wifi: mac80211_hwsim: use 32-bit skb cookie

Commit Message

Johannes Berg July 13, 2022, 7:16 p.m. UTC

From: Johannes Berg <[e-mail]>

We won't really have enough skbs to need a 64-bit cookie,
and on 32-bit platforms storing the 64-bit cookie into the
void *rate_driver_data doesn't work anyway. Switch back to
using just a 32-bit cookie and uintptr_t for the type to
avoid compiler warnings about all this.

Fixes: 4ee186fa7e40 ("wifi: mac80211_hwsim: fix race condition in pending packet")
Signed-off-by: Johannes Berg <[e-mail]>
---
 drivers/net/wireless/mac80211_hwsim.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

Patch

diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 91440b0dc0cc..56dc0c6dab78 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -687,7 +687,7 @@  struct mac80211_hwsim_data {
 	bool ps_poll_pending;
 	struct dentry *debugfs;
 
-	atomic64_t pending_cookie;
+	atomic_t pending_cookie;
 	struct sk_buff_head pending;	/* packets pending */
 	/*
 	 * Only radios in the same group can communicate together (the
@@ -1358,7 +1358,7 @@  static void mac80211_hwsim_tx_frame_nl(struct ieee80211_hw *hw,
 	int i;
 	struct hwsim_tx_rate tx_attempts[IEEE80211_TX_MAX_RATES];
 	struct hwsim_tx_rate_flag tx_attempts_flags[IEEE80211_TX_MAX_RATES];
-	u64 cookie;
+	uintptr_t cookie;
 
 	if (data->ps != PS_DISABLED)
 		hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
@@ -1427,7 +1427,7 @@  static void mac80211_hwsim_tx_frame_nl(struct ieee80211_hw *hw,
 		goto nla_put_failure;
 
 	/* We create a cookie to identify this skb */
-	cookie = (u64)atomic64_inc_return(&data->pending_cookie);
+	cookie = atomic_inc_return(&data->pending_cookie);
 	info->rate_driver_data[0] = (void *)cookie;
 	if (nla_put_u64_64bit(skb, HWSIM_ATTR_COOKIE, cookie, HWSIM_ATTR_PAD))
 		goto nla_put_failure;
@@ -4207,10 +4207,10 @@  static int hwsim_tx_info_frame_received_nl(struct sk_buff *skb_2,
 	/* look for the skb matching the cookie passed back from user */
 	spin_lock_irqsave(&data2->pending.lock, flags);
 	skb_queue_walk_safe(&data2->pending, skb, tmp) {
-		u64 skb_cookie;
+		uintptr_t skb_cookie;
 
 		txi = IEEE80211_SKB_CB(skb);
-		skb_cookie = (u64)(uintptr_t)txi->rate_driver_data[0];
+		skb_cookie = (uintptr_t)txi->rate_driver_data[0];
 
 		if (skb_cookie == ret_skb_cookie) {
 			__skb_unlink(skb, &data2->pending);