From 34013933f06f31312660695d681db0d9b9defce3 Mon Sep 17 00:00:00 2001
From: Thomas Schoebel-Theuer <tst@1und1.de>
Date: Tue, 23 Aug 2022 11:50:37 +0200
Subject: [PATCH] lib_log: safeguard suspected coherence problems 2

---
 kernel/lib_log.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/lib_log.c b/kernel/lib_log.c
index efb99917..c19f6743 100644
--- a/kernel/lib_log.c
+++ b/kernel/lib_log.c
@@ -720,6 +720,8 @@ int _check_crc(struct log_header *lh,
 			 check_flags, crc_len);
 		check_flags |= usable_digest_mask;
 		cond_resched();
+		/* safeguard any suspected coherence problems */
+		smp_mb();
 		goto retry;
 	}
 	/* when simple retry failed: try the painful iterative method */
@@ -747,6 +749,8 @@ int _check_crc(struct log_header *lh,
 			goto failed;
 		did_iterative_retry++;
 		cond_resched();
+		/* safeguard any suspected coherence problems */
+		smp_mb();
 		goto retry;
 	failed:
 		MARS_WRN("ITERATIVE RETRY %d failed\n",