix read_status_mask to include the BI bit if IGNBRK is set; the
lsr status retains the BI bit if a BREAK is recv'd, which is
subsequently ignored in uart_insert_char() when masked with the
ignore_status_mask.

Affected drivers:
8250 - all
serial_txx9
mfd
amba-pl010
amba-pl011
atmel_serial
bfin_uart
dz
ip22zilog
max310x
mxs-auart
netx-serial
pnx8xxx_uart
pxa
sb1250-duart
sccnxp
serial_ks8695
sirfsoc_uart
st-asc
vr41xx_siu
zs
sunzilog
fsl_lpuart
sunsab
ucc_uart
bcm63xx_uart
sunsu
efm32-uart
pmac_zilog
mpsc
msm_serial
m32r_sio

Unaffected drivers:
omap-serial
rp2
sa1100
imx
icom

Annotated for fixes:
altera_uart
mcf

Drivers without break detection:
21285
xilinx-uartps
altera_jtaguart
apbuart
arc-uart
clps711x
max3100
uartlite
msm_serial_hs
nwpserial
lantiq
vt8500_serial

Unknown:
samsung
mpc52xx_uart
bfin_sport_uart
cpm_uart/core

Fixes: Bugzilla #71651, '8250_core.c incorrectly handles IGNBRK flag'
Reported-by: Ivan <athlon_@xxxxxxx>
Signed-off-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/tty/serial/8250/8250_core.c | 2 +-
drivers/tty/serial/altera_uart.c | 6 ++++++
drivers/tty/serial/amba-pl010.c | 2 +-
drivers/tty/serial/amba-pl011.c | 2 +-
drivers/tty/serial/atmel_serial.c | 2 +-
drivers/tty/serial/bcm63xx_uart.c | 2 +-
drivers/tty/serial/bfin_uart.c | 2 +-
drivers/tty/serial/dz.c | 2 +-
drivers/tty/serial/efm32-uart.c | 2 +-
drivers/tty/serial/fsl_lpuart.c | 2 +-
drivers/tty/serial/ip22zilog.c | 2 +-
drivers/tty/serial/m32r_sio.c | 2 +-
drivers/tty/serial/max310x.c | 2 +-
drivers/tty/serial/mcf.c | 6 ++++++
drivers/tty/serial/mfd.c | 2 +-
drivers/tty/serial/mpsc.c | 2 +-
drivers/tty/serial/msm_serial.c | 2 +-
drivers/tty/serial/mxs-auart.c | 2 +-
drivers/tty/serial/netx-serial.c | 2 +-
drivers/tty/serial/pmac_zilog.c | 2 +-
drivers/tty/serial/pnx8xxx_uart.c | 2 +-
drivers/tty/serial/pxa.c | 2 +-
drivers/tty/serial/sb1250-duart.c | 2 +-
drivers/tty/serial/sccnxp.c | 2 +-
drivers/tty/serial/serial_ks8695.c | 2 +-
drivers/tty/serial/serial_txx9.c | 2 +-
drivers/tty/serial/sirfsoc_uart.c | 2 +-
drivers/tty/serial/st-asc.c | 2 +-
drivers/tty/serial/sunsab.c | 2 +-
drivers/tty/serial/sunsu.c | 2 +-
drivers/tty/serial/sunzilog.c | 2 +-
drivers/tty/serial/ucc_uart.c | 2 +-
drivers/tty/serial/vr41xx_siu.c | 2 +-
drivers/tty/serial/zs.c | 2 +-
34 files changed, 44 insertions(+), 32 deletions(-)

--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -2360,7 +2360,7 @@ serial8250_do_set_termios(struct uart_po
port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
if (termios->c_iflag & INPCK)
port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
port->read_status_mask |= UART_LSR_BI;

/*
--- a/drivers/tty/serial/altera_uart.c
+++ b/drivers/tty/serial/altera_uart.c
@@ -185,6 +185,12 @@ static void altera_uart_set_termios(stru
uart_update_timeout(port, termios->c_cflag, baud);
altera_uart_writel(port, baudclk, ALTERA_UART_DIVISOR_REG);
spin_unlock_irqrestore(&port->lock, flags);
+
+ /*
+ * FIXME: port->read_status_mask and port->ignore_status_mask
+ * need to be initialized based on termios settings for
+ * INPCK, IGNBRK, IGNPAR, PARMRK, BRKINT
+ */
}

static void altera_uart_rx_chars(struct altera_uart *pp)
--- a/drivers/tty/serial/amba-pl010.c
+++ b/drivers/tty/serial/amba-pl010.c
@@ -420,7 +420,7 @@ pl010_set_termios(struct uart_port *port
uap->port.read_status_mask = UART01x_RSR_OE;
if (termios->c_iflag & INPCK)
uap->port.read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
uap->port.read_status_mask |= UART01x_RSR_BE;

