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iwlagn: stop the device before freeing it

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When we remove the module, we free all the tx and rx resources.
Before doing that, we'd better stop the tx / rx activity. Calling
iwl_trans_stop_device in iwl_remove helps also to remove a few API
functions:
 * rx_free:		happens in iwl_trans_free
 * tx_free:		happens in iwl_trans_free
 * disable_sync_irq:	happens in iwl_trans_stop_device

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Emmanuel Grumbach 2011-08-25 23:11:20 -07:00 committed by John W. Linville
parent fd656935cd
commit ae2c30bfcd
3 changed files with 22 additions and 54 deletions
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11
drivers/net/wireless/iwlwifi/iwl-agn.c
View File

@ -3443,20 +3443,13 @@ void __devexit iwl_remove(struct iwl_priv * priv)
priv->mac80211_registered = 0; priv->mac80211_registered = 0;
} }
/* Reset to low power before unloading driver. */
iwl_apm_stop(priv);
iwl_tt_exit(priv); iwl_tt_exit(priv);
/* make sure we flush any pending irq or /*This will stop the queues, move the device to low power state */
* tasklet for the driver */ iwl_trans_stop_device(trans(priv));
iwl_trans_disable_sync_irq(trans(priv));
iwl_dealloc_ucode(priv); iwl_dealloc_ucode(priv);
iwl_trans_rx_free(trans(priv));
iwl_trans_tx_free(trans(priv));
iwl_eeprom_free(priv); iwl_eeprom_free(priv);
/*netif_stop_queue(dev); */ /*netif_stop_queue(dev); */

42
drivers/net/wireless/iwlwifi/iwl-trans.c
View File

@ -555,7 +555,7 @@ static int iwl_trans_tx_alloc(struct iwl_trans *trans)
return 0; return 0;
error: error:
iwl_trans_tx_free(trans); iwl_trans_pcie_tx_free(trans);
return ret; return ret;
} }
@ -603,7 +603,7 @@ static int iwl_tx_init(struct iwl_trans *trans)
error: error:
/*Upon error, free only if we allocated something */ /*Upon error, free only if we allocated something */
if (alloc) if (alloc)
iwl_trans_tx_free(trans); iwl_trans_pcie_tx_free(trans);
return ret; return ret;
} }
@ -958,13 +958,28 @@ static int iwl_trans_tx_stop(struct iwl_trans *trans)
return 0; return 0;
} }
static void iwl_trans_pcie_disable_sync_irq(struct iwl_trans *trans)
{
unsigned long flags;
struct iwl_trans_pcie *trans_pcie =
IWL_TRANS_GET_PCIE_TRANS(trans);
spin_lock_irqsave(&trans->shrd->lock, flags);
iwl_disable_interrupts(trans);
spin_unlock_irqrestore(&trans->shrd->lock, flags);
/* wait to make sure we flush pending tasklet*/
synchronize_irq(bus(trans)->irq);
tasklet_kill(&trans_pcie->irq_tasklet);
}
static void iwl_trans_pcie_stop_device(struct iwl_trans *trans) static void iwl_trans_pcie_stop_device(struct iwl_trans *trans)
{ {
/* stop and reset the on-board processor */ /* stop and reset the on-board processor */
iwl_write32(bus(trans), CSR_RESET, CSR_RESET_REG_FLAG_NEVO_RESET); iwl_write32(bus(trans), CSR_RESET, CSR_RESET_REG_FLAG_NEVO_RESET);
/* tell the device to stop sending interrupts */ /* tell the device to stop sending interrupts */
iwl_trans_disable_sync_irq(trans); iwl_trans_pcie_disable_sync_irq(trans);
/* device going down, Stop using ICT table */ /* device going down, Stop using ICT table */
iwl_disable_ict(trans); iwl_disable_ict(trans);
@ -1208,23 +1223,10 @@ static void iwl_trans_pcie_reclaim(struct iwl_trans *trans, int txq_id,
} }
} }
static void iwl_trans_pcie_disable_sync_irq(struct iwl_trans *trans)
{
unsigned long flags;
struct iwl_trans_pcie *trans_pcie =
IWL_TRANS_GET_PCIE_TRANS(trans);
spin_lock_irqsave(&trans->shrd->lock, flags);
iwl_disable_interrupts(trans);
spin_unlock_irqrestore(&trans->shrd->lock, flags);
/* wait to make sure we flush pending tasklet*/
synchronize_irq(bus(trans)->irq);
tasklet_kill(&trans_pcie->irq_tasklet);
}
static void iwl_trans_pcie_free(struct iwl_trans *trans) static void iwl_trans_pcie_free(struct iwl_trans *trans)
{ {
iwl_trans_pcie_tx_free(trans);
iwl_trans_pcie_rx_free(trans);
free_irq(bus(trans)->irq, trans); free_irq(bus(trans)->irq, trans);
iwl_free_isr_ict(trans); iwl_free_isr_ict(trans);
trans->shrd->trans = NULL; trans->shrd->trans = NULL;
@ -1860,9 +1862,6 @@ const struct iwl_trans_ops trans_ops_pcie = {
.tx_start = iwl_trans_pcie_tx_start, .tx_start = iwl_trans_pcie_tx_start,
.rx_free = iwl_trans_pcie_rx_free,
.tx_free = iwl_trans_pcie_tx_free,
.send_cmd = iwl_trans_pcie_send_cmd, .send_cmd = iwl_trans_pcie_send_cmd,
.send_cmd_pdu = iwl_trans_pcie_send_cmd_pdu, .send_cmd_pdu = iwl_trans_pcie_send_cmd_pdu,
@ -1875,7 +1874,6 @@ const struct iwl_trans_ops trans_ops_pcie = {
.kick_nic = iwl_trans_pcie_kick_nic, .kick_nic = iwl_trans_pcie_kick_nic,
.disable_sync_irq = iwl_trans_pcie_disable_sync_irq,
.free = iwl_trans_pcie_free, .free = iwl_trans_pcie_free,
.dbgfs_register = iwl_trans_pcie_dbgfs_register, .dbgfs_register = iwl_trans_pcie_dbgfs_register,

