hw/scsi/lsi53c895a: stop script on phase mismatch

Netbsd isn't happy with qemu lsi53c895a emulation:

cd0(esiop0:0:2:0): command with tag id 0 reset
esiop0: autoconfiguration error: phase mismatch without command
esiop0: autoconfiguration error: unhandled scsi interrupt, sist=0x80 sstat1=0x0 DSA=0x23a64b1 DSP=0x50

This is because lsi_bad_phase() triggers a phase mismatch, which
stops SCRIPT processing. However, after returning to
lsi_command_complete(), SCRIPT is restarted with lsi_resume_script().
Fix this by adding a return value to lsi_bad_phase(), and only resume
script processing when lsi_bad_phase() didn't trigger a host interrupt.

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Tested-by: Helge Deller <deller@gmx.de>
Message-ID: <20240302214453.2071388-1-svens@stackframe.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit a9198b3)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

hw/scsi/lsi53c895a.c

@@ -570,8 +570,9 @@ static inline void lsi_set_phase(LSIState *s, int phase)
     s->sstat1 = (s->sstat1 & ~PHASE_MASK) | phase;
 }
 
-static void lsi_bad_phase(LSIState *s, int out, int new_phase)
+static int lsi_bad_phase(LSIState *s, int out, int new_phase)
 {
+    int ret = 0;
     /* Trigger a phase mismatch.  */
     if (s->ccntl0 & LSI_CCNTL0_ENPMJ) {
         if ((s->ccntl0 & LSI_CCNTL0_PMJCTL)) {
@@ -584,8 +585,10 @@ static void lsi_bad_phase(LSIState *s, int out, int new_phase)
         trace_lsi_bad_phase_interrupt();
         lsi_script_scsi_interrupt(s, LSI_SIST0_MA, 0);
         lsi_stop_script(s);
+        ret = 1;
     }
     lsi_set_phase(s, new_phase);
+    return ret;
 }
 
 
@@ -789,15 +792,18 @@ static int lsi_queue_req(LSIState *s, SCSIRequest *req, uint32_t len)
 static void lsi_command_complete(SCSIRequest *req, size_t resid)
 {
     LSIState *s = LSI53C895A(req->bus->qbus.parent);
-    int out;
+    int out, stop = 0;
 
     out = (s->sstat1 & PHASE_MASK) == PHASE_DO;
     trace_lsi_command_complete(req->status);
     s->status = req->status;
     s->command_complete = 2;
     if (s->waiting && s->dbc != 0) {
         /* Raise phase mismatch for short transfers.  */
-        lsi_bad_phase(s, out, PHASE_ST);
+        stop = lsi_bad_phase(s, out, PHASE_ST);
+        if (stop) {
+            s->waiting = 0;
+        }
     } else {
         lsi_set_phase(s, PHASE_ST);
     }
@@ -807,7 +813,9 @@ static void lsi_command_complete(SCSIRequest *req, size_t resid)
         lsi_request_free(s, s->current);
         scsi_req_unref(req);
     }
-    lsi_resume_script(s);
+    if (!stop) {
+        lsi_resume_script(s);
+    }
 }
 
  /* Callback to indicate that the SCSI layer has completed a transfer.  */