/*
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -1744,7 +1744,7 @@ pl011_set_termios(struct uart_port *port
port->read_status_mask = UART011_DR_OE | 255;
if (termios->c_iflag & INPCK)
port->read_status_mask |= UART011_DR_FE | UART011_DR_PE;
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
port->read_status_mask |= UART011_DR_BE;

/*
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -1784,7 +1784,7 @@ static void atmel_set_termios(struct uar
port->read_status_mask = ATMEL_US_OVRE;
if (termios->c_iflag & INPCK)
port->read_status_mask |= (ATMEL_US_FRAME | ATMEL_US_PARE);
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
port->read_status_mask |= ATMEL_US_RXBRK;

if (atmel_use_pdc_rx(port))
--- a/drivers/tty/serial/bcm63xx_uart.c
+++ b/drivers/tty/serial/bcm63xx_uart.c
@@ -567,7 +567,7 @@ static void bcm_uart_set_termios(struct
port->read_status_mask |= UART_FIFO_FRAMEERR_MASK;
port->read_status_mask |= UART_FIFO_PARERR_MASK;
}
- if (new->c_iflag & (BRKINT))
+ if (new->c_iflag & (IGNBRK | BRKINT))
port->read_status_mask |= UART_FIFO_BRKDET_MASK;

port->ignore_status_mask = 0;
--- a/drivers/tty/serial/bfin_uart.c
+++ b/drivers/tty/serial/bfin_uart.c
@@ -833,7 +833,7 @@ bfin_serial_set_termios(struct uart_port
port->read_status_mask = OE;
if (termios->c_iflag & INPCK)
port->read_status_mask |= (FE | PE);
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
port->read_status_mask |= BI;

/*
--- a/drivers/tty/serial/dz.c
+++ b/drivers/tty/serial/dz.c
@@ -625,7 +625,7 @@ static void dz_set_termios(struct uart_p
dport->port.read_status_mask = DZ_OERR;
if (termios->c_iflag & INPCK)
dport->port.read_status_mask |= DZ_FERR | DZ_PERR;
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
dport->port.read_status_mask |= DZ_BREAK;

/* characters to ignore */
--- a/drivers/tty/serial/efm32-uart.c
+++ b/drivers/tty/serial/efm32-uart.c
@@ -407,7 +407,7 @@ static void efm32_uart_set_termios(struc
if (new->c_iflag & INPCK)
port->read_status_mask |=
UARTn_RXDATAX_FERR | UARTn_RXDATAX_PERR;
- if (new->c_iflag & (BRKINT | PARMRK))
+ if (new->c_iflag & (IGNBRK | BRKINT | PARMRK))
port->read_status_mask |= SW_UARTn_RXDATAX_BERR;

port->ignore_status_mask = 0;
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -902,7 +902,7 @@ lpuart_set_termios(struct uart_port *por
sport->port.read_status_mask = 0;
if (termios->c_iflag & INPCK)
sport->port.read_status_mask |= (UARTSR1_FE | UARTSR1_PE);
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
sport->port.read_status_mask |= UARTSR1_FE;

/* characters to ignore */
--- a/drivers/tty/serial/ip22zilog.c
+++ b/drivers/tty/serial/ip22zilog.c
@@ -850,7 +850,7 @@ ip22zilog_convert_to_zs(struct uart_ip22
up->port.read_status_mask = Rx_OVR;
if (iflag & INPCK)
up->port.read_status_mask |= CRC_ERR | PAR_ERR;
- if (iflag & (BRKINT | PARMRK))
+ if (iflag & (IGNBRK | BRKINT | PARMRK))
up->port.read_status_mask |= BRK_ABRT;

up->port.ignore_status_mask = 0;
--- a/drivers/tty/serial/m32r_sio.c
+++ b/drivers/tty/serial/m32r_sio.c
@@ -737,7 +737,7 @@ static void m32r_sio_set_termios(struct
up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
if (termios->c_iflag & INPCK)
up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
up->port.read_status_mask |= UART_LSR_BI;

/*
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -835,7 +835,7 @@ static void max310x_set_termios(struct u
if (termios->c_iflag & INPCK)
port->read_status_mask |= MAX310X_LSR_RXPAR_BIT |
MAX310X_LSR_FRERR_BIT;
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
port->read_status_mask |= MAX310X_LSR_RXBRK_BIT;

/* Set status ignore mask */
--- a/drivers/tty/serial/mcf.c
+++ b/drivers/tty/serial/mcf.c
@@ -248,6 +248,12 @@ static void mcf_set_termios(struct uart_
mr1 |= MCFUART_MR1_PARITYNONE;
}

