This is a note to let you know that I've just added the patch titled serial: Fix IGNBRK handling to the 3.14-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-fix-ignbrk-handling.patch and it can be found in the queue-3.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From ef8b9ddcb45fa3b1e11acd72be2398001e807d14 Mon Sep 17 00:00:00 2001 From: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx> Date: Mon, 16 Jun 2014 08:10:41 -0400 Subject: serial: Fix IGNBRK handling 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 @@ -2356,7 +2356,7 @@ 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 @@ -1811,7 +1811,7 @@ 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 @@ -565,7 +565,7 @@ 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 @@ -496,7 +496,7 @@ 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 @@ -842,7 +842,7 @@ 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 @@ -570,7 +570,7 @@ 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 @@ -908,7 +908,7 @@ 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; Patches currently in stable-queue which might be from peter@xxxxxxxxxxxxxxxxxx are queue-3.14/serial-fix-ignbrk-handling.patch queue-3.14/tty-correct-inpck-handling.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html