9 files changed, 23 insertions, 37 deletions

diff --git a/drivers/tty/serial/21285.c b/drivers/tty/serial/21285.c
index 1b37626e8f13..f899996b4363 100644
--- a/drivers/tty/serial/21285.c
+++ b/drivers/tty/serial/21285.c
@@ -331,7 +331,7 @@ static int serial21285_verify_port(struct uart_port *port, struct serial_struct
         int ret = 0;
         if (ser->type != PORT_UNKNOWN && ser->type != PORT_21285)
                 ret = -EINVAL;
-        if (ser->irq != NO_IRQ)
+        if (ser->irq <= 0)
                 ret = -EINVAL;
         if (ser->baud_base != port->uartclk / 16)
                 ret = -EINVAL;
@@ -360,7 +360,7 @@ static struct uart_ops serial21285_ops = {
 static struct uart_port serial21285_port = {
         .mapbase        = 0x42000160,
         .iotype         = UPIO_MEM,
-        .irq            = NO_IRQ,
+        .irq            = 0,
         .fifosize       = 16,
         .ops            = &serial21285_ops,
         .flags          = UPF_BOOT_AUTOCONF,
diff --git a/drivers/tty/serial/8250.c b/drivers/tty/serial/8250.c
index 9f50c4e3c2be..b0eb96139324 100644
--- a/drivers/tty/serial/8250.c
+++ b/drivers/tty/serial/8250.c
@@ -86,13 +86,6 @@ static unsigned int skip_txen_test; /* force skip of txen test at init time */
 #define BOTH_EMPTY      (UART_LSR_TEMT | UART_LSR_THRE)
 
 
-/*
- * We default to IRQ0 for the "no irq" hack.   Some
- * machine types want others as well - they're free
- * to redefine this in their header file.
- */
-#define is_real_interrupt(irq)  ((irq) != 0)
-
 #ifdef CONFIG_SERIAL_8250_DETECT_IRQ
 #define CONFIG_SERIAL_DETECT_IRQ 1
 #endif
@@ -1750,7 +1743,7 @@ static void serial8250_backup_timeout(unsigned long data)
          * Must disable interrupts or else we risk racing with the interrupt
          * based handler.
          */
-        if (is_real_interrupt(up->port.irq)) {
+        if (up->port.irq) {
                 ier = serial_in(up, UART_IER);
                 serial_out(up, UART_IER, 0);
         }
@@ -1775,7 +1768,7 @@ static void serial8250_backup_timeout(unsigned long data)
         if (!(iir & UART_IIR_NO_INT))
                 serial8250_tx_chars(up);
 
-        if (is_real_interrupt(up->port.irq))
+        if (up->port.irq)
                 serial_out(up, UART_IER, ier);
 
         spin_unlock_irqrestore(&up->port.lock, flags);
@@ -2028,7 +2021,7 @@ static int serial8250_startup(struct uart_port *port)
                 serial_outp(up, UART_LCR, 0);
         }
 
-        if (is_real_interrupt(up->port.irq)) {
+        if (up->port.irq) {
                 unsigned char iir1;
                 /*
                  * Test for UARTs that do not reassert THRE when the
@@ -2083,7 +2076,7 @@ static int serial8250_startup(struct uart_port *port)
          * hardware interrupt, we use a timer-based system.  The original
          * driver used to do this with IRQ0.
          */
-        if (!is_real_interrupt(up->port.irq)) {
+        if (!up->port.irq) {
                 up->timer.data = (unsigned long)up;
                 mod_timer(&up->timer, jiffies + uart_poll_timeout(port));
         } else {
@@ -2099,13 +2092,13 @@ static int serial8250_startup(struct uart_port *port)
 
         spin_lock_irqsave(&up->port.lock, flags);
         if (up->port.flags & UPF_FOURPORT) {
-                if (!is_real_interrupt(up->port.irq))
+                if (!up->port.irq)
                         up->port.mctrl |= TIOCM_OUT1;
         } else
                 /*
                  * Most PC uarts need OUT2 raised to enable interrupts.
                  */
-                if (is_real_interrupt(up->port.irq))
+                if (up->port.irq)
                         up->port.mctrl |= TIOCM_OUT2;
 
