ref: f9df0bd2821c302cb13b694842e802cd9e2bc402
parent: 2cd313668cea156fd13b54873d7934d9b15d8081
author: cinap_lenrek <cinap_lenrek@felloff.net>
date: Fri Oct 21 07:06:35 EDT 2022
kernel: fix freeb() for custom pools Some ethernet drivers like ethervt6105M maintain a custom pool of Blocks using Block.free callback. To maintain that Block.list pointer is nil when reused, we have to clear it before returning it to the custom pool as the custom pool code is not aware of it. Also, poison Block.list pointer before free().
--- a/sys/src/9/port/allocb.c
+++ b/sys/src/9/port/allocb.c
@@ -107,6 +107,9 @@
* pool of uncached buffers and provide their own free routine.
*/
if(b->free != nil) {+ b->next = nil;
+ b->list = nil;
+
b->free(b);
return;
}
@@ -113,6 +116,7 @@
/* poison the block in case someone is still holding onto it */
b->next = dead;
+ b->list = dead;
b->rp = dead;
b->wp = dead;
b->lim = dead;