Dan Carpenter noticed a missing set of parentheses around a multiple field addition. https://lkml.org/lkml/2013/1/27/166 His original commit message: There is a kind of precedence problem here, but it doesn't affect how the code works because ->serial_signals is unsigned char. We want to clear two flags here. #define SerialSignal_RTS 0x20 /* Request to Send */ #define SerialSignal_DTR 0x80 /* Data Terminal Ready */ Without the parenthesis then it does: info->serial_signals &= 0x5f; With the parenthesis it does: info->serial_signals &= 0xffffff5f; info->serial_signals is an unsigned char so the two statements are equivalent, but it's cleaner to add the parenthesis. In other dtr_rts() functions the parenthesis are there so this makes it more consistent. Other changes: Convert all + uses to | for these bit operations. Reorder the multiple fields for consistency. Update the comments too. cc: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Signed-off-by: Joe Perches <joe@xxxxxxxxxxx> --- drivers/char/pcmcia/synclink_cs.c | 26 ++++++++++++------------- drivers/tty/synclink.c | 26 ++++++++++++------------- drivers/tty/synclink_gt.c | 26 ++++++++++++------------- drivers/tty/synclinkmp.c | 40 +++++++++++++++++++-------------------- 4 files changed, 59 insertions(+), 59 deletions(-) diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c index 34e52ed..d0c9852 100644 --- a/drivers/char/pcmcia/synclink_cs.c +++ b/drivers/char/pcmcia/synclink_cs.c @@ -1343,7 +1343,7 @@ static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty) reset_device(info); if (!tty || tty->termios.c_cflag & HUPCL) { - info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS); + info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); set_signals(info); } @@ -1405,12 +1405,12 @@ static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty) cflag = tty->termios.c_cflag; - /* if B0 rate (hangup) specified then negate DTR and RTS */ - /* otherwise assert DTR and RTS */ + /* if B0 rate (hangup) specified then negate RTS and DTR */ + /* otherwise assert RTS and DTR */ if (cflag & CBAUD) - info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR; + info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR; else - info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR); + info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); /* byte size and parity */ @@ -2301,7 +2301,7 @@ static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_term /* Handle transition to B0 status */ if (old_termios->c_cflag & CBAUD && !(tty->termios.c_cflag & CBAUD)) { - info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR); + info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); spin_lock_irqsave(&info->lock,flags); set_signals(info); spin_unlock_irqrestore(&info->lock,flags); @@ -2464,9 +2464,9 @@ static void dtr_rts(struct tty_port *port, int onoff) spin_lock_irqsave(&info->lock,flags); if (onoff) - info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR; + info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR; else - info->serial_signals &= ~SerialSignal_RTS + SerialSignal_DTR; + info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); set_signals(info); spin_unlock_irqrestore(&info->lock,flags); } @@ -3575,8 +3575,8 @@ static void get_signals(MGSLPC_INFO *info) { unsigned char status = 0; - /* preserve DTR and RTS */ - info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS; + /* preserve RTS and DTR */ + info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR; if (read_reg(info, CHB + VSTR) & BIT7) info->serial_signals |= SerialSignal_DCD; @@ -3590,7 +3590,7 @@ static void get_signals(MGSLPC_INFO *info) info->serial_signals |= SerialSignal_DSR; } -/* Set the state of DTR and RTS based on contents of +/* Set the state of RTS and DTR based on contents of * serial_signals member of device extension. */ static void set_signals(MGSLPC_INFO *info) @@ -4009,8 +4009,8 @@ static int hdlcdev_open(struct net_device *dev) spin_unlock_irqrestore(&info->netlock, flags); return rc; } - /* assert DTR and RTS, apply hardware settings */ - info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR; + /* assert RTS and DTR, apply hardware settings */ + info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR; mgslpc_program_hw(info, tty); tty_kref_put(tty); diff --git a/drivers/tty/synclink.c b/drivers/tty/synclink.c index 555fdc0..8983276 100644 --- a/drivers/tty/synclink.c +++ b/drivers/tty/synclink.c @@ -1850,7 +1850,7 @@ static void shutdown(struct mgsl_struct * info) usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) | BIT12)); if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) { - info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS); + info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); usc_set_serial_signals(info); } @@ -1915,12 +1915,12 @@ static void mgsl_change_params(struct mgsl_struct *info) cflag = info->port.tty->termios.c_cflag; - /* if B0 rate (hangup) specified then negate DTR and RTS */ - /* otherwise assert DTR and RTS */ + /* if B0 rate (hangup) specified then negate RTS and DTR */ + /* otherwise assert RTS and DTR */ if (cflag & CBAUD) - info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR; + info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR; else - info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR); + info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); /* byte size and parity */ @@ -3044,7 +3044,7 @@ static void mgsl_set_termios(struct tty_struct *tty, struct ktermios *old_termio /* Handle transition to B0 status */ if (old_termios->c_cflag & CBAUD && !