From: Jiri Slaby Date: Mon, 2 Apr 2012 11:54:44 +0000 (+0200) Subject: TTY: 68328serial, propagate tty X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=467712c916764859f7ea698d38d03c51bb827da8;p=linux-beck.git TTY: 68328serial, propagate tty We need tty at some places, but info->tty might be NULL at those. Let us propagate tty from callers where we know we have a valid tty. This will make a switch to tty refcounting simpler. Signed-off-by: Jiri Slaby Cc: Geert Uytterhoeven Cc: linux-m68k@lists.linux-m68k.org Acked-by: Greg Ungerer Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/68328serial.c b/drivers/tty/serial/68328serial.c index e3a1c557fe95..fde573b32ce0 100644 --- a/drivers/tty/serial/68328serial.c +++ b/drivers/tty/serial/68328serial.c @@ -140,7 +140,7 @@ m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR; struct tty_driver *serial_driver; -static void change_speed(struct m68k_serial *info); +static void change_speed(struct m68k_serial *info, struct tty_struct *tty); /* * Setup for console. Argument comes from the boot command line. @@ -263,9 +263,9 @@ static void rs_start(struct tty_struct *tty) local_irq_restore(flags); } -static void receive_chars(struct m68k_serial *info, unsigned short rx) +static void receive_chars(struct m68k_serial *info, struct tty_struct *tty, + unsigned short rx) { - struct tty_struct *tty = info->tty; m68328_uart *uart = &uart_addr[info->line]; unsigned char ch, flag; @@ -317,7 +317,7 @@ clear_and_exit: return; } -static void transmit_chars(struct m68k_serial *info) +static void transmit_chars(struct m68k_serial *info, struct tty_struct *tty) { m68328_uart *uart = &uart_addr[info->line]; @@ -328,7 +328,7 @@ static void transmit_chars(struct m68k_serial *info) goto clear_and_return; } - if((info->xmit_cnt <= 0) || info->tty->stopped) { + if ((info->xmit_cnt <= 0) || !tty || tty->stopped) { /* That's peculiar... TX ints off */ uart->ustcnt &= ~USTCNT_TX_INTR_MASK; goto clear_and_return; @@ -356,6 +356,7 @@ clear_and_return: irqreturn_t rs_interrupt(int irq, void *dev_id) { struct m68k_serial *info = dev_id; + struct tty_struct *tty = info->tty; m68328_uart *uart; unsigned short rx; unsigned short tx; @@ -366,15 +367,17 @@ irqreturn_t rs_interrupt(int irq, void *dev_id) #ifdef USE_INTS tx = uart->utx.w; - if (rx & URX_DATA_READY) receive_chars(info, rx); - if (tx & UTX_TX_AVAIL) transmit_chars(info); + if (rx & URX_DATA_READY) + receive_chars(info, tty, rx); + if (tx & UTX_TX_AVAIL) + transmit_chars(info, tty); #else - receive_chars(info, rx); + receive_chars(info, tty, rx); #endif return IRQ_HANDLED; } -static int startup(struct m68k_serial * info) +static int startup(struct m68k_serial *info, struct tty_struct *tty) { m68328_uart *uart = &uart_addr[info->line]; unsigned long flags; @@ -409,15 +412,15 @@ static int startup(struct m68k_serial * info) uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK; #endif - if (info->tty) - clear_bit(TTY_IO_ERROR, &info->tty->flags); + if (tty) + clear_bit(TTY_IO_ERROR, &tty->flags); info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; /* * and set the speed of the serial port */ - change_speed(info); + change_speed(info, tty); info->tport.flags |= ASYNC_INITIALIZED; local_irq_restore(flags); @@ -428,7 +431,7 @@ static int startup(struct m68k_serial * info) * This routine will shutdown a serial port; interrupts are disabled, and * DTR is dropped if the hangup on close termio flag is on. */ -static void shutdown(struct m68k_serial * info) +static void shutdown(struct m68k_serial *info, struct tty_struct *tty) { m68328_uart *uart = &uart_addr[info->line]; unsigned long flags; @@ -444,8 +447,8 @@ static void shutdown(struct m68k_serial * info) info->xmit_buf = 0; } - if (info->tty) - set_bit(TTY_IO_ERROR, &info->tty->flags); + if (tty) + set_bit(TTY_IO_ERROR, &tty->flags); info->tport.flags &= ~ASYNC_INITIALIZED; local_irq_restore(flags); @@ -503,7 +506,7 @@ struct { * This routine is called to set the UART divisor registers to match * the specified baud rate for a serial port. */ -static void change_speed(struct m68k_serial *info) +static void change_speed(struct m68k_serial *info, struct tty_struct *tty) { m68328_uart *uart = &uart_addr[info->line]; unsigned short port; @@ -511,9 +514,7 @@ static void change_speed(struct m68k_serial *info) unsigned cflag; int i; - if (!info->tty || !info->tty->termios) - return; - cflag = info->tty->termios->c_cflag; + cflag = tty->termios->c_cflag; if (!(port = info->port)) return; @@ -832,7 +833,7 @@ static int get_serial_info(struct m68k_serial * info, return 0; } -static int set_serial_info(struct m68k_serial * info, +static int set_serial_info(struct m68k_serial *info, struct tty_struct *tty, struct serial_struct * new_info) { struct tty_port *port = &info->tport; @@ -875,7 +876,7 @@ static int set_serial_info(struct m68k_serial * info, port->closing_wait = new_serial.closing_wait; check_and_exit: - retval = startup(info); + retval = startup(info, tty); return retval; } @@ -961,7 +962,7 @@ static int rs_ioctl(struct tty_struct *tty, return get_serial_info(info, (struct serial_struct *) arg); case TIOCSSERIAL: - return set_serial_info(info, + return set_serial_info(info, tty, (struct serial_struct *) arg); case TIOCSERGETLSR: /* Get line status register */ return get_lsr_info(info, (unsigned int *) arg); @@ -980,7 +981,7 @@ static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) { struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; - change_speed(info); + change_speed(info, tty); if ((old_termios->c_cflag & CRTSCTS) && !(tty->termios->c_cflag & CRTSCTS)) { @@ -1056,7 +1057,7 @@ static void rs_close(struct tty_struct *tty, struct file * filp) uart->ustcnt &= ~USTCNT_RXEN; uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK); - shutdown(info); + shutdown(info, tty); rs_flush_buffer(tty); tty_ldisc_flush(tty); @@ -1094,7 +1095,7 @@ void rs_hangup(struct tty_struct *tty) return; rs_flush_buffer(tty); - shutdown(info); + shutdown(info, tty); info->tport.count = 0; info->tport.flags &= ~ASYNC_NORMAL_ACTIVE; info->tty = NULL; @@ -1214,7 +1215,7 @@ int rs_open(struct tty_struct *tty, struct file * filp) /* * Start up serial port */ - retval = startup(info); + retval = startup(info, tty); if (retval) return retval;