On Fri, 2012-03-02 at 02:41 +0100, Dmitry Tarnyagin wrote:
> The code implements cw1200 TX queues, used for holding TX frames pending
> transmission. The code supports garbage collecting and accounting of the frames.
>
> Note that link_id_map here and in the rest of the code is used to track
> (ieee80211) power management state of connected stations in AP mode.
>
> Signed-off-by: Dmitry Tarnyagin <dmitry.tarnyagin@xxxxxxxxxxxxxx>
> ---
> drivers/staging/cw1200/queue.c | 584 ++++++++++++++++++++++++++++++++++++++++
> drivers/staging/cw1200/queue.h | 116 ++++++++
> 2 files changed, 700 insertions(+), 0 deletions(-)
> create mode 100644 drivers/staging/cw1200/queue.c
> create mode 100644 drivers/staging/cw1200/queue.h
>
> diff --git a/drivers/staging/cw1200/queue.c b/drivers/staging/cw1200/queue.c
> new file mode 100644
> index 0000000..014e6b2
> --- /dev/null
> +++ b/drivers/staging/cw1200/queue.c
> @@ -0,0 +1,584 @@
> +/*
> + * O(1) TX queue with built-in allocator for ST-Ericsson CW1200 drivers
> + *
> + * Copyright (c) 2010, ST-Ericsson
> + * Author: Dmitry Tarnyagin <dmitry.tarnyagin@xxxxxxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <net/mac80211.h>
> +#include <linux/sched.h>
> +#include "queue.h"
> +#include "cw1200.h"
> +#include "debug.h"
> +
> +/* private */ struct cw1200_queue_item
> +{
> + struct list_head head;
> + struct sk_buff *skb;
> + u32 packetID;
> + unsigned long queue_timestamp;
> + unsigned long xmit_timestamp;
> + struct cw1200_txpriv txpriv;
> + u8 generation;
> +};
> +
> +static inline void __cw1200_queue_lock(struct cw1200_queue *queue)
> +{
> + struct cw1200_queue_stats *stats = queue->stats;
> + if (queue->tx_locked_cnt++ == 0) {
Is there some common lock that prevents this getting corrupted? mac80211
and higher layers do not have any synchronisation between the different
TX queues, and you'll need to call this from a few places ... maybe it
needs to be atomic_t?
johannes
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