(tty->termios.c_cflag & CBAUD)) { - info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR); + info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); spin_lock_irqsave(&info->irq_spinlock,flags); usc_set_serial_signals(info); spin_unlock_irqrestore(&info->irq_spinlock,flags); @@ -3243,9 +3243,9 @@ static void dtr_rts(struct tty_port *port, int on) spin_lock_irqsave(&info->irq_spinlock,flags); if (on) - info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR; + info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR; else - info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR); + info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); usc_set_serial_signals(info); spin_unlock_irqrestore(&info->irq_spinlock,flags); } @@ -6239,8 +6239,8 @@ static void usc_get_serial_signals( struct mgsl_struct *info ) { u16 status; - /* clear all serial signals except DTR and RTS */ - info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS; + /* clear all serial signals except RTS and DTR */ + info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR; /* Read the Misc Interrupt status Register (MISR) to get */ /* the V24 status signals. */ @@ -6265,7 +6265,7 @@ static void usc_get_serial_signals( struct mgsl_struct *info ) /* usc_set_serial_signals() * - * Set the state of DTR and RTS based on contents of + * Set the state of RTS and DTR based on contents of * serial_signals member of device extension. * * Arguments: info pointer to device instance data @@ -7779,8 +7779,8 @@ static int hdlcdev_open(struct net_device *dev) return rc; } - /* assert DTR and RTS, apply hardware settings */ - info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR; + /* assert RTS and DTR, apply hardware settings */ + info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR; mgsl_program_hw(info); /* enable network layer transmit */ diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c index ac8599a..aa9eece 100644 --- a/drivers/tty/synclink_gt.c +++ b/drivers/tty/synclink_gt.c @@ -785,7 +785,7 @@ static void set_termios(struct tty_struct *tty, struct ktermios *old_termios) /* Handle transition to B0 status */ if (old_termios->c_cflag & CBAUD && !(tty->termios.c_cflag & CBAUD)) { - info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR); + info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR); spin_lock_irqsave(&info->lock,flags); set_signals(info); spin_unlock_irqrestore(&info->lock,flags); @@ -1560,8 +1560,8 @@ static int hdlcdev_open(struct net_device *dev) return rc; } - /* assert DTR and RTS, apply hardware settings */ - info->signals |= SerialSignal_RTS + SerialSignal_DTR; + /* assert RTS and DTR, apply hardware settings */ + info->signals |= SerialSignal_RTS | SerialSignal_DTR; program_hw(info); /* enable network layer transmit */ @@ -2488,7 +2488,7 @@ static void shutdown(struct slgt_info *info) slgt_irq_off(info, IRQ_ALL | IRQ_MASTER); if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) { - info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS); + info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR); set_signals(info); } @@ -2548,12 +2548,12 @@ static void change_params(struct slgt_info *info) cflag = info->port.tty->termios.c_cflag; - /* if B0 rate (hangup) specified then negate DTR and RTS */ - /* otherwise assert DTR and RTS */ + /* if B0 rate (hangup) specified then negate RTS and DTR */ + /* otherwise assert RTS and DTR */ if (cflag & CBAUD) - info->signals |= SerialSignal_RTS + SerialSignal_DTR; + info->signals |= SerialSignal_RTS | SerialSignal_DTR; else - info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR); + info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR); /* byte size and parity */ @@ -3256,9 +3256,9 @@ static void dtr_rts(struct tty_port *port, int on) spin_lock_irqsave(&info->lock,flags); if (on) - info->signals |= SerialSignal_RTS + SerialSignal_DTR; + info->signals |= SerialSignal_RTS | SerialSignal_DTR; else - info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR); + info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR); set_signals(info); spin_unlock_irqrestore(&info->lock,flags); } @@ -4119,7 +4119,7 @@ static void