ioat(4): Assert against ring underflow

svn path=/head/; revision=302683
2016-07-12 21:56:57 +00:00 · 2016-07-12 21:56:57 +00:00 · 3b188a672f · 2020-12-20 02:59:44 +00:00
commit 3b188a672f
parent 08a6b96aa5
1 changed files with 5 additions and 0 deletions
--- a/sys/dev/ioat/ioat.c
+++ b/sys/dev/ioat/ioat.c
@ -702,6 +702,11 @@ ioat_process_events(struct ioat_softc *ioat)
 		ioat->tail++;
 		if (desc->hw_desc_bus_addr == status)
 			break;
+
+		KASSERT(ioat_get_active(ioat) > 0, ("overrunning ring t:%u "
+		    "h:%u st:0x%016lx last_seen:%016lx completed:%u\n",
+		    ioat->tail, ioat->head, comp_update, ioat->last_seen,
+		    completed));
 	}

 	ioat->last_seen = desc->hw_desc_bus_addr;