mac80211: reduce stack usage in sta_agg_status_read()
Use a more compact and readable format for "agg_status" to reduce the stack frame to less than 1024 bytes. Signed-off-by: Pavel Roskin <proski@gnu.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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@ -120,36 +120,38 @@ STA_OPS(last_seq_ctrl);
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static ssize_t sta_agg_status_read(struct file *file, char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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char buf[30 + STA_TID_NUM * 70], *p = buf;
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char buf[64 + STA_TID_NUM * 40], *p = buf;
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int i;
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struct sta_info *sta = file->private_data;
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spin_lock_bh(&sta->lock);
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p += scnprintf(p, sizeof(buf)+buf-p, "next dialog_token is %#02x\n",
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p += scnprintf(p, sizeof(buf) + buf - p, "next dialog_token: %#02x\n",
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sta->ampdu_mlme.dialog_token_allocator + 1);
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p += scnprintf(p, sizeof(buf) + buf - p,
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"TID\t\tRX\tDTKN\tSSN\t\tTX\tDTKN\tSSN\tpending\n");
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for (i = 0; i < STA_TID_NUM; i++) {
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p += scnprintf(p, sizeof(buf)+buf-p, "TID %02d:", i);
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p += scnprintf(p, sizeof(buf)+buf-p, " RX=%x",
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p += scnprintf(p, sizeof(buf) + buf - p, "%02d", i);
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p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x",
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sta->ampdu_mlme.tid_state_rx[i]);
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p += scnprintf(p, sizeof(buf)+buf-p, "/DTKN=%#.2x",
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p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x",
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sta->ampdu_mlme.tid_state_rx[i] ?
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sta->ampdu_mlme.tid_rx[i]->dialog_token : 0);
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p += scnprintf(p, sizeof(buf)+buf-p, "/SSN=%#.3x",
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p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.3x",
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sta->ampdu_mlme.tid_state_rx[i] ?
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sta->ampdu_mlme.tid_rx[i]->ssn : 0);
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p += scnprintf(p, sizeof(buf)+buf-p, " TX=%x",
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p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x",
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sta->ampdu_mlme.tid_state_tx[i]);
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p += scnprintf(p, sizeof(buf)+buf-p, "/DTKN=%#.2x",
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p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x",
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sta->ampdu_mlme.tid_state_tx[i] ?
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sta->ampdu_mlme.tid_tx[i]->dialog_token : 0);
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p += scnprintf(p, sizeof(buf)+buf-p, "/SSN=%#.3x",
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p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.3x",
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sta->ampdu_mlme.tid_state_tx[i] ?
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sta->ampdu_mlme.tid_tx[i]->ssn : 0);
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p += scnprintf(p, sizeof(buf)+buf-p, "/pending=%03d",
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p += scnprintf(p, sizeof(buf) + buf - p, "\t%03d",
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sta->ampdu_mlme.tid_state_tx[i] ?
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skb_queue_len(&sta->ampdu_mlme.tid_tx[i]->pending) : 0);
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p += scnprintf(p, sizeof(buf)+buf-p, "\n");
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p += scnprintf(p, sizeof(buf) + buf - p, "\n");
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}
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spin_unlock_bh(&sta->lock);
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