From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from c60.cesmail.net ([216.154.195.49]:9763 "EHLO c60.cesmail.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750919Ab0AaAzi (ORCPT ); Sat, 30 Jan 2010 19:55:38 -0500 Subject: [PATCH 2/2] mac80211: reduce stack usage in sta_agg_status_read() To: linux-wireless@vger.kernel.org, "John W. Linville" From: Pavel Roskin Date: Sat, 30 Jan 2010 19:55:27 -0500 Message-ID: <20100131005527.22303.97956.stgit@mj.roinet.com> In-Reply-To: <20100131005509.22303.74752.stgit@mj.roinet.com> References: <20100131005509.22303.74752.stgit@mj.roinet.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-wireless-owner@vger.kernel.org List-ID: 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 --- net/mac80211/debugfs_sta.c | 24 +++++++++++++----------- 1 files changed, 13 insertions(+), 11 deletions(-) diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c index 84865e7..d92800b 100644 --- a/net/mac80211/debugfs_sta.c +++ b/net/mac80211/debugfs_sta.c @@ -120,36 +120,38 @@ STA_OPS(last_seq_ctrl); static ssize_t sta_agg_status_read(struct file *file, char __user *userbuf, size_t count, loff_t *ppos) { - char buf[30 + STA_TID_NUM * 70], *p = buf; + char buf[64 + STA_TID_NUM * 40], *p = buf; int i; struct sta_info *sta = file->private_data; spin_lock_bh(&sta->lock); - p += scnprintf(p, sizeof(buf)+buf-p, "next dialog_token is %#02x\n", + p += scnprintf(p, sizeof(buf) + buf - p, "next dialog_token: %#02x\n", sta->ampdu_mlme.dialog_token_allocator + 1); + p += scnprintf(p, sizeof(buf) + buf - p, + "TID\t\tRX\tDTKN\tSSN\t\tTX\tDTKN\tSSN\tpending\n"); for (i = 0; i < STA_TID_NUM; i++) { - p += scnprintf(p, sizeof(buf)+buf-p, "TID %02d:", i); - p += scnprintf(p, sizeof(buf)+buf-p, " RX=%x", + p += scnprintf(p, sizeof(buf) + buf - p, "%02d", i); + p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x", sta->ampdu_mlme.tid_state_rx[i]); - p += scnprintf(p, sizeof(buf)+buf-p, "/DTKN=%#.2x", + p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x", sta->ampdu_mlme.tid_state_rx[i] ? sta->ampdu_mlme.tid_rx[i]->dialog_token : 0); - p += scnprintf(p, sizeof(buf)+buf-p, "/SSN=%#.3x", + p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.3x", sta->ampdu_mlme.tid_state_rx[i] ? sta->ampdu_mlme.tid_rx[i]->ssn : 0); - p += scnprintf(p, sizeof(buf)+buf-p, " TX=%x", + p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x", sta->ampdu_mlme.tid_state_tx[i]); - p += scnprintf(p, sizeof(buf)+buf-p, "/DTKN=%#.2x", + p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x", sta->ampdu_mlme.tid_state_tx[i] ? sta->ampdu_mlme.tid_tx[i]->dialog_token : 0); - p += scnprintf(p, sizeof(buf)+buf-p, "/SSN=%#.3x", + p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.3x", sta->ampdu_mlme.tid_state_tx[i] ? sta->ampdu_mlme.tid_tx[i]->ssn : 0); - p += scnprintf(p, sizeof(buf)+buf-p, "/pending=%03d", + p += scnprintf(p, sizeof(buf) + buf - p, "\t%03d", sta->ampdu_mlme.tid_state_tx[i] ? skb_queue_len(&sta->ampdu_mlme.tid_tx[i]->pending) : 0); - p += scnprintf(p, sizeof(buf)+buf-p, "\n"); + p += scnprintf(p, sizeof(buf) + buf - p, "\n"); } spin_unlock_bh(&sta->lock);