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Date:   Fri, 23 Sep 2022 20:38:35 +0900
From:   Masahiro Yamada <>
To:, Christoph Hellwig <>,
        Marek Szyprowski <>,
        Robin Murphy <>,
Cc:     Guenter Roeck <>,,
        Masahiro Yamada <>,
        "Martin K. Petersen" <>,
        Ming Lin <>,
        Sagi Grimberg <>
Subject: [PATCH] lib/sg_pool: change module_init(sg_pool_init) to subsys_initcall

sg_alloc_table_chained() is called by several drivers, but if it is
called before sg_pool_init(), it results in a NULL pointer dereference
in sg_pool_alloc().

Since commit 9b1d6c895002 ("lib: scatterlist: move SG pool code from
SCSI driver to lib/sg_pool.c"), we rely on module_init(sg_pool_init)
is invoked before other module_init calls but this assumption is

I slightly changed the link order while Kbuild refactoring Kbuild,
then uncovered this issue. I should keep the current link order, but
depending on a specific call order among module_init is so fragine.

We usually define the init order by specifying *_initcall correctly,
or delay the driver probing by returning -EPROBE_DEFER.

Change module_initcall() to subsys_initcall(), and also delete the
pointless module_exit() because lib/sg_pool.c is always compiled as
built-in. (CONFIG_SG_POOL is bool)

Fixes: 9b1d6c895002 ("lib: scatterlist: move SG pool code from SCSI driver to lib/sg_pool.c")
Reported-by: Guenter Roeck <>
Reported-by: Marek Szyprowski <>
Signed-off-by: Masahiro Yamada <>

I am sending this to DMA subsystem because I did not find
a corresponding one for lib/sg_pool.c

 lib/sg_pool.c | 16 ++--------------
 1 file changed, 2 insertions(+), 14 deletions(-)

diff --git a/lib/sg_pool.c b/lib/sg_pool.c
index a0b1a52cd6f7..9bfe60ca3f37 100644
--- a/lib/sg_pool.c
+++ b/lib/sg_pool.c
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-only
-#include <linux/module.h>
+#include <linux/init.h>
 #include <linux/scatterlist.h>
 #include <linux/mempool.h>
 #include <linux/slab.h>
@@ -177,16 +177,4 @@ static __init int sg_pool_init(void)
 	return -ENOMEM;
-static __exit void sg_pool_exit(void)
-	int i;
-	for (i = 0; i < SG_MEMPOOL_NR; i++) {
-		struct sg_pool *sgp = sg_pools + i;
-		mempool_destroy(sgp->pool);
-		kmem_cache_destroy(sgp->slab);
-	}

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