scsi: Fix SCSI bus reset

When the controller raises the SCSI reset line, we have to perform the requested reset on all disks attached to the controller's bus. Moreover, reset is edge triggered, so avoid repeating it if the line was already high.

Signed-off-by Jan Kiszka<[email protected]>

---
  hw/lsi53c895a.c |   15 +++++++++++++--
  1 files changed, 13 insertions(+), 2 deletions(-)

hw/lsi53c895a.c +13 -2

index 9a37fed..249c6bf 100644
@@ -1590,8 +1590,19 @@ static void lsi_reg_writeb(LSIState *s, int offset, uint8_t val)
              BADF("Immediate Arbritration not implemented\n");
          }
          if (val&  LSI_SCNTL1_RST) {
-            s->sstat0 |= LSI_SSTAT0_RST;
-            lsi_script_scsi_interrupt(s, LSI_SIST0_RST, 0);
+            if (!(s->sstat0&  LSI_SSTAT0_RST)) {
+                DeviceState *dev;
+                int id;
+
+                for (id = 0; id<  s->bus.ndev; id++) {
+                    if (s->bus.devs[id]) {
+                        dev =&s->bus.devs[id]->qdev;
+                        dev->info->reset(dev);
+                    }
+                }
+                s->sstat0 |= LSI_SSTAT0_RST;
+                lsi_script_scsi_interrupt(s, LSI_SIST0_RST, 0);
+            }
          } else {
              s->sstat0&= ~LSI_SSTAT0_RST;
          }