         serial8250_set_mctrl(&up->port, up->port.mctrl);
@@ -2223,7 +2216,7 @@ static void serial8250_shutdown(struct uart_port *port)
 
         del_timer_sync(&up->timer);
         up->timer.function = serial8250_timeout;
-        if (is_real_interrupt(up->port.irq))
+        if (up->port.irq)
                 serial_unlink_irq_chain(up);
 }
 
diff --git a/drivers/tty/serial/m32r_sio.c b/drivers/tty/serial/m32r_sio.c
index 94a6792bf97b..e465dda63edf 100644
--- a/drivers/tty/serial/m32r_sio.c
+++ b/drivers/tty/serial/m32r_sio.c
@@ -70,13 +70,6 @@
 
 #define PASS_LIMIT      256
 
-/*
- * We default to IRQ0 for the "no irq" hack.   Some
- * machine types want others as well - they're free
- * to redefine this in their header file.
- */
-#define is_real_interrupt(irq)  ((irq) != 0)
-
 #define BASE_BAUD       115200
 
 /* Standard COM flags */
@@ -640,7 +633,7 @@ static int m32r_sio_startup(struct uart_port *port)
          * hardware interrupt, we use a timer-based system.  The original
          * driver used to do this with IRQ0.
          */
-        if (!is_real_interrupt(up->port.irq)) {
+        if (!up->port.irq) {
                 unsigned int timeout = up->port.timeout;
 
                 timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
@@ -687,7 +680,7 @@ static void m32r_sio_shutdown(struct uart_port *port)
 
         sio_init();
 
-        if (!is_real_interrupt(up->port.irq))
+        if (!up->port.irq)
                 del_timer_sync(&up->timer);
         else
                 serial_unlink_irq_chain(up);
diff --git a/drivers/tty/serial/mpc52xx_uart.c b/drivers/tty/serial/mpc52xx_uart.c
index 1093a88a1fe3..e9a770d77a6e 100644
--- a/drivers/tty/serial/mpc52xx_uart.c
+++ b/drivers/tty/serial/mpc52xx_uart.c
@@ -507,7 +507,7 @@ static int __init mpc512x_psc_fifoc_init(void)
 
         psc_fifoc_irq = irq_of_parse_and_map(np, 0);
         of_node_put(np);
-        if (psc_fifoc_irq == NO_IRQ) {
+        if (psc_fifoc_irq == 0) {
                 pr_err("%s: Can't get FIFOC irq\n", __func__);
                 iounmap(psc_fifoc);
                 return -ENODEV;
@@ -1354,7 +1354,7 @@ static int __devinit mpc52xx_uart_of_probe(struct platform_device *op)
         }
 
         psc_ops->get_irq(port, op->dev.of_node);
-        if (port->irq == NO_IRQ) {
+        if (port->irq == 0) {
                 dev_dbg(&op->dev, "Could not get irq\n");
                 return -EINVAL;
         }
diff --git a/drivers/tty/serial/mux.c b/drivers/tty/serial/mux.c
index 06f6aefd5ba6..c61d950e07c1 100644
--- a/drivers/tty/serial/mux.c
+++ b/drivers/tty/serial/mux.c
@@ -499,7 +499,7 @@ static int __init mux_probe(struct parisc_device *dev)
                 port->membase   = ioremap_nocache(port->mapbase, MUX_LINE_OFFSET);
                 port->iotype    = UPIO_MEM;
                 port->type      = PORT_MUX;
-                port->irq       = NO_IRQ;
+                port->irq       = 0;
                 port->uartclk   = 0;
                 port->fifosize  = MUX_FIFO_SIZE;
                 port->ops       = &mux_pops;
diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
index e9c2dfe471a2..08ebe901bb59 100644
--- a/drivers/tty/serial/pmac_zilog.c
+++ b/drivers/tty/serial/pmac_zilog.c
@@ -1506,7 +1506,7 @@ no_dma:
          * fixed up interrupt info, but we use the device-tree directly
          * here due to early probing so we need the fixup too.
          */
-        if (uap->port.irq == NO_IRQ &&
+        if (uap->port.irq == 0 &&
             np->parent && np->parent->parent &&
             of_device_is_compatible(np->parent->parent, "gatwick")) {
                 /* IRQs on gatwick are offset by 64 */
diff --git a/drivers/tty/serial/sunzilog.c b/drivers/tty/serial/sunzilog.c
index 8e916e76b7b5..5a47d1b196d8 100644
--- a/drivers/tty/serial/sunzilog.c
+++ b/drivers/tty/serial/sunzilog.c
@@ -1397,7 +1397,7 @@ static void __devinit sunzilog_init_hw(struct uart_sunzilog_port *up)
 #endif
 }
 
