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iwlwifi: cleanup iwl_good_plcp_health 

Make iwl_good_plcp_health code easiest to read.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Stanislaw Gruszka 2011-03-04 17:51:50 +01:00 committed by John W. Linville
parent 466a19a003
commit 6198c387b2
1 changed files with 43 additions and 68 deletions
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111
drivers/net/wireless/iwlwifi/iwl-rx.c
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@ -451,82 +451,57 @@ static bool iwl_good_ack_health(struct iwl_priv *priv, struct iwl_rx_packet *pkt
static bool iwl_good_plcp_health(struct iwl_priv *priv,
struct iwl_rx_packet *pkt)
{
bool rc = true;
int combined_plcp_delta;
unsigned int plcp_msec;
unsigned long plcp_received_jiffies;
unsigned int msecs;
unsigned long stamp;
int delta;
int threshold = priv->cfg->base_params->plcp_delta_threshold;
if (priv->cfg->base_params->plcp_delta_threshold ==
IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
if (threshold == IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
return rc;
return true;
}
/*
* check for plcp_err and trigger radio reset if it exceeds
* the plcp error threshold plcp_delta.
*/
plcp_received_jiffies = jiffies;
plcp_msec = jiffies_to_msecs((long) plcp_received_jiffies -
(long) priv->plcp_jiffies);
priv->plcp_jiffies = plcp_received_jiffies;
/*
* check to make sure plcp_msec is not 0 to prevent division
* by zero.
*/
if (plcp_msec) {
struct statistics_rx_phy *ofdm;
struct statistics_rx_ht_phy *ofdm_ht;
stamp = jiffies;
msecs = jiffies_to_msecs(stamp - priv->plcp_jiffies);
priv->plcp_jiffies = stamp;
if (iwl_bt_statistics(priv)) {
ofdm = &pkt->u.stats_bt.rx.ofdm;
ofdm_ht = &pkt->u.stats_bt.rx.ofdm_ht;
combined_plcp_delta =
(le32_to_cpu(ofdm->plcp_err) -
le32_to_cpu(priv->_agn.statistics_bt.
rx.ofdm.plcp_err)) +
(le32_to_cpu(ofdm_ht->plcp_err) -
le32_to_cpu(priv->_agn.statistics_bt.
rx.ofdm_ht.plcp_err));
} else {
ofdm = &pkt->u.stats.rx.ofdm;
ofdm_ht = &pkt->u.stats.rx.ofdm_ht;
combined_plcp_delta =
(le32_to_cpu(ofdm->plcp_err) -
le32_to_cpu(priv->_agn.statistics.
rx.ofdm.plcp_err)) +
(le32_to_cpu(ofdm_ht->plcp_err) -
le32_to_cpu(priv->_agn.statistics.
rx.ofdm_ht.plcp_err));
}
if (msecs == 0)
return true;
if ((combined_plcp_delta > 0) &&
((combined_plcp_delta * 100) / plcp_msec) >
priv->cfg->base_params->plcp_delta_threshold) {
/*
* if plcp_err exceed the threshold,
* the following data is printed in csv format:
* Text: plcp_err exceeded %d,
* Received ofdm.plcp_err,
* Current ofdm.plcp_err,
* Received ofdm_ht.plcp_err,
* Current ofdm_ht.plcp_err,
* combined_plcp_delta,
* plcp_msec
*/
IWL_DEBUG_RADIO(priv, "plcp_err exceeded %u, "
"%u, %u, %u, %u, %d, %u mSecs\n",
priv->cfg->base_params->plcp_delta_threshold,
le32_to_cpu(ofdm->plcp_err),
le32_to_cpu(ofdm->plcp_err),
le32_to_cpu(ofdm_ht->plcp_err),
le32_to_cpu(ofdm_ht->plcp_err),
combined_plcp_delta, plcp_msec);
if (iwl_bt_statistics(priv)) {
struct statistics_rx_bt *cur, *old;
rc = false;
}
cur = &pkt->u.stats_bt.rx;
old = &priv->_agn.statistics_bt.rx;
delta = le32_to_cpu(cur->ofdm.plcp_err) -
le32_to_cpu(old->ofdm.plcp_err) +
le32_to_cpu(cur->ofdm_ht.plcp_err) -
le32_to_cpu(old->ofdm_ht.plcp_err);
} else {
struct statistics_rx *cur, *old;
cur = &pkt->u.stats.rx;
old = &priv->_agn.statistics.rx;
delta = le32_to_cpu(cur->ofdm.plcp_err) -
le32_to_cpu(old->ofdm.plcp_err) +
le32_to_cpu(cur->ofdm_ht.plcp_err) -
le32_to_cpu(old->ofdm_ht.plcp_err);
}
return rc;
/* Can be negative if firmware reseted statistics */
if (delta <= 0)
return true;
if ((delta * 100 / msecs) > threshold) {
IWL_DEBUG_RADIO(priv,
"plcp health threshold %u delta %d msecs %u\n",
threshold, delta, msecs);
return false;
}
return true;
}
static void iwl_recover_from_statistics(struct iwl_priv *priv,