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diff --git a/sys/kern/kern_osd.c b/sys/kern/kern_osd.c
--- a/sys/kern/kern_osd.c
+++ b/sys/kern/kern_osd.c
@@ -112,7 +112,7 @@
for (i = 0; i < osdm[type].osd_ntslots; i++) {
if (osdm[type].osd_destructors[i] == NULL) {
OSD_DEBUG("Unused slot found (type=%u, slot=%u).",
- type, i);
+ type, i + 1);
break;
}
}
@@ -166,32 +166,18 @@
LIST_FOREACH_SAFE(osd, &osdm[type].osd_list, osd_next, tosd)
do_osd_del(type, osd, slot, 1);
mtx_unlock(&osdm[type].osd_list_lock);
+
/*
- * Set destructor to NULL to free the slot.
+ * Set destructor to NULL to free the slot. We don't bother actually
+ * freeing any memory here because we'll gracefully reuse any freed
+ * slots, and reallocating the arrays as a smaller chunk of memory isn't
+ * actually guaranteed to succeed. As such, we'll err on the side of
+ * caution and just leave it be since these are generally modestly sized
+ * allocations.
*/
osdm[type].osd_destructors[slot - 1] = NULL;
- if (slot == osdm[type].osd_ntslots) {
- osdm[type].osd_ntslots--;
- osdm[type].osd_destructors = realloc(osdm[type].osd_destructors,
- sizeof(osd_destructor_t) * osdm[type].osd_ntslots, M_OSD,
- M_NOWAIT | M_ZERO);
- if (osdm[type].osd_nmethods != 0)
- osdm[type].osd_methods = realloc(osdm[type].osd_methods,
- sizeof(osd_method_t) * osdm[type].osd_ntslots *
- osdm[type].osd_nmethods, M_OSD, M_NOWAIT | M_ZERO);
- /*
- * We always reallocate to smaller size, so we assume it will
- * always succeed.
- */
- KASSERT(osdm[type].osd_destructors != NULL &&
- (osdm[type].osd_nmethods == 0 ||
- osdm[type].osd_methods != NULL), ("realloc() failed"));
- OSD_DEBUG("Deregistration of the last slot (type=%u, slot=%u).",
- type, slot);
- } else {
- OSD_DEBUG("Slot deregistration (type=%u, slot=%u).",
- type, slot);
- }
+ OSD_DEBUG("Slot deregistration (type=%u, slot=%u).", type, slot);
+
rm_wunlock(&osdm[type].osd_object_lock);
sx_xunlock(&osdm[type].osd_module_lock);
}

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