From: pbrook <pbrook@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Mon, 22 Sep 2008 16:30:29 +0000 (+0000)
Subject: Add comment to windows SCSI hack.
X-Git-Tag: release_0_10_0~1391
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=64c68080da429edf30a9857e3a698cb9ed335bd3;p=thirdparty%2Fqemu.git

Add comment to windows SCSI hack.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5295 c046a42c-6fe2-441c-8c8c-71466251a162
---

diff --git a/hw/lsi53c895a.c b/hw/lsi53c895a.c
index e45eefaef7b..53a2add0df0 100644
--- a/hw/lsi53c895a.c
+++ b/hw/lsi53c895a.c
@@ -1199,6 +1199,11 @@ again:
         }
     }
     if (insn_processed > 10000 && !s->waiting) {
+        /* Some windows drivers make the device spin waiting for a memory
+           location to change.  If we have been executed a lot of code then
+           assume this is the case and force an unexpected device disconnect.
+           This is apparently sufficient to beat the drivers into submission.
+         */
         if (!(s->sien0 & LSI_SIST0_UDC))
             fprintf(stderr, "inf. loop with UDC masked\n");
         lsi_script_scsi_interrupt(s, LSI_SIST0_UDC, 0);