From 6041e2a08c50e3fcaf1e56422bfafda62c597cea Mon Sep 17 00:00:00 2001
From: Larry Finger <Larry.Finger@lwfinger.net>
Date: Sun, 3 Aug 2008 17:58:36 -0500
Subject: [PATCH] p54: Fix potential concurrent access to private data
Experience with the rtl8187 driver has shown that mac80211 can make
calls to the config callback routine in rapid succession. This patch
creates a mutex that protects the private data in several of the routines
called by mac80211.
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---
drivers/net/wireless/p54/p54.h | 1 +
drivers/net/wireless/p54/p54common.c | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/drivers/net/wireless/p54/p54.h b/drivers/net/wireless/p54/p54.h
index c6f27b9022f9..cac9a515b82d 100644
--- a/drivers/net/wireless/p54/p54.h
+++ b/drivers/net/wireless/p54/p54.h
@@ -52,6 +52,7 @@ struct p54_common {
int (*open)(struct ieee80211_hw *dev);
void (*stop)(struct ieee80211_hw *dev);
int mode;
+ struct mutex conf_mutex;
u8 mac_addr[ETH_ALEN];
u8 bssid[ETH_ALEN];
struct pda_iq_autocal_entry *iq_autocal;
diff --git a/drivers/net/wireless/p54/p54common.c b/drivers/net/wireless/p54/p54common.c
index ffaf7a6b6810..4da89ea9b561 100644
--- a/drivers/net/wireless/p54/p54common.c
+++ b/drivers/net/wireless/p54/p54common.c
@@ -886,9 +886,12 @@ static void p54_remove_interface(struct ieee80211_hw *dev,
static int p54_config(struct ieee80211_hw *dev, struct ieee80211_conf *conf)
{
int ret;
+ struct p54_common *priv = dev->priv;
+ mutex_lock(&priv->conf_mutex);
ret = p54_set_freq(dev, cpu_to_le16(conf->channel->center_freq));
p54_set_vdcf(dev);
+ mutex_unlock(&priv->conf_mutex);
return ret;
}
@@ -898,10 +901,12 @@ static int p54_config_interface(struct ieee80211_hw *dev,
{
struct p54_common *priv = dev->priv;
+ mutex_lock(&priv->conf_mutex);
p54_set_filter(dev, 0, priv->mac_addr, conf->bssid, 0, 1, 0, 0xF642);
p54_set_filter(dev, 0, priv->mac_addr, conf->bssid, 2, 0, 0, 0);
p54_set_leds(dev, 1, !is_multicast_ether_addr(conf->bssid), 0);
memcpy(priv->bssid, conf->bssid, ETH_ALEN);
+ mutex_unlock(&priv->conf_mutex);
return 0;
}
@@ -1009,6 +1014,7 @@ struct ieee80211_hw *p54_init_common(size_t priv_data_len)
}
p54_init_vdcf(dev);
+ mutex_init(&priv->conf_mutex);
return dev;
}
--
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