netdev - [PATCH v2 2/3] net: thunderbolt: Fix sparse warnings in tbnet_xmit_csum_and

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Date:   Tue, 11 Apr 2023 12:10:48 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Simon Horman <simon.horman@...igine.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        netdev@...r.kernel.org
Subject: [PATCH v2 2/3] net: thunderbolt: Fix sparse warnings in tbnet_xmit_csum_and_map()

Fixes the following warning when the driver is built with sparse checks
enabled:

main.c:993:23: warning: incorrect type in initializer (different base types)
main.c:993:23:    expected restricted __wsum [usertype] wsum
main.c:993:23:    got restricted __be32 [usertype]

No functional changes intended.

Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Reviewed-by: Simon Horman <simon.horman@...igine.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/net/thunderbolt/main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/thunderbolt/main.c b/drivers/net/thunderbolt/main.c
index 27f8573a2b6e..6a43ced74881 100644
--- a/drivers/net/thunderbolt/main.c
+++ b/drivers/net/thunderbolt/main.c
@@ -991,8 +991,10 @@ static bool tbnet_xmit_csum_and_map(struct tbnet *net, struct sk_buff *skb,
 {
 	struct thunderbolt_ip_frame_header *hdr = page_address(frames[0]->page);
 	struct device *dma_dev = tb_ring_dma_device(net->tx_ring.ring);
-	__wsum wsum = htonl(skb->len - skb_transport_offset(skb));
 	unsigned int i, len, offset = skb_transport_offset(skb);
+	/* Remove payload length from checksum */
+	u32 paylen = skb->len - skb_transport_offset(skb);
+	__wsum wsum = (__force __wsum)htonl(paylen);
 	__be16 protocol = skb->protocol;
 	void *data = skb->data;
 	void *dest = hdr + 1;
-- 
2.39.2