-static int zilog_irq = -1;
+static int zilog_irq;
 
 static int __devinit zs_probe(struct platform_device *op)
 {
@@ -1425,7 +1425,7 @@ static int __devinit zs_probe(struct platform_device *op)
 
         rp = sunzilog_chip_regs[inst];
 
-        if (zilog_irq == -1)
+        if (!zilog_irq)
                 zilog_irq = op->archdata.irqs[0];
 
         up = &sunzilog_port_table[inst * 2];
@@ -1580,7 +1580,7 @@ static int __init sunzilog_init(void)
         if (err)
                 goto out_unregister_uart;
 
-        if (zilog_irq != -1) {
+        if (!zilog_irq) {
                 struct uart_sunzilog_port *up = sunzilog_irq_chain;
                 err = request_irq(zilog_irq, sunzilog_interrupt, IRQF_SHARED,
                                   "zs", sunzilog_irq_chain);
@@ -1621,7 +1621,7 @@ static void __exit sunzilog_exit(void)
 {
         platform_driver_unregister(&zs_driver);
 
-        if (zilog_irq != -1) {
+        if (!zilog_irq) {
                 struct uart_sunzilog_port *up = sunzilog_irq_chain;
 
                 /* Disable Interrupts */
@@ -1637,7 +1637,7 @@ static void __exit sunzilog_exit(void)
                 }
 
                 free_irq(zilog_irq, sunzilog_irq_chain);
-                zilog_irq = -1;
+                zilog_irq = 0;
         }
 
         if (sunzilog_reg.nr) {
diff --git a/drivers/tty/serial/ucc_uart.c b/drivers/tty/serial/ucc_uart.c
index 2ebe606a2db1..f99b0c965f85 100644
--- a/drivers/tty/serial/ucc_uart.c
+++ b/drivers/tty/serial/ucc_uart.c
@@ -1360,7 +1360,7 @@ static int ucc_uart_probe(struct platform_device *ofdev)
         }
 
         qe_port->port.irq = irq_of_parse_and_map(np, 0);
-        if (qe_port->port.irq == NO_IRQ) {
+        if (qe_port->port.irq == 0) {
                 dev_err(&ofdev->dev, "could not map IRQ for UCC%u\n",
                        qe_port->ucc_num + 1);
                 ret = -EINVAL;
diff --git a/drivers/tty/serial/vr41xx_siu.c b/drivers/tty/serial/vr41xx_siu.c
index 83148e79ca13..cf0d9485ec08 100644
--- a/drivers/tty/serial/vr41xx_siu.c
+++ b/drivers/tty/serial/vr41xx_siu.c
@@ -61,7 +61,7 @@
 static struct uart_port siu_uart_ports[SIU_PORTS_MAX] = {
         [0 ... SIU_PORTS_MAX-1] = {
                 .lock   = __SPIN_LOCK_UNLOCKED(siu_uart_ports->lock),
-                .irq    = -1,
+                .irq    = 0,
         },
 };
 
@@ -171,7 +171,7 @@ static inline unsigned int siu_check_type(struct uart_port *port)
 {
         if (port->line == 0)
                 return PORT_VR41XX_SIU;
-        if (port->line == 1 && port->irq != -1)
+        if (port->line == 1 && port->irq)
                 return PORT_VR41XX_DSIU;
 
         return PORT_UNKNOWN;