From 6f3342a5e83c7687308999ffa138161c0acd86c9 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Wed, 13 Jul 2022 21:16:45 +0200 Subject: [PATCH] wifi: mac80211_hwsim: use 32-bit skb cookie commit cc5250cdb43d444061412df7fae72d2b4acbdf97 upstream. 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 Cc: Jeongik Cha Signed-off-by: Greg Kroah-Hartman --- drivers/net/wireless/mac80211_hwsim.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c index 1e7d2ef3de0a..6b0ad6b4dd4b 100644 --- a/drivers/net/wireless/mac80211_hwsim.c +++ b/drivers/net/wireless/mac80211_hwsim.c @@ -527,7 +527,7 @@ 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 @@ -1044,7 +1044,7 @@ 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); @@ -1113,7 +1113,7 @@ 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; @@ -3286,10 +3286,10 @@ 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);