ARM: omap: remove references to disable_irq_lch

The disable_irq_lch method is never actually used, so there's not much
point it existing; remove it.
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-omap1/dma.c

@@ -363,7 +363,6 @@ static int __init omap1_system_dma_init(void)
 	p->clear_dma		= omap1_clear_dma;
 	p->dma_write		= dma_write;
 	p->dma_read		= dma_read;
-	p->disable_irq_lch	= NULL;
 
 	p->errata = configure_dma_errata();
 

arch/arm/mach-omap2/dma.c

@@ -112,15 +112,6 @@ static inline u32 dma_read(int reg, int lch)
 	return val;
 }
 
-static inline void omap2_disable_irq_lch(int lch)
-{
-	u32 val;
-
-	val = dma_read(IRQENABLE_L0, lch);
-	val &= ~(1 << lch);
-	dma_write(val, IRQENABLE_L0, lch);
-}
-
 static void omap2_clear_dma(int lch)
 {
 	int i = dma_common_ch_start;
@@ -239,7 +230,6 @@ static int __init omap2_system_dma_init_dev(struct omap_hwmod *oh, void *unused)
 	}
 
 	p->dma_attr		= (struct omap_dma_dev_attr *)oh->dev_attr;
-	p->disable_irq_lch	= omap2_disable_irq_lch;
 	p->show_dma_caps	= omap2_show_dma_caps;
 	p->clear_dma		= omap2_clear_dma;
 	p->dma_write		= dma_write;

include/linux/omap-dma.h

@@ -275,7 +275,6 @@ struct omap_dma_dev_attr {
 struct omap_system_dma_plat_info {
 	struct omap_dma_dev_attr *dma_attr;
 	u32 errata;
-	void (*disable_irq_lch)(int lch);
 	void (*show_dma_caps)(void);
 	void (*clear_lch_regs)(int lch);
 	void (*clear_dma)(int lch);