[418/622] lnet: Detach rspt when md_threshold is infinite

Commit Message

James Simmons Feb. 27, 2020, 9:14 p.m. UTC

From: Chris Horn <[e-mail]>

MDs for pings use the infinite threshold on MD operations.
As such they aren't normally unlinkable as determined by
lnet_md_unlinkable(). We can cover this case by checking whether the
refcount is zero and threshold is LNET_MD_THRESH_INF.

Cray-bug-id: LUS-7366
WC-bug-id: https://jira.whamcloud.com/browse/LU-12441
Lustre-commit: ebbf909a1c2d ("LU-12441 lnet: Detach rspt when md_threshold is infinite")
Signed-off-by: Chris Horn <[e-mail]>
Reviewed-on: https://review.whamcloud.com/35452
Reviewed-by: Alexandr Boyko <[e-mail]>
Reviewed-by: Amir Shehata <[e-mail]>
Reviewed-by: Oleg Drokin <[e-mail]>
Signed-off-by: James Simmons <[e-mail]>
---
 net/lnet/lnet/lib-msg.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Patch

diff --git a/net/lnet/lnet/lib-msg.c b/net/lnet/lnet/lib-msg.c
index b70a6c9..805d5b9 100644
--- a/net/lnet/lnet/lib-msg.c
+++ b/net/lnet/lnet/lib-msg.c
@@ -825,10 +825,12 @@ 
 		lnet_eq_enqueue_event(md->md_eq, &msg->msg_ev);
 	}
 
-	if (unlink) {
+	if (unlink || (md->md_refcount == 0 &&
+		       md->md_threshold == LNET_MD_THRESH_INF))
 		lnet_detach_rsp_tracker(md, cpt);
+
+	if (unlink)
 		lnet_md_unlink(md);
-	}
 
 	msg->msg_md = NULL;
 }