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Commit e0b20f1c authored by Pavel Roskin's avatar Pavel Roskin Committed by John W. Linville
Browse files

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: default avatarPavel Roskin <proski@gnu.org>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 4c82bf8e

net/mac80211/debugfs_sta.c

+13 −11
Original line number Diff line number Diff line
@@ -120,33 +120,35 @@ 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");