smsc-ircc2: tidy up module parameter checking

To determine whether the user specified a module parameter, use some #defines
instead of checking for bare magic numbers.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Keith Owens <kaos@ocs.com.au>
Cc: Len Brown <lenb@kernel.org>
Cc: Adam Belay <ambx1@neo.rr.com>
Cc: Matthieu CASTET <castet.matthieu@free.fr>
Cc: Jean Tourrilhes <jt@hpl.hp.com>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Ville Syrjala <syrjala@sci.fi>
Cc: Russell King <rmk+serial@arm.linux.org.uk>
Cc: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/net/irda/smsc-ircc2.c

@@ -79,11 +79,13 @@ MODULE_AUTHOR("Daniele Peri <peri@csai.unipa.it>");
 MODULE_DESCRIPTION("SMC IrCC SIR/FIR controller driver");
 MODULE_LICENSE("GPL");
 
-static int ircc_dma = 255;
+#define DMA_INVAL 255
+static int ircc_dma = DMA_INVAL;
 module_param(ircc_dma, int, 0);
 MODULE_PARM_DESC(ircc_dma, "DMA channel");
 
-static int ircc_irq = 255;
+#define IRQ_INVAL 255
+static int ircc_irq = IRQ_INVAL;
 module_param(ircc_irq, int, 0);
 MODULE_PARM_DESC(ircc_irq, "IRQ line");
 
@@ -646,15 +648,15 @@ static void smsc_ircc_setup_io(struct smsc_ircc_cb *self,
 	self->io.fifo_size = SMSC_IRCC2_FIFO_SIZE;
 	self->io.speed = SMSC_IRCC2_C_IRDA_FALLBACK_SPEED;
 
-	if (irq < 255) {
+	if (irq != IRQ_INVAL) {
 		if (irq != chip_irq)
 			IRDA_MESSAGE("%s, Overriding IRQ - chip says %d, using %d\n",
 				     driver_name, chip_irq, irq);
 		self->io.irq = irq;
 	} else
 		self->io.irq = chip_irq;
 
-	if (dma < 255) {
+	if (dma != DMA_INVAL) {
 		if (dma != chip_dma)
 			IRDA_MESSAGE("%s, Overriding DMA - chip says %d, using %d\n",
 				     driver_name, chip_dma, dma);
@@ -2836,9 +2838,9 @@ static int __init smsc_ircc_preconfigure_subsystems(unsigned short ircc_cfg,
 					tmpconf.fir_io = ircc_fir;
 				if (ircc_sir != 0)
 					tmpconf.sir_io = ircc_sir;
-				if (ircc_dma != 0xff)
+				if (ircc_dma != DMA_INVAL)
 					tmpconf.fir_dma = ircc_dma;
-				if (ircc_irq != 0xff)
+				if (ircc_irq != IRQ_INVAL)
 					tmpconf.fir_irq = ircc_irq;
 
 				IRDA_MESSAGE("Detected unconfigured %s SMSC IrDA chip, pre-configuring device.\n", conf->name);