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authorChristian Lamparter <chunkeey@web.de>2009-03-06 00:53:59 +0100
committerJohn W. Linville <linville@tuxdriver.com>2009-03-06 15:54:32 -0500
commitc0350024723b4a69e38655816484d934aca8eb30 (patch)
tree3c7ab2ba6f97daf654249fb4ed98f3b1922955a9 /drivers
parentbd05f28e1a15ae62994fe309a524695fe26dd834 (diff)
downloadop-kernel-dev-c0350024723b4a69e38655816484d934aca8eb30.zip
op-kernel-dev-c0350024723b4a69e38655816484d934aca8eb30.tar.gz
p54: fix race condition in memory management
This patch fixes a number of race conditions in the driver. Up until now, "entry" pointer was initialized before acquiring the right lock. Signed-off-by: Christian Lamparter <chunkeey@web.de> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/wireless/p54/p54common.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/net/wireless/p54/p54common.c b/drivers/net/wireless/p54/p54common.c
index 34561e6..f170106 100644
--- a/drivers/net/wireless/p54/p54common.c
+++ b/drivers/net/wireless/p54/p54common.c
@@ -710,10 +710,11 @@ static struct sk_buff *p54_find_tx_entry(struct ieee80211_hw *dev,
__le32 req_id)
{
struct p54_common *priv = dev->priv;
- struct sk_buff *entry = priv->tx_queue.next;
+ struct sk_buff *entry;
unsigned long flags;
spin_lock_irqsave(&priv->tx_queue.lock, flags);
+ entry = priv->tx_queue.next;
while (entry != (struct sk_buff *)&priv->tx_queue) {
struct p54_hdr *hdr = (struct p54_hdr *) entry->data;
@@ -732,7 +733,7 @@ static void p54_rx_frame_sent(struct ieee80211_hw *dev, struct sk_buff *skb)
struct p54_common *priv = dev->priv;
struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
struct p54_frame_sent *payload = (struct p54_frame_sent *) hdr->data;
- struct sk_buff *entry = (struct sk_buff *) priv->tx_queue.next;
+ struct sk_buff *entry;
u32 addr = le32_to_cpu(hdr->req_id) - priv->headroom;
struct memrecord *range = NULL;
u32 freed = 0;
@@ -741,6 +742,7 @@ static void p54_rx_frame_sent(struct ieee80211_hw *dev, struct sk_buff *skb)
int count, idx;
spin_lock_irqsave(&priv->tx_queue.lock, flags);
+ entry = (struct sk_buff *) priv->tx_queue.next;
while (entry != (struct sk_buff *)&priv->tx_queue) {
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(entry);
struct p54_hdr *entry_hdr;
@@ -976,7 +978,7 @@ static int p54_assign_address(struct ieee80211_hw *dev, struct sk_buff *skb,
struct p54_hdr *data, u32 len)
{
struct p54_common *priv = dev->priv;
- struct sk_buff *entry = priv->tx_queue.next;
+ struct sk_buff *entry;
struct sk_buff *target_skb = NULL;
struct ieee80211_tx_info *info;
struct memrecord *range;
@@ -1014,6 +1016,7 @@ static int p54_assign_address(struct ieee80211_hw *dev, struct sk_buff *skb,
}
}
+ entry = priv->tx_queue.next;
while (left--) {
u32 hole_size;
info = IEEE80211_SKB_CB(entry);
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