linux-kernel - [PATCH] nvme-tcp: replace sg_init_marker() with sg_init

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Date:   Sat, 22 Oct 2022 19:46:36 +0200
From:   Nam Cao <namcaov@...il.com>
To:     kbusch@...nel.org, axboe@...com, hch@....de, sagi@...mberg.me
Cc:     namcaov@...il.com, linux-nvme@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] nvme-tcp: replace sg_init_marker() with sg_init_table()

In nvme_tcp_ddgst_update(), sg_init_marker() is called with an
uninitialized scatterlist. This is probably fine, but gcc complains:

  CC [M]  drivers/nvme/host/tcp.o
In file included from ./include/linux/dma-mapping.h:10,
                 from ./include/linux/skbuff.h:31,
                 from ./include/net/net_namespace.h:43,
                 from ./include/linux/netdevice.h:38,
                 from ./include/net/sock.h:46,
                 from drivers/nvme/host/tcp.c:12:
In function ‘sg_mark_end’,
    inlined from ‘sg_init_marker’ at ./include/linux/scatterlist.h:356:2,
    inlined from ‘nvme_tcp_ddgst_update’ at drivers/nvme/host/tcp.c:390:2:
./include/linux/scatterlist.h:234:11: error: ‘sg.page_link’ is used uninitialized [-Werror=uninitialized]
  234 |         sg->page_link |= SG_END;
      |         ~~^~~~~~~~~~~
drivers/nvme/host/tcp.c: In function ‘nvme_tcp_ddgst_update’:
drivers/nvme/host/tcp.c:388:28: note: ‘sg’ declared here
  388 |         struct scatterlist sg;
      |                            ^~
cc1: all warnings being treated as errors

Use sg_init_table() instead, which basically memset the scatterlist to
zero first before calling sg_init_marker().

Signed-off-by: Nam Cao <namcaov@...il.com>
---
 drivers/nvme/host/tcp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 1eed0fc26b3a..dc2def86076d 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -387,7 +387,7 @@ static inline void nvme_tcp_ddgst_update(struct ahash_request *hash,
 {
 	struct scatterlist sg;
 
-	sg_init_marker(&sg, 1);
+	sg_init_table(&sg, 1);
 	sg_set_page(&sg, page, len, off);
 	ahash_request_set_crypt(hash, &sg, NULL, len);
 	crypto_ahash_update(hash);
-- 
2.25.1