1 files changed, 12 insertions, 6 deletions

diff --git a/sound/isa/gus/gus_irq.c b/sound/isa/gus/gus_irq.c
index a0430b338d67..cd9a6f1c99e6 100644
--- a/sound/isa/gus/gus_irq.c
+++ b/sound/isa/gus/gus_irq.c
@@ -45,11 +45,13 @@ __again:
         // snd_printk("IRQ: status = 0x%x\n", status);
         if (status & 0x02) {
                 STAT_ADD(gus->gf1.interrupt_stat_midi_in);
-                gus->gf1.interrupt_handler_midi_in(gus);
+                if (gus->gf1.interrupt_handler_midi_in)
+                        gus->gf1.interrupt_handler_midi_in(gus);
         }
         if (status & 0x01) {
                 STAT_ADD(gus->gf1.interrupt_stat_midi_out);
-                gus->gf1.interrupt_handler_midi_out(gus);
+                if (gus->gf1.interrupt_handler_midi_out)
+                        gus->gf1.interrupt_handler_midi_out(gus);
         }
         if (status & (0x20 | 0x40)) {
                 unsigned int already, _current_;
@@ -85,20 +87,24 @@ __again:
         }
         if (status & 0x04) {
                 STAT_ADD(gus->gf1.interrupt_stat_timer1);
-                gus->gf1.interrupt_handler_timer1(gus);
+                if (gus->gf1.interrupt_handler_timer1)
+                        gus->gf1.interrupt_handler_timer1(gus);
         }
         if (status & 0x08) {
                 STAT_ADD(gus->gf1.interrupt_stat_timer2);
-                gus->gf1.interrupt_handler_timer2(gus);
+                if (gus->gf1.interrupt_handler_timer2)
+                        gus->gf1.interrupt_handler_timer2(gus);
         }
         if (status & 0x80) {
                 if (snd_gf1_i_look8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL) & 0x40) {
                         STAT_ADD(gus->gf1.interrupt_stat_dma_write);
-                        gus->gf1.interrupt_handler_dma_write(gus);
+                        if (gus->gf1.interrupt_handler_dma_write)
+                                gus->gf1.interrupt_handler_dma_write(gus);
                 }
                 if (snd_gf1_i_look8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL) & 0x40) {
                         STAT_ADD(gus->gf1.interrupt_stat_dma_read);
-                        gus->gf1.interrupt_handler_dma_read(gus);
+                        if (gus->gf1.interrupt_handler_dma_read)
+                                gus->gf1.interrupt_handler_dma_read(gus);
                 }
         }
         if (--loop > 0)