- moved disk_busy() call from xdstrategy() to xdc_startbuf()

        [prevents disk_unbusy panic when disk is loaded (if no
        free IOPBs, xdstrategy() would queue the buffer for pickup
        by xdcintr() but xdcintr() would never call disk_busy().
        xdc_startbuf() is a better place since all bufs are routed
        through here]   problem detected by girish@dworkin.wustl.edu,
        diagnosed and corrected by me.
- move disk_unbusy() call in xdc_remove_iorq() before the call to
        XDC_FREE() [don't want to access a data structure that was just put
        on a free list]

diff --git a/sys/arch/sparc/dev/xd.c b/sys/arch/sparc/dev/xd.c
index 7c64916..04d21f7 100644 (file)
--- a/sys/arch/sparc/dev/xd.c
+++ b/sys/arch/sparc/dev/xd.c
@@ -36,7 +36,7 @@
  * x d . c   x y l o g i c s   7 5 3 / 7 0 5 3   v m e / s m d   d r i v e r
  *
  * author: Chuck Cranor <chuck@ccrc.wustl.edu>
- * id: $Id: xd.c,v 1.5 1996/01/13 03:45:01 chuck Exp $
+ * id: $Id: xd.c,v 1.6 1996/02/08 04:43:45 chuck Exp $
  * started: 27-Feb-95
  * references: [1] Xylogics Model 753 User's Manual
  *                 part number: 166-753-001, Revision B, May 21, 1988.
@@ -1094,9 +1094,6 @@ xdstrategy(bp)
                return;
        }
 
-       /* Instrumentation. */
-       disk_busy(&xd->sc_dk);
-
        /* done! */
 
        splx(s);
@@ -1441,6 +1438,9 @@ xdc_startbuf(xdcsc, xdsc, bp)
 
        xdc_rqtopb(iorq, iopb, (bp->b_flags & B_READ) ? XDCMD_RD : XDCMD_WR, 0);
 
+       /* Instrumentation. */
+       disk_busy(&xdsc->sc_dk);
+
        /* now submit [note that xdc_submit_iorq can never fail on NORM reqs] */
 
        xdc_submit_iorq(xdcsc, rqno, XD_SUB_NORM);
@@ -1928,9 +1928,9 @@ xdc_remove_iorq(xdcsc)
                        dvma_mapout((vm_offset_t) iorq->dbufbase,
                                    (vm_offset_t) bp->b_un.b_addr,
                                    bp->b_bcount);
-                       XDC_FREE(xdcsc, rqno);
                        disk_unbusy(&iorq->xd->sc_dk,
                            (bp->b_bcount - bp->b_resid));
+                       XDC_FREE(xdcsc, rqno);
                        biodone(bp);
                        break;
                case XD_SUB_WAIT:

diff --git a/sys/arch/sun3/dev/xd.c b/sys/arch/sun3/dev/xd.c
index 3543a7c..3352fd1 100644 (file)
--- a/sys/arch/sun3/dev/xd.c
+++ b/sys/arch/sun3/dev/xd.c
@@ -36,7 +36,7 @@
  * x d . c   x y l o g i c s   7 5 3 / 7 0 5 3   v m e / s m d   d r i v e r
  *
  * author: Chuck Cranor <chuck@ccrc.wustl.edu>
- * id: $Id: xd.c,v 1.3 1996/01/13 03:52:44 chuck Exp $
+ * id: $Id: xd.c,v 1.4 1996/02/08 04:43:47 chuck Exp $
  * started: 27-Feb-95
  * references: [1] Xylogics Model 753 User's Manual
  *                 part number: 166-753-001, Revision B, May 21, 1988.
@@ -1067,9 +1067,6 @@ xdstrategy(bp)
                return;
        }
 
-       /* Instrumentation. */
-       disk_busy(&xd->sc_dk);
-
        /* done! */
 
        splx(s);
@@ -1425,6 +1422,9 @@ xdc_startbuf(xdcsc, xdsc, bp)
 
        xdc_rqtopb(iorq, iopb, (bp->b_flags & B_READ) ? XDCMD_RD : XDCMD_WR, 0);
 
+       /* Instrumentation. */
+       disk_busy(&xdsc->sc_dk);
+
        /* now submit [note that xdc_submit_iorq can never fail on NORM reqs] */
 
        xdc_submit_iorq(xdcsc, rqno, XD_SUB_NORM);
@@ -1911,9 +1911,9 @@ xdc_remove_iorq(xdcsc)
                        /* Sun3: map/unmap regardless of B_PHYS */
                        dvma_mapout(iorq->dbufbase,
                                            iorq->buf->b_bcount);
-                       XDC_FREE(xdcsc, rqno);
                        disk_unbusy(&iorq->xd->sc_dk,
                            (bp->b_bcount - bp->b_resid));
+                       XDC_FREE(xdcsc, rqno);
                        biodone(bp);
                        break;
                case XD_SUB_WAIT: