From: Paolo Bonzini <pbonzini@redhat.com>

Date: Tue, 14 Jun 2016 15:10:24 +0200

Subject: [PATCH] scsi: esp: respect FIFO invariant after message phase

The FIFO contains two bytes; hence the write ptr should be two bytes ahead

of the read pointer.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

(cherry picked from commit d020aa504cec8f525b55ba2ef982c09dc847c72e)

---

 hw/scsi/esp.c | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c

index c2f6f8f..6407844 100644

--- a/hw/scsi/esp.c

+++ b/hw/scsi/esp.c

@@ -222,7 +222,7 @@ static void write_response(ESPState *s)

     } else {

         s->ti_size = 2;

         s->ti_rptr = 0;

-        s->ti_wptr = 0;

+        s->ti_wptr = 2;

         s->rregs[ESP_RFLAGS] = 2;

     }

     esp_raise_irq(s);