+ /*
+ * FIXME: port->read_status_mask and port->ignore_status_mask
+ * need to be initialized based on termios settings for
+ * INPCK, IGNBRK, IGNPAR, PARMRK, BRKINT
+ */
+
if (termios->c_cflag & CSTOPB)
mr2 |= MCFUART_MR2_STOP2;
else
--- a/drivers/tty/serial/mfd.c
+++ b/drivers/tty/serial/mfd.c
@@ -977,7 +977,7 @@ serial_hsu_set_termios(struct uart_port
up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
if (termios->c_iflag & INPCK)
up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
up->port.read_status_mask |= UART_LSR_BI;

/* Characters to ignore */
--- a/drivers/tty/serial/mpsc.c
+++ b/drivers/tty/serial/mpsc.c
@@ -1458,7 +1458,7 @@ static void mpsc_set_termios(struct uart
pi->port.read_status_mask |= SDMA_DESC_CMDSTAT_PE
| SDMA_DESC_CMDSTAT_FR;

- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
pi->port.read_status_mask |= SDMA_DESC_CMDSTAT_BR;

/* Characters/events to ignore */
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -583,7 +583,7 @@ static void msm_set_termios(struct uart_
port->read_status_mask = 0;
if (termios->c_iflag & INPCK)
port->read_status_mask |= UART_SR_PAR_FRAME_ERR;
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
port->read_status_mask |= UART_SR_RX_BREAK;

uart_update_timeout(port, termios->c_cflag, baud);
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -604,7 +604,7 @@ static void mxs_auart_settermios(struct

if (termios->c_iflag & INPCK)
u->read_status_mask |= AUART_STAT_PERR;
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
u->read_status_mask |= AUART_STAT_BERR;

/*
--- a/drivers/tty/serial/netx-serial.c
+++ b/drivers/tty/serial/netx-serial.c
@@ -419,7 +419,7 @@ netx_set_termios(struct uart_port *port,
}

port->read_status_mask = 0;
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
port->read_status_mask |= SR_BE;
if (termios->c_iflag & INPCK)
port->read_status_mask |= SR_PE | SR_FE;
--- a/drivers/tty/serial/pmac_zilog.c
+++ b/drivers/tty/serial/pmac_zilog.c
@@ -1092,7 +1092,7 @@ static void pmz_convert_to_zs(struct uar
uap->port.read_status_mask = Rx_OVR;
if (iflag & INPCK)
uap->port.read_status_mask |= CRC_ERR | PAR_ERR;
- if (iflag & (BRKINT | PARMRK))
+ if (iflag & (IGNBRK | BRKINT | PARMRK))
uap->port.read_status_mask |= BRK_ABRT;

uap->port.ignore_status_mask = 0;
--- a/drivers/tty/serial/pnx8xxx_uart.c
+++ b/drivers/tty/serial/pnx8xxx_uart.c
@@ -477,7 +477,7 @@ pnx8xxx_set_termios(struct uart_port *po
sport->port.read_status_mask |=
FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) |
FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR);
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
sport->port.read_status_mask |=
ISTAT_TO_SM(PNX8XXX_UART_INT_BREAK);

--- a/drivers/tty/serial/pxa.c
+++ b/drivers/tty/serial/pxa.c
@@ -492,7 +492,7 @@ serial_pxa_set_termios(struct uart_port
up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
if (termios->c_iflag & INPCK)
up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
up->port.read_status_mask |= UART_LSR_BI;

/*
--- a/drivers/tty/serial/sb1250-duart.c
+++ b/drivers/tty/serial/sb1250-duart.c
@@ -596,7 +596,7 @@ static void sbd_set_termios(struct uart_
if (termios->c_iflag & INPCK)
uport->read_status_mask |= M_DUART_FRM_ERR |
M_DUART_PARITY_ERR;
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
uport->read_status_mask |= M_DUART_RCVD_BRK;

uport->ignore_status_mask = 0;
--- a/drivers/tty/serial/sccnxp.c
+++ b/drivers/tty/serial/sccnxp.c
@@ -667,7 +667,7 @@ static void sccnxp_set_termios(struct ua
port->read_status_mask = SR_OVR;
if (termios->c_iflag & INPCK)
port->read_status_mask |= SR_PE | SR_FE;
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
port->read_status_mask |= SR_BRK;

/* Set status ignore mask */
--- a/drivers/tty/serial/serial_ks8695.c
+++ b/drivers/tty/serial/serial_ks8695.c
@@ -437,7 +437,7 @@ static void ks8695uart_set_termios(struc
port->read_status_mask = URLS_URROE;
if (termios->c_iflag & INPCK)
port->read_status_mask |= (URLS_URFE | URLS_URPE);
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
port->read_status_mask |= URLS_URBI;

