From f39a4577695072b4f53bad7387bdf4856c89b745 Mon Sep 17 00:00:00 2001
From: Thomas Schoebel-Theuer <tst@1und1.de>
Date: Tue, 26 Jul 2022 14:13:00 +0200
Subject: [PATCH] bio: compensate bio_alloc error

---
 kernel/mars_bio.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/mars_bio.c b/kernel/mars_bio.c
index 1b36a556..835f6726 100644
--- a/kernel/mars_bio.c
+++ b/kernel/mars_bio.c
@@ -153,6 +153,7 @@ int make_bio(struct bio_brick *brick, void *data, int len, loff_t pos, struct bi
 	int bvec_count;
 	int rest_len = len;
 	int result_len = 0;
+	int ms = 0;
 	int status;
 	int i;
 	struct bio *bio = NULL;
@@ -198,10 +199,11 @@ int make_bio(struct bio_brick *brick, void *data, int len, loff_t pos, struct bi
 
 	MARS_IO("sector_offset = %d data = %p pos = %lld rest_len = %d page_offset = %d page_len = %d bvec_count = %d\n", sector_offset, data, pos, rest_len, page_offset, page_len, bvec_count);
 
+ retry_bio_alloc:
 	bio = bio_alloc(GFP_MARS, bvec_count);
-	status = -ENOMEM;
 	if (unlikely(!bio)) {
-		goto out;
+		msleep_backoff(&ms);
+		goto retry_bio_alloc;
 	}
 
 	for (i = 0; i < bvec_count && rest_len > 0; i++) {