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iwlwifi: fix DMA channel number in iwl_txq_ctx_stop 

The patch fixes the misuse of DMA channel number by Tx queue number in
iwl_tx_ctx_stop().

The problem was originally reported by Wu Fengguang who complains
iwlagn driver takes too long time when issuing `ifconfig wlan0 down`.
The patch now decreases the interface bring down time from 2 seconds
to 0.8 second.

This fixes bugs:
http://bugzilla.kernel.org/show_bug.cgi?id=11956
http://www.intellinuxwireless.org/bugzilla/show_bug.cgi?id=1790

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Tested-by: Fengguang Wu <fengguang.wu@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Zhu Yi 2008-12-02 12:14:04 -08:00 committed by John W. Linville
parent 74221d0740
commit f3f911d177
4 changed files with 10 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/wireless/iwlwifi/iwl-4965.c
View File

@ -816,6 +816,7 @@ static int iwl4965_hw_set_hw_params(struct iwl_priv *priv)
}
priv->hw_params.max_txq_num = priv->cfg->mod_params->num_of_queues;
priv->hw_params.dma_chnl_num = FH49_TCSR_CHNL_NUM;
priv->hw_params.scd_bc_tbls_size =
IWL49_NUM_QUEUES * sizeof(struct iwl4965_scd_bc_tbl);
priv->hw_params.max_stations = IWL4965_STATION_COUNT;

1
drivers/net/wireless/iwlwifi/iwl-5000.c
View File

@ -827,6 +827,7 @@ static int iwl5000_hw_set_hw_params(struct iwl_priv *priv)
}
priv->hw_params.max_txq_num = priv->cfg->mod_params->num_of_queues;
priv->hw_params.dma_chnl_num = FH50_TCSR_CHNL_NUM;
priv->hw_params.scd_bc_tbls_size =
IWL50_NUM_QUEUES * sizeof(struct iwl5000_scd_bc_tbl);
priv->hw_params.max_stations = IWL5000_STATION_COUNT;

4
drivers/net/wireless/iwlwifi/iwl-dev.h
View File

@ -508,6 +508,7 @@ struct iwl_sensitivity_ranges {
/**
* struct iwl_hw_params
* @max_txq_num: Max # Tx queues supported
* @dma_chnl_num: Number of Tx DMA/FIFO channels
* @scd_bc_tbls_size: size of scheduler byte count tables
* @tx/rx_chains_num: Number of TX/RX chains
* @valid_tx/rx_ant: usable antennas
@ -525,7 +526,8 @@ struct iwl_sensitivity_ranges {
* @struct iwl_sensitivity_ranges: range of sensitivity values
*/
struct iwl_hw_params {
u16 max_txq_num;
u8 max_txq_num;
u8 dma_chnl_num;
u16 scd_bc_tbls_size;
u8 tx_chains_num;
u8 rx_chains_num;

11
drivers/net/wireless/iwlwifi/iwl-tx.c
View File

@ -611,7 +611,7 @@ int iwl_txq_ctx_reset(struct iwl_priv *priv)
*/
void iwl_txq_ctx_stop(struct iwl_priv *priv)
{
int txq_id;
int ch;
unsigned long flags;
/* Turn off all Tx DMA fifos */
@ -624,12 +624,11 @@ void iwl_txq_ctx_stop(struct iwl_priv *priv)
priv->cfg->ops->lib->txq_set_sched(priv, 0);
/* Stop each Tx DMA channel, and wait for it to be idle */
for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++) {
iwl_write_direct32(priv,
FH_TCSR_CHNL_TX_CONFIG_REG(txq_id), 0x0);
for (ch = 0; ch < priv->hw_params.dma_chnl_num; ch++) {
iwl_write_direct32(priv, FH_TCSR_CHNL_TX_CONFIG_REG(ch), 0x0);
iwl_poll_direct_bit(priv, FH_TSSR_TX_STATUS_REG,
FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE
(txq_id), 200);
FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE(ch),
200);
}
iwl_release_nic_access(priv);
spin_unlock_irqrestore(&priv->lock, flags);