diff --git a/target-s390x/ioinst.c b/target-s390x/ioinst.c
index 098bd8d5d3..85fd285736 100644
--- a/target-s390x/ioinst.c
+++ b/target-s390x/ioinst.c
@@ -151,11 +151,6 @@ int ioinst_handle_msch(CPUS390XState *env, uint64_t reg1, uint32_t ipb)
     int cc;
     hwaddr len = sizeof(*schib);
 
-    if (ioinst_disassemble_sch_ident(reg1, &m, &cssid, &ssid, &schid)) {
-        program_interrupt(env, PGM_OPERAND, 2);
-        return -EIO;
-    }
-    trace_ioinst_sch_id("msch", cssid, ssid, schid);
     addr = decode_basedisp_s(env, ipb);
     if (addr & 3) {
         program_interrupt(env, PGM_SPECIFICATION, 2);
@@ -167,11 +162,13 @@ int ioinst_handle_msch(CPUS390XState *env, uint64_t reg1, uint32_t ipb)
         cc = -EIO;
         goto out;
     }
-    if (!ioinst_schib_valid(schib)) {
+    if (ioinst_disassemble_sch_ident(reg1, &m, &cssid, &ssid, &schid) ||
+        !ioinst_schib_valid(schib)) {
         program_interrupt(env, PGM_OPERAND, 2);
         cc = -EIO;
         goto out;
     }
+    trace_ioinst_sch_id("msch", cssid, ssid, schid);
     sch = css_find_subch(m, cssid, ssid, schid);
     if (sch && css_subch_visible(sch)) {
         ret = css_do_msch(sch, schib);
@@ -226,11 +223,6 @@ int ioinst_handle_ssch(CPUS390XState *env, uint64_t reg1, uint32_t ipb)
     int cc;
     hwaddr len = sizeof(*orig_orb);
 
-    if (ioinst_disassemble_sch_ident(reg1, &m, &cssid, &ssid, &schid)) {
-        program_interrupt(env, PGM_OPERAND, 2);
-        return -EIO;
-    }
-    trace_ioinst_sch_id("ssch", cssid, ssid, schid);
     addr = decode_basedisp_s(env, ipb);
     if (addr & 3) {
         program_interrupt(env, PGM_SPECIFICATION, 2);
@@ -243,11 +235,13 @@ int ioinst_handle_ssch(CPUS390XState *env, uint64_t reg1, uint32_t ipb)
         goto out;
     }
     copy_orb_from_guest(&orb, orig_orb);
-    if (!ioinst_orb_valid(&orb)) {
+    if (ioinst_disassemble_sch_ident(reg1, &m, &cssid, &ssid, &schid) ||
+        !ioinst_orb_valid(&orb)) {
         program_interrupt(env, PGM_OPERAND, 2);
         cc = -EIO;
         goto out;
     }
+    trace_ioinst_sch_id("ssch", cssid, ssid, schid);
     sch = css_find_subch(m, cssid, ssid, schid);
     if (sch && css_subch_visible(sch)) {
         ret = css_do_ssch(sch, &orb);
@@ -306,11 +300,6 @@ int ioinst_handle_stsch(CPUS390XState *env, uint64_t reg1, uint32_t ipb)
     SCHIB *schib;
     hwaddr len = sizeof(*schib);
 
-    if (ioinst_disassemble_sch_ident(reg1, &m, &cssid, &ssid, &schid)) {
-        program_interrupt(env, PGM_OPERAND, 2);
-        return -EIO;
-    }
-    trace_ioinst_sch_id("stsch", cssid, ssid, schid);
     addr = decode_basedisp_s(env, ipb);
     if (addr & 3) {
         program_interrupt(env, PGM_SPECIFICATION, 2);
@@ -322,6 +311,13 @@ int ioinst_handle_stsch(CPUS390XState *env, uint64_t reg1, uint32_t ipb)
         cc = -EIO;
         goto out;
     }
+
+    if (ioinst_disassemble_sch_ident(reg1, &m, &cssid, &ssid, &schid)) {
+        program_interrupt(env, PGM_OPERAND, 2);
+        cc = -EIO;
+        goto out;
+    }
+    trace_ioinst_sch_id("stsch", cssid, ssid, schid);
     sch = css_find_subch(m, cssid, ssid, schid);
     if (sch) {
         if (css_subch_visible(sch)) {