cpu_single_env usage fix

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1644 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 3 insertions, 1 deletions

diff --git a/hw/dma.c b/hw/dma.c
index ce828699f0..ea13eae492 100644
--- a/hw/dma.c
+++ b/hw/dma.c
@@ -427,7 +427,9 @@ int DMA_write_memory (int nchan, void *buf, int pos, int len)
 /* request the emulator to transfer a new DMA memory block ASAP */
 void DMA_schedule(int nchan)
 {
-    cpu_interrupt(cpu_single_env, CPU_INTERRUPT_EXIT);
+    CPUState *env = cpu_single_env;
+    if (env)
+        cpu_interrupt(env, CPU_INTERRUPT_EXIT);
 }
 
 static void dma_reset(void *opaque)