lsi: check if SIGP bit is already set in Wait reselect

If SIGP is set, the 'Wait for Reselection' command should jump
immediately to the address stored in the second DWORD of the
instruction. This fixes spurious hangs in the HP-UX 11.11
installer when the SIGP bit gets set by the kernel before the
'Wait for Reselection' command is executed by SCRIPTS.

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Tested-by: Helge Deller <deller@gmx.de>
Message-Id: <20190217113717.7077-1-svens@stackframe.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c
index 8ba07f875630c96374b1f623442096b45b510b1a..bcff859bacc869aa16e5e5e2ba8ea4668ffbd419 100644 (file)
--- a/hw/scsi/lsi53c895a.c
+++ b/hw/scsi/lsi53c895a.c
@@ -1297,8 +1297,10 @@ again:
                 }
                 break;
             case 2: /* Wait Reselect */
-                if (!lsi_irq_on_rsl(s)) {
-                    lsi_wait_reselect(s);
+                if (s->istat0 & LSI_ISTAT0_SIGP) {
+                    s->dsp = s->dnad;
+                } else if (!lsi_irq_on_rsl(s)) {
+                        lsi_wait_reselect(s);
                 }
                 break;
             case 3: /* Set */