rds: rds_rm_zerocopy_callback() use list_first_entry()

[ 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@google.com>
Signed-off-by: Pietro Borrello <borrello@diag.uniroma1.it>
Link: https://lore.kernel.org/r/20230202-rds-zerocopy-v3-1-83b0df974f9a@diag.uniroma1.it
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/rds/message.c b/net/rds/message.c
index 44dbc61..9402bc9 100644 (file)
--- 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() */