/*
--- a/drivers/tty/serial/serial_txx9.c
+++ b/drivers/tty/serial/serial_txx9.c
@@ -702,7 +702,7 @@ serial_txx9_set_termios(struct uart_port
TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS;
if (termios->c_iflag & INPCK)
up->port.read_status_mask |= TXX9_SIDISR_UFER | TXX9_SIDISR_UPER;
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
up->port.read_status_mask |= TXX9_SIDISR_UBRK;

/*
--- a/drivers/tty/serial/sirfsoc_uart.c
+++ b/drivers/tty/serial/sirfsoc_uart.c
@@ -907,7 +907,7 @@ static void sirfsoc_uart_set_termios(str
if (termios->c_iflag & INPCK)
port->read_status_mask |= uint_en->sirfsoc_frm_err_en;
}
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
port->read_status_mask |= uint_en->sirfsoc_rxd_brk_en;
if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) {
if (termios->c_iflag & IGNPAR)
--- a/drivers/tty/serial/st-asc.c
+++ b/drivers/tty/serial/st-asc.c
@@ -547,7 +547,7 @@ static void asc_set_termios(struct uart_
ascport->port.read_status_mask = ASC_RXBUF_DUMMY_OE;
if (termios->c_iflag & INPCK)
ascport->port.read_status_mask |= ASC_RXBUF_FE | ASC_RXBUF_PE;
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
ascport->port.read_status_mask |= ASC_RXBUF_DUMMY_BE;

/*
--- a/drivers/tty/serial/sunsab.c
+++ b/drivers/tty/serial/sunsab.c
@@ -719,7 +719,7 @@ static void sunsab_convert_to_sab(struct
if (iflag & INPCK)
up->port.read_status_mask |= (SAB82532_ISR0_PERR |
SAB82532_ISR0_FERR);
- if (iflag & (BRKINT | PARMRK))
+ if (iflag & (IGNBRK | BRKINT | PARMRK))
up->port.read_status_mask |= (SAB82532_ISR1_BRK << 8);

/*
--- a/drivers/tty/serial/sunsu.c
+++ b/drivers/tty/serial/sunsu.c
@@ -834,7 +834,7 @@ sunsu_change_speed(struct uart_port *por
up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
if (iflag & INPCK)
up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
- if (iflag & (BRKINT | PARMRK))
+ if (iflag & (IGNBRK | BRKINT | PARMRK))
up->port.read_status_mask |= UART_LSR_BI;

/*
--- a/drivers/tty/serial/sunzilog.c
+++ b/drivers/tty/serial/sunzilog.c
@@ -915,7 +915,7 @@ sunzilog_convert_to_zs(struct uart_sunzi
up->port.read_status_mask = Rx_OVR;
if (iflag & INPCK)
up->port.read_status_mask |= CRC_ERR | PAR_ERR;
- if (iflag & (BRKINT | PARMRK))
+ if (iflag & (IGNBRK | BRKINT | PARMRK))
up->port.read_status_mask |= BRK_ABRT;

up->port.ignore_status_mask = 0;
--- a/drivers/tty/serial/ucc_uart.c
+++ b/drivers/tty/serial/ucc_uart.c
@@ -936,7 +936,7 @@ static void qe_uart_set_termios(struct u
port->read_status_mask = BD_SC_EMPTY | BD_SC_OV;
if (termios->c_iflag & INPCK)
port->read_status_mask |= BD_SC_FR | BD_SC_PR;
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
port->read_status_mask |= BD_SC_BR;

/*
--- a/drivers/tty/serial/vr41xx_siu.c
+++ b/drivers/tty/serial/vr41xx_siu.c
@@ -559,7 +559,7 @@ static void siu_set_termios(struct uart_
port->read_status_mask = UART_LSR_THRE | UART_LSR_OE | UART_LSR_DR;
if (c_iflag & INPCK)
port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
- if (c_iflag & (BRKINT | PARMRK))
+ if (c_iflag & (IGNBRK | BRKINT | PARMRK))
port->read_status_mask |= UART_LSR_BI;

port->ignore_status_mask = 0;
--- a/drivers/tty/serial/zs.c
+++ b/drivers/tty/serial/zs.c
@@ -923,7 +923,7 @@ static void zs_set_termios(struct uart_p
uport->read_status_mask = Rx_OVR;
if (termios->c_iflag & INPCK)
uport->read_status_mask |= FRM_ERR | PAR_ERR;
- if (termios->c_iflag & (BRKINT | PARMRK))
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
uport->read_status_mask |= Rx_BRK;

uport->ignore_status_mask = 0;

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