From: Johannes Berg johannes.berg@intel.com
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 johannes.berg@intel.com Cc: Jeongik Cha jeongik@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/wireless/mac80211_hwsim.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)
--- a/drivers/net/wireless/mac80211_hwsim.c +++ b/drivers/net/wireless/mac80211_hwsim.c @@ -552,7 +552,7 @@ 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 @@ -1067,7 +1067,7 @@ static void mac80211_hwsim_tx_frame_nl(s 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); @@ -1136,7 +1136,7 @@ static void mac80211_hwsim_tx_frame_nl(s 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; @@ -3146,10 +3146,10 @@ static int hwsim_tx_info_frame_received_ /* 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);