[PATCH 4.19 49/89] rds: rds_rm_zerocopy_callback() use list_first_entry()

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From: Pietro Borrello <borrello@xxxxxxxxxxxxxxxx>

[ Upstream commit f753a68980cf4b59a80fe677619da2b1804f526d ]

rds_rm_zerocopy_callback() uses list_entry() on the head of a list
causing a type confusion.
Use list_first_entry() to actually access the first element of the
rs_zcookie_queue list.

Fixes: 9426bbc6de99 ("rds: use list structure to track information for zerocopy completion notification")
Reviewed-by: Willem de Bruijn <willemb@xxxxxxxxxx>
Signed-off-by: Pietro Borrello <borrello@xxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230202-rds-zerocopy-v3-1-83b0df974f9a@xxxxxxxxxxxxxxxx
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 net/rds/message.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/rds/message.c b/net/rds/message.c
index 4b00b1152a5f0..309b54cc62ae3 100644
--- a/net/rds/message.c
+++ b/net/rds/message.c
@@ -104,9 +104,9 @@ static void rds_rm_zerocopy_callback(struct rds_sock *rs,
 	spin_lock_irqsave(&q->lock, flags);
 	head = &q->zcookie_head;
 	if (!list_empty(head)) {
-		info = list_entry(head, struct rds_msg_zcopy_info,
-				  rs_zcookie_next);
-		if (info && rds_zcookie_add(info, cookie)) {
+		info = list_first_entry(head, struct rds_msg_zcopy_info,
+					rs_zcookie_next);
+		if (rds_zcookie_add(info, cookie)) {
 			spin_unlock_irqrestore(&q->lock, flags);
 			kfree(rds_info_from_znotifier(znotif));
 			/* caller invokes rds_wake_sk_sleep() */
-- 
2.39.0






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