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iwlwifi: remove unneeded locks from apm_stop() and stop_master()

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Since priv->reg_lock was added to keep multi-access register manipulation
atomic, priv->lock protection is no longer needed.  Remove this from
iwl_apm_stop_master() and iwl_apm_stop().

Add warning of timeout when polling for busmaster disablement confirmation,
and some comments.

NOTE:  This is needed to enable use of apm_ops.stop() within iwl_eeprom_init();
priv->lock does not get initialized until after this flow.  See patch
"remove power-wasting calls to apm_ops.init()"

Signed-off-by: Ben Cahill <ben.m.cahill@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:
Ben Cahill 2009-10-30 14:36:05 -07:00 committed by John W. Linville
parent 5ebeb5a676
commit 5220af0c3b
1 changed files with 13 additions and 13 deletions
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26
drivers/net/wireless/iwlwifi/iwl-core.c
View file

@ -1353,39 +1353,39 @@ EXPORT_SYMBOL(iwl_irq_handle_error);
int iwl_apm_stop_master(struct iwl_priv *priv)
{
unsigned long flags;
int ret = 0;
spin_lock_irqsave(&priv->lock, flags);
/* set stop master bit */
/* stop device's busmaster DMA activity */
iwl_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_STOP_MASTER);
iwl_poll_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_MASTER_DISABLED,
ret = iwl_poll_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_MASTER_DISABLED,
CSR_RESET_REG_FLAG_MASTER_DISABLED, 100);
if (ret)
IWL_WARN(priv, "Master Disable Timed Out, 100 usec\n");
spin_unlock_irqrestore(&priv->lock, flags);
IWL_DEBUG_INFO(priv, "stop master\n");
return 0;
return ret;
}
EXPORT_SYMBOL(iwl_apm_stop_master);
void iwl_apm_stop(struct iwl_priv *priv)
{
unsigned long flags;
IWL_DEBUG_INFO(priv, "Stop card, put in low power state\n");
/* Stop device's DMA activity */
iwl_apm_stop_master(priv);
spin_lock_irqsave(&priv->lock, flags);
/* Reset the entire device */
iwl_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
udelay(10);
/* clear "init complete" move adapter D0A* --> D0U state */
/*
* Clear "initialization complete" bit to move adapter from
* D0A* (powered-up Active) --> D0U* (Uninitialized) state.
*/
iwl_clear_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
spin_unlock_irqrestore(&priv->lock, flags);
}
EXPORT_SYMBOL(iwl_apm_stop);