reset_port(struct slgt_info *info) tx_stop(info); rx_stop(info); - info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS); + info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR); set_signals(info); slgt_irq_off(info, IRQ_ALL | IRQ_MASTER); @@ -4546,8 +4546,8 @@ static void get_signals(struct slgt_info *info) { unsigned short status = rd_reg16(info, SSR); - /* clear all serial signals except DTR and RTS */ - info->signals &= SerialSignal_DTR + SerialSignal_RTS; + /* clear all serial signals except RTS and DTR */ + info->signals &= SerialSignal_RTS | SerialSignal_DTR; if (status & BIT3) info->signals |= SerialSignal_DSR; diff --git a/drivers/tty/synclinkmp.c b/drivers/tty/synclinkmp.c index 5454025..6d5780c 100644 --- a/drivers/tty/synclinkmp.c +++ b/drivers/tty/synclinkmp.c @@ -882,7 +882,7 @@ static void set_termios(struct tty_struct *tty, struct ktermios *old_termios) /* Handle transition to B0 status */ if (old_termios->c_cflag & CBAUD && !(tty->termios.c_cflag & CBAUD)) { - info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR); + info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); spin_lock_irqsave(&info->lock,flags); set_signals(info); spin_unlock_irqrestore(&info->lock,flags); @@ -1676,8 +1676,8 @@ static int hdlcdev_open(struct net_device *dev) return rc; } - /* assert DTR and RTS, apply hardware settings */ - info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR; + /* assert RTS and DTR, apply hardware settings */ + info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR; program_hw(info); /* enable network layer transmit */ @@ -2706,7 +2706,7 @@ static void shutdown(SLMP_INFO * info) reset_port(info); if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) { - info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS); + info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); set_signals(info); } @@ -2768,12 +2768,12 @@ static void change_params(SLMP_INFO *info) cflag = info->port.tty->termios.c_cflag; - /* if B0 rate (hangup) specified then negate DTR and RTS */ - /* otherwise assert DTR and RTS */ + /* if B0 rate (hangup) specified then negate RTS and DTR */ + /* otherwise assert RTS and DTR */ if (cflag & CBAUD) - info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR; + info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR; else - info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR); + info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); /* byte size and parity */ @@ -3212,12 +3212,12 @@ static int tiocmget(struct tty_struct *tty) get_signals(info); spin_unlock_irqrestore(&info->lock,flags); - result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) + - ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) + - ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) + - ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) + - ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) + - ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0); + result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS : 0) | + ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR : 0) | + ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR : 0) | + ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG : 0) | + ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR : 0) | + ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS : 0); if (debug_level >= DEBUG_LEVEL_INFO) printk("%s(%d):%s tiocmget() value=%08X\n", @@ -3272,9 +3272,9 @@ static void dtr_rts(struct tty_port *port, int on) spin_lock_irqsave(&info->lock,flags); if (on) - info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR; + info->serial_signals |= SerialSignal_RTS | SerialSignal_DTR; else - info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR); + info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); set_signals(info); spin_unlock_irqrestore(&info->lock,flags); } @@ -4354,7 +4354,7 @@ static void reset_port(SLMP_INFO *info) tx_stop(info); rx_stop(info); - info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS); + info->serial_signals &= ~(SerialSignal_RTS | SerialSignal_DTR); set_signals(info); /* disable all port interrupts */ @@ -4750,8 +4750,8 @@ static void get_signals(SLMP_INFO *info) u16 gpstatus = read_status_reg(info); u16 testbit; - /* clear all serial signals except DTR and RTS */ - info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS; + /* clear all serial signals except RTS and DTR */ + info->serial_signals &= SerialSignal_RTS | SerialSignal_DTR; /* set serial signal bits to reflect MISR */ @@ -4770,7 +4770,7 @@ static void get_signals(SLMP_INFO *info) info->serial_signals |= SerialSignal_DSR; } -/* Set the state of DTR and RTS based on contents of +/* Set the state of RTS and DTR based on contents of * serial_signals member of device context. */ static void set_signals(SLMP_INFO *info) -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
