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-rw-r--r--target-s390x/cpu.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h
index 01e59b99f0..fa8dfe0737 100644
--- a/target-s390x/cpu.h
+++ b/target-s390x/cpu.h
@@ -1001,7 +1001,7 @@ static inline void cpu_inject_io(S390CPU *cpu, uint16_t subchannel_id,
uint32_t io_int_parm, uint32_t io_int_word)
{
CPUS390XState *env = &cpu->env;
- int isc = ffs(io_int_word << 2) - 1;
+ int isc = IO_INT_WORD_ISC(io_int_word);
if (env->io_index[isc] == MAX_IO_QUEUE - 1) {
/* ugh - can't queue anymore. Let's drop. */