Ack!

sometime around 1.51, the check for minphys dissappeared out of
transfers for disks..
we weren't hecking that the adapter could handle a transfer of
the size we were requesting..
Peter!?
 :)
this explains the rash of failures I've seen reported recently
with "too many DMA segments" on raw devices

(added one for st as well)

1 files changed, 13 insertions, 8 deletions

diff --git a/sys/scsi/sd.c b/sys/scsi/sd.c
index 71333cc..14438c9 100644
--- a/sys/scsi/sd.c
+++ b/sys/scsi/sd.c
@@ -14,7 +14,7 @@
  *
  * Ported to run under 386BSD by Julian Elischer (julian@dialix.oz.au) Sept 1992
  *
- *      $Id: sd.c,v 1.65 1995/05/30 08:13:51 rgrimes Exp $
+ *      $Id: sd.c,v 1.66 1995/08/07 11:56:31 davidg Exp $
  */
 
 #define SPLSD splbio
@@ -93,18 +93,18 @@ SCSI_DEVICE_ENTRIES(sd)
 
 struct scsi_device sd_switch =
 {
-    sd_sense_handler,
-    sdstart,			/* have a queue, served by this */
-    NULL,			/* have no async handler */
-    NULL,			/* Use default 'done' routine */
-    "sd",
-    0,
+	sd_sense_handler,
+	sdstart,			/* have a queue, served by this */
+	NULL,			/* have no async handler */
+	NULL,			/* Use default 'done' routine */
+	"sd",
+	0,
 	{0, 0},
 	0,				/* Link flags */
 	sdattach,
 	"Direct-Access",
 	sdopen,
-    sizeof(struct scsi_data),
+	sizeof(struct scsi_data),
 	T_DIRECT,
 	sdunit,
 	sdsetunit,
@@ -374,6 +374,11 @@ sd_strategy(struct buf *bp, struct scsi_link *sc_link)
 	}
 
 	/*
+	 * check it's not too big a transfer for our adapter
+	 */
+        scsi_minphys(bp,&sd_switch);
+
+	/*
 	 * Odd number of bytes
 	 */
 	if (bp->b_bcount % DEV_BSIZE != 0) {