23
drivers/net/wireless/iwlwifi/iwl-trans.h
View File

@ -88,8 +88,6 @@ struct iwl_shared;
* @tx_start: starts and configures all the Tx fifo - usually done once the fw * @tx_start: starts and configures all the Tx fifo - usually done once the fw
* is alive. * is alive.
* @stop_device:stops the whole device (embedded CPU put to reset) * @stop_device:stops the whole device (embedded CPU put to reset)
* @rx_free: frees the rx memory
* @tx_free: frees the tx memory
* @send_cmd:send a host command * @send_cmd:send a host command
* @send_cmd_pdu:send a host command: flags can be CMD_* * @send_cmd_pdu:send a host command: flags can be CMD_*
* @get_tx_cmd: returns a pointer to a new Tx cmd for the upper layer use * @get_tx_cmd: returns a pointer to a new Tx cmd for the upper layer use
@ -99,9 +97,6 @@ struct iwl_shared;
* ready and a successful ADDBA response has been received. * ready and a successful ADDBA response has been received.
* @txq_agg_disable: de-configure a Tx queue to send AMPDUs * @txq_agg_disable: de-configure a Tx queue to send AMPDUs
* @kick_nic: remove the RESET from the embedded CPU and let it run * @kick_nic: remove the RESET from the embedded CPU and let it run
* @disable_sync_irq: Disable and sync: after this handler returns, it is
* guaranteed that all the ISR / tasklet etc... have finished running
* and the transport layer shall not pass any Rx.
* @free: release all the ressource for the transport layer itself such as * @free: release all the ressource for the transport layer itself such as
* irq, tasklet etc... * irq, tasklet etc...
* @dbgfs_register: add the dbgfs files under this directory. Files will be * @dbgfs_register: add the dbgfs files under this directory. Files will be
@ -117,8 +112,6 @@ struct iwl_trans_ops {
int (*prepare_card_hw)(struct iwl_trans *trans); int (*prepare_card_hw)(struct iwl_trans *trans);
void (*stop_device)(struct iwl_trans *trans); void (*stop_device)(struct iwl_trans *trans);
void (*tx_start)(struct iwl_trans *trans); void (*tx_start)(struct iwl_trans *trans);
void (*tx_free)(struct iwl_trans *trans);
void (*rx_free)(struct iwl_trans *trans);
int (*send_cmd)(struct iwl_trans *trans, struct iwl_host_cmd *cmd); int (*send_cmd)(struct iwl_trans *trans, struct iwl_host_cmd *cmd);
@ -138,7 +131,6 @@ struct iwl_trans_ops {
void (*kick_nic)(struct iwl_trans *trans); void (*kick_nic)(struct iwl_trans *trans);
void (*disable_sync_irq)(struct iwl_trans *trans);
void (*free)(struct iwl_trans *trans); void (*free)(struct iwl_trans *trans);
int (*dbgfs_register)(struct iwl_trans *trans, struct dentry* dir); int (*dbgfs_register)(struct iwl_trans *trans, struct dentry* dir);
@ -187,16 +179,6 @@ static inline void iwl_trans_tx_start(struct iwl_trans *trans)
trans->ops->tx_start(trans); trans->ops->tx_start(trans);
} }
static inline void iwl_trans_rx_free(struct iwl_trans *trans)
{
trans->ops->rx_free(trans);
}
static inline void iwl_trans_tx_free(struct iwl_trans *trans)
{
trans->ops->tx_free(trans);
}
static inline int iwl_trans_send_cmd(struct iwl_trans *trans, static inline int iwl_trans_send_cmd(struct iwl_trans *trans,
struct iwl_host_cmd *cmd) struct iwl_host_cmd *cmd)
{ {
@ -247,11 +229,6 @@ static inline void iwl_trans_kick_nic(struct iwl_trans *trans)
trans->ops->kick_nic(trans); trans->ops->kick_nic(trans);
} }
static inline void iwl_trans_disable_sync_irq(struct iwl_trans *trans)
{
trans->ops->disable_sync_irq(trans);
}
static inline void iwl_trans_free(struct iwl_trans *trans) static inline void iwl_trans_free(struct iwl_trans *trans)
{ {
trans->ops->free(trans); trans->ops->free(trans);