[PATCHv2] offchannel: Cancel the pending_action TX wait, before starting new one.

Jouni Malinen j at w1.fi
Sun Nov 22 11:15:08 PST 2015

On Mon, Nov 02, 2015 at 08:40:28PM +0530, Chaitanya T K wrote:
> From: tkc <chaitanya.mgit at gmail.com>
> Before the tx_status is received for the action frame, if we
> get another request, we respond to that by freeing the memory
> for pending_action_tx, but we don't cancel the TX wait, so
> in the kernel the ROC will not be cancelled.
> Due to above issue, wpa_supplicant assumes that all pending
> RoC's are cancelled and proceeds with interface creation and
> connection, where as state in mac80211/driver will be roc_in_progress.
> This is leading to issues at driver level.
> Signed-off-by: Chaitanya T K <chaitanya.mgit at gmail.com>
> ---
> V2: Fix 2 from's.
>     Remove the unnecessary braces.

I'm not sure I'd call that "From:" in the message body fixed (i.e., it
should have been the second one, not the first one; alternatively, it
would be fine to remove that From: line from the message body since the
one in the message header has a value matching that SOB).

> diff --git a/wpa_supplicant/offchannel.c b/wpa_supplicant/offchannel.c
> @@ -253,15 +253,9 @@ int offchannel_send_action(struct wpa_supplicant *wpa_s, unsigned int freq,
>  	wpa_s->pending_action_tx_status_cb = tx_cb;
> -	if (wpa_s->pending_action_tx) {
> -		wpa_printf(MSG_DEBUG, "Off-channel: Dropped pending Action "
> -			   "frame TX to " MACSTR " (pending_action_tx=%p)",
> -			   MAC2STR(wpa_s->pending_action_dst),
> -			   wpa_s->pending_action_tx);
> -		wpa_hexdump_buf(MSG_MSGDUMP, "Pending TX frame",
> -				wpa_s->pending_action_tx);
> -		wpabuf_free(wpa_s->pending_action_tx);
> -	}
> +	if (wpa_s->pending_action_tx)
> +		offchannel_send_action_done(wpa_s);

As noted in your reply to this, those debug prints should not be

As far as the change to offchannel_send_action_done() is concerned, I'm
not sure it is the correct thing to do in all cases. Why would we cancel
Action frame TX wait or remain-on-channel if the new frame is for the
same channel?

Jouni Malinen                                            PGP id EFC895FA

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