[Qemu-devel] sparc32 fix spurious dma interrupts

[Artyom Tarasenko <atar4qemu@googlemail.com>]

Don't raise interrupt when not enabled.
Don't set DMA_INTR bit spuriously.
Don't print misleading debug messages "Raise IRQ" when not raising any.

Signed-off-by: Artyom Tarasenko <atar4qemu@gmail.com>
---
diff --git a/hw/sparc32_dma.c b/hw/sparc32_dma.c
index 6e991e0..b2992ca 100644
--- a/hw/sparc32_dma.c
+++ b/hw/sparc32_dma.c
@@ -125,9 +125,11 @@ static void dma_set_irq(void *opaque, int irq, int level)
 {
     DMAState *s = opaque;
     if (level) {
-        DPRINTF("Raise IRQ\n");
         s->dmaregs[0] |= DMA_INTR;
-        qemu_irq_raise(s->irq);
+        if (s->dmaregs[0] & DMA_INTREN) {
+            DPRINTF("Raise IRQ\n");
+            qemu_irq_raise(s->irq);
+        }
     } else {
         s->dmaregs[0] &= ~DMA_INTR;
         DPRINTF("Lower IRQ\n");
@@ -142,8 +145,6 @@ void espdma_memory_read(void *opaque, uint8_t *buf, int len)
     DPRINTF("DMA read, direction: %c, addr 0x%8.8x\n",
             s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]);
     sparc_iommu_memory_read(s->iommu, s->dmaregs[1], buf, len);
-    DPRINTF("Raise IRQ\n");
-    s->dmaregs[0] |= DMA_INTR;
     s->dmaregs[1] += len;
 }
 
@@ -154,8 +155,6 @@ void espdma_memory_write(void *opaque, uint8_t *buf, int len)
     DPRINTF("DMA write, direction: %c, addr 0x%8.8x\n",
             s->dmaregs[0] & DMA_WRITE_MEM ? 'w': 'r', s->dmaregs[1]);
     sparc_iommu_memory_write(s->iommu, s->dmaregs[1], buf, len);
-    DPRINTF("Raise IRQ\n");
-    s->dmaregs[0] |= DMA_INTR;
     s->dmaregs[1] += len;
 }