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iwlwifi: clean up some beacon handling 

There's no need to check for NULL before
calling dev_kfree_skb() since it is valid
to call it on NULL -- it becomes a no-op.

There's also no need to initialise the
beacon_skb variable to NULL just after
the memory it is in has been kzalloc'ed.

Some minor whitespace cleanups, and a
lock assertion in a function that needs
the mutex (to access the beacon_skb var)
complete the patch.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
This commit is contained in:
Johannes Berg 2010-10-04 05:50:36 -07:00 committed by Wey-Yi Guy
parent 12e934dc60
commit 77834543a5
1 changed files with 11 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/net/wireless/iwlwifi/iwl-agn.c
View File

@ -314,9 +314,11 @@ static void iwl_free_frame(struct iwl_priv *priv, struct iwl_frame *frame)
}
static u32 iwl_fill_beacon_frame(struct iwl_priv *priv,
struct ieee80211_hdr *hdr,
int left)
struct ieee80211_hdr *hdr,
int left)
{
lockdep_assert_held(&priv->mutex);
if (!priv->beacon_skb)
return 0;
@ -330,8 +332,8 @@ static u32 iwl_fill_beacon_frame(struct iwl_priv *priv,
/* Parse the beacon frame to find the TIM element and set tim_idx & tim_size */
static void iwl_set_beacon_tim(struct iwl_priv *priv,
struct iwl_tx_beacon_cmd *tx_beacon_cmd,
u8 *beacon, u32 frame_size)
struct iwl_tx_beacon_cmd *tx_beacon_cmd,
u8 *beacon, u32 frame_size)
{
u16 tim_idx;
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)beacon;
@ -393,7 +395,7 @@ static unsigned int iwl_hw_get_beacon_cmd(struct iwl_priv *priv,
/* Set up TX beacon command fields */
iwl_set_beacon_tim(priv, tx_beacon_cmd, (u8 *)tx_beacon_cmd->frame,
frame_size);
frame_size);
/* Set up packet rate and flags */
rate = iwl_rate_get_lowest_plcp(priv, priv->beacon_ctx);
@ -648,13 +650,12 @@ static void iwl_bg_beacon_update(struct work_struct *work)
/* Pull updated AP beacon from mac80211. will fail if not in AP mode */
beacon = ieee80211_beacon_get(priv->hw, priv->beacon_ctx->vif);
if (!beacon) {
IWL_ERR(priv, "update beacon failed\n");
IWL_ERR(priv, "update beacon failed -- keeping old\n");
goto out;
}
/* new beacon skb is allocated every time; dispose previous.*/
if (priv->beacon_skb)
dev_kfree_skb(priv->beacon_skb);
dev_kfree_skb(priv->beacon_skb);
priv->beacon_skb = beacon;
@ -2993,8 +2994,7 @@ static void __iwl_down(struct iwl_priv *priv)
exit:
memset(&priv->card_alive, 0, sizeof(struct iwl_alive_resp));
if (priv->beacon_skb)
dev_kfree_skb(priv->beacon_skb);
dev_kfree_skb(priv->beacon_skb);
priv->beacon_skb = NULL;
/* clear out any free frames */
@ -4131,8 +4131,6 @@ static int iwl_init_drv(struct iwl_priv *priv)
{
int ret;
priv->beacon_skb = NULL;
spin_lock_init(&priv->sta_lock);
spin_lock_init(&priv->hcmd_lock);
@ -4645,8 +4643,7 @@ static void __devexit iwl_pci_remove(struct pci_dev *pdev)
iwl_free_isr_ict(priv);
if (priv->beacon_skb)
dev_kfree_skb(priv->beacon_skb);
dev_kfree_skb(priv->beacon_skb);
ieee80211_free_hw(priv->hw);
}