[src/trunk]: src/sys/dev/ic Gah. Bad port from FreeBSD code (thanks Robert El...

[mjacob <mjacob%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/d43958e520dc
branches:  trunk
changeset: 494493:d43958e520dc
user:      mjacob <mjacob%NetBSD.org@localhost>
date:      Fri Jul 07 03:14:53 2000 +0000

description:
Gah. Bad port from FreeBSD code (thanks Robert Elz) for setting
up default timeout for watchdogging commands.

diffstat:

 sys/dev/ic/isp_netbsd.c |  21 +++++++++++++++++++--
 1 files changed, 19 insertions(+), 2 deletions(-)

diffs (35 lines):

diff -r 610e93ef8d48 -r d43958e520dc sys/dev/ic/isp_netbsd.c
--- a/sys/dev/ic/isp_netbsd.c   Fri Jul 07 02:50:19 2000 +0000
+++ b/sys/dev/ic/isp_netbsd.c   Fri Jul 07 03:14:53 2000 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: isp_netbsd.c,v 1.26 2000/07/05 22:23:05 mjacob Exp $ */
+/* $NetBSD: isp_netbsd.c,v 1.27 2000/07/07 03:14:53 mjacob Exp $ */
 /*
  * Platform (NetBSD) dependent common attachment code for Qlogic adapters.
  * Matthew Jacob <mjacob%nas.nasa.gov@localhost>
@@ -33,7 +33,24 @@
 #include <dev/ic/isp_netbsd.h>
 #include <sys/scsiio.h>
 
-#define        _XT(xs) ((((xs)->timeout + 999)/1000) + (2 * hz))
+
+/*
+ * Set a timeout for the watchdogging of a command.
+ *
+ * The dimensional analysis is
+ *
+ *     milliseconds * (seconds/millisecond) * (ticks/second) = ticks
+ *
+ *                     =
+ *
+ *     (milliseconds / 1000) * hz = ticks
+ *
+ *
+ * For timeouts less than 1 second, we'll get zero. Because of this, and
+ * because we want to establish *our* timeout to be longer than what the
+ * firmware might do, we just add 3 seconds at the back end.
+ */
+#define        _XT(xs) ((((xs)->timeout/1000) * hz) + (3 * hz))
 
 static void ispminphys __P((struct buf *));
 static int32_t ispcmd_slow __P((ISP_SCSI_XFER_T *));