From 75ab753d7704f0bd34e09d5e4081bc73fdddd775 Mon Sep 17 00:00:00 2001 From: Amitkumar Karwar Date: Fri, 17 May 2013 17:50:20 -0700 Subject: [PATCH] mwifiex: remove global user_scan_cfg variable As the variable is used only for preparation of internal scan commands, we don't need to keep it allocated until the entire scan completes. We will define it as a local variable and free immediately after it's use. New flag 'scan_aborting' is added to handle race between mwifiex_close() and scan handler. Previously user_scan_cfg pointer used to take care of this. This patch fixes a memory leak in mwifiex_cfg80211_scan after running "iwlist mlan0 scan & sleep 1; rmmod mwifiex_sdio". Reported-by: Daniel Drake Tested-by: Daniel Drake Signed-off-by: Amitkumar Karwar Signed-off-by: Bing Zhao Signed-off-by: John W. Linville --- drivers/net/wireless/mwifiex/cfg80211.c | 31 ++++++++++++++----------- drivers/net/wireless/mwifiex/init.c | 20 ++++++---------- drivers/net/wireless/mwifiex/main.c | 1 + drivers/net/wireless/mwifiex/main.h | 2 +- drivers/net/wireless/mwifiex/scan.c | 22 +++++++----------- 5 files changed, 34 insertions(+), 42 deletions(-) diff --git a/drivers/net/wireless/mwifiex/cfg80211.c b/drivers/net/wireless/mwifiex/cfg80211.c index d3c8ece980d8..fcd293c64118 100644 --- a/drivers/net/wireless/mwifiex/cfg80211.c +++ b/drivers/net/wireless/mwifiex/cfg80211.c @@ -1859,6 +1859,7 @@ mwifiex_cfg80211_scan(struct wiphy *wiphy, int i, offset, ret; struct ieee80211_channel *chan; struct ieee_types_header *ie; + struct mwifiex_user_scan_cfg *user_scan_cfg; wiphy_dbg(wiphy, "info: received scan request on %s\n", dev->name); @@ -1869,20 +1870,22 @@ mwifiex_cfg80211_scan(struct wiphy *wiphy, return -EBUSY; } - if (priv->user_scan_cfg) { + /* Block scan request if scan operation or scan cleanup when interface + * is disabled is in process + */ + if (priv->scan_request || priv->scan_aborting) { dev_err(priv->adapter->dev, "cmd: Scan already in process..\n"); return -EBUSY; } - priv->user_scan_cfg = kzalloc(sizeof(struct mwifiex_user_scan_cfg), - GFP_KERNEL); - if (!priv->user_scan_cfg) + user_scan_cfg = kzalloc(sizeof(*user_scan_cfg), GFP_KERNEL); + if (!user_scan_cfg) return -ENOMEM; priv->scan_request = request; - priv->user_scan_cfg->num_ssids = request->n_ssids; - priv->user_scan_cfg->ssid_list = request->ssids; + user_scan_cfg->num_ssids = request->n_ssids; + user_scan_cfg->ssid_list = request->ssids; if (request->ie && request->ie_len) { offset = 0; @@ -1902,25 +1905,25 @@ mwifiex_cfg80211_scan(struct wiphy *wiphy, for (i = 0; i < min_t(u32, request->n_channels, MWIFIEX_USER_SCAN_CHAN_MAX); i++) { chan = request->channels[i]; - priv->user_scan_cfg->chan_list[i].chan_number = chan->hw_value; - priv->user_scan_cfg->chan_list[i].radio_type = chan->band; + user_scan_cfg->chan_list[i].chan_number = chan->hw_value; + user_scan_cfg->chan_list[i].radio_type = chan->band; if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) - priv->user_scan_cfg->chan_list[i].scan_type = + user_scan_cfg->chan_list[i].scan_type = MWIFIEX_SCAN_TYPE_PASSIVE; else - priv->user_scan_cfg->chan_list[i].scan_type = + user_scan_cfg->chan_list[i].scan_type = MWIFIEX_SCAN_TYPE_ACTIVE; - priv->user_scan_cfg->chan_list[i].scan_time = 0; + user_scan_cfg->chan_list[i].scan_time = 0; } - ret = mwifiex_scan_networks(priv, priv->user_scan_cfg); + ret = mwifiex_scan_networks(priv, user_scan_cfg); + kfree(user_scan_cfg); if (ret) { dev_err(priv->adapter->dev, "scan failed: %d\n", ret); + priv->scan_aborting = false; priv->scan_request = NULL; - kfree(priv->user_scan_cfg); - priv->user_scan_cfg = NULL; return ret; } diff --git a/drivers/net/wireless/mwifiex/init.c b/drivers/net/wireless/mwifiex/init.c index 71bbf1204685..1343725f8c4c 100644 --- a/drivers/net/wireless/mwifiex/init.c +++ b/drivers/net/wireless/mwifiex/init.c @@ -81,19 +81,13 @@ static void scan_delay_timer_fn(unsigned long data) adapter->empty_tx_q_cnt = 0; spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags); - if (priv->user_scan_cfg) { - if (priv->scan_request) { - dev_dbg(priv->adapter->dev, - "info: aborting scan\n"); - cfg80211_scan_done(priv->scan_request, 1); - priv->scan_request = NULL; - } else { - dev_dbg(priv->adapter->dev, - "info: scan already aborted\n"); - } - - kfree(priv->user_scan_cfg); - priv->user_scan_cfg = NULL; + if (priv->scan_request) { + dev_dbg(adapter->dev, "info: aborting scan\n"); + cfg80211_scan_done(priv->scan_request, 1); + priv->scan_request = NULL; + } else { + priv->scan_aborting = false; + dev_dbg(adapter->dev, "info: scan already aborted\n"); } goto done; } diff --git a/drivers/net/wireless/mwifiex/main.c b/drivers/net/wireless/mwifiex/main.c index 121443a0f2a1..eb8518618622 100644 --- a/drivers/net/wireless/mwifiex/main.c +++ b/drivers/net/wireless/mwifiex/main.c @@ -436,6 +436,7 @@ mwifiex_close(struct net_device *dev) dev_dbg(priv->adapter->dev, "aborting scan on ndo_stop\n"); cfg80211_scan_done(priv->scan_request, 1); priv->scan_request = NULL; + priv->scan_aborting = true; } return 0; diff --git a/drivers/net/wireless/mwifiex/main.h b/drivers/net/wireless/mwifiex/main.h index 4ef67fca06d3..81251d91491c 100644 --- a/drivers/net/wireless/mwifiex/main.h +++ b/drivers/net/wireless/mwifiex/main.h @@ -492,7 +492,6 @@ struct mwifiex_private { struct semaphore async_sem; u8 report_scan_result; struct cfg80211_scan_request *scan_request; - struct mwifiex_user_scan_cfg *user_scan_cfg; u8 cfg_bssid[6]; struct wps wps; u8 scan_block; @@ -510,6 +509,7 @@ struct mwifiex_private { u8 ap_11ac_enabled; u32 mgmt_frame_mask; struct mwifiex_roc_cfg roc_cfg; + bool scan_aborting; }; enum mwifiex_ba_status { diff --git a/drivers/net/wireless/mwifiex/scan.c b/drivers/net/wireless/mwifiex/scan.c index 9cf5d8f07df8..7b2566b308c3 100644 --- a/drivers/net/wireless/mwifiex/scan.c +++ b/drivers/net/wireless/mwifiex/scan.c @@ -1784,22 +1784,16 @@ check_next_scan: if (priv->report_scan_result) priv->report_scan_result = false; - if (priv->user_scan_cfg) { - if (priv->scan_request) { - dev_dbg(priv->adapter->dev, - "info: notifying scan done\n"); - cfg80211_scan_done(priv->scan_request, 0); - priv->scan_request = NULL; - } else { - dev_dbg(priv->adapter->dev, - "info: scan already aborted\n"); - } - - kfree(priv->user_scan_cfg); - priv->user_scan_cfg = NULL; + if (priv->scan_request) { + dev_dbg(adapter->dev, "info: notifying scan done\n"); + cfg80211_scan_done(priv->scan_request, 0); + priv->scan_request = NULL; + } else { + priv->scan_aborting = false; + dev_dbg(adapter->dev, "info: scan already aborted\n"); } } else { - if (priv->user_scan_cfg && !priv->scan_request) { + if (priv->scan_aborting && !priv->scan_request) { spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags); adapter->scan_delay_cnt = MWIFIEX_MAX_SCAN_DELAY_CNT; -- 2.20.1