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iwlwifi: the transport knows its state

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This allows to handle races such as Tx packets on their way to be
sent although the transport has been stopped already.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
This commit is contained in:
Emmanuel Grumbach 2012-02-06 14:30:54 +02:00 committed by Wey-Yi Guy
parent 8655112d91
commit 69655ebf1a
1 changed files with 49 additions and 0 deletions
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49
drivers/net/wireless/iwlwifi/iwl-trans.h
View file

@ -69,6 +69,7 @@
#include "iwl-shared.h"
#include "iwl-commands.h"
#include "iwl-ucode.h"
#include "iwl-debug.h"
/**
* DOC: Transport layer - what is it ?
@ -296,6 +297,17 @@ struct iwl_calib_result {
/* data follows */
};
/**
* enum iwl_trans_state - state of the transport layer
*
* @IWL_TRANS_NO_FW: no fw has sent an alive response
* @IWL_TRANS_FW_ALIVE: a fw has sent an alive response
*/
enum iwl_trans_state {
IWL_TRANS_NO_FW = 0,
IWL_TRANS_FW_ALIVE = 1,
};
/**
* struct iwl_trans - transport common data
*
@ -319,6 +331,7 @@ struct iwl_calib_result {
struct iwl_trans {
const struct iwl_trans_ops *ops;
struct iwl_shared *shrd;
enum iwl_trans_state state;
spinlock_t hcmd_lock;
spinlock_t reg_lock;
@ -352,6 +365,8 @@ static inline void iwl_trans_stop_hw(struct iwl_trans *trans)
might_sleep();
trans->ops->stop_hw(trans);
trans->state = IWL_TRANS_NO_FW;
}
static inline void iwl_trans_fw_alive(struct iwl_trans *trans)
@ -359,6 +374,8 @@ static inline void iwl_trans_fw_alive(struct iwl_trans *trans)
might_sleep();
trans->ops->fw_alive(trans);
trans->state = IWL_TRANS_FW_ALIVE;
}
static inline int iwl_trans_start_fw(struct iwl_trans *trans, struct fw_img *fw)
@ -373,12 +390,17 @@ static inline void iwl_trans_stop_device(struct iwl_trans *trans)
might_sleep();
trans->ops->stop_device(trans);
trans->state = IWL_TRANS_NO_FW;
}
static inline void iwl_trans_wake_any_queue(struct iwl_trans *trans,
enum iwl_rxon_context_id ctx,
const char *msg)
{
if (trans->state != IWL_TRANS_FW_ALIVE)
IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
trans->ops->wake_any_queue(trans, ctx, msg);
}
@ -386,6 +408,9 @@ static inline void iwl_trans_wake_any_queue(struct iwl_trans *trans,
static inline int iwl_trans_send_cmd(struct iwl_trans *trans,
struct iwl_host_cmd *cmd)
{
if (trans->state != IWL_TRANS_FW_ALIVE)
IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
return trans->ops->send_cmd(trans, cmd);
}
@ -396,6 +421,9 @@ static inline int iwl_trans_tx(struct iwl_trans *trans, struct sk_buff *skb,
struct iwl_device_cmd *dev_cmd, enum iwl_rxon_context_id ctx,
u8 sta_id, u8 tid)
{
if (trans->state != IWL_TRANS_FW_ALIVE)
IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
return trans->ops->tx(trans, skb, dev_cmd, ctx, sta_id, tid);
}
@ -403,6 +431,9 @@ static inline int iwl_trans_reclaim(struct iwl_trans *trans, int sta_id,
int tid, int txq_id, int ssn, u32 status,
struct sk_buff_head *skbs)
{
if (trans->state != IWL_TRANS_FW_ALIVE)
IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
return trans->ops->reclaim(trans, sta_id, tid, txq_id, ssn,
status, skbs);
}
@ -412,6 +443,9 @@ static inline int iwl_trans_tx_agg_disable(struct iwl_trans *trans,
{
might_sleep();
if (trans->state != IWL_TRANS_FW_ALIVE)
IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
return trans->ops->tx_agg_disable(trans, sta_id, tid);
}
@ -420,6 +454,9 @@ static inline int iwl_trans_tx_agg_alloc(struct iwl_trans *trans,
{
might_sleep();
if (trans->state != IWL_TRANS_FW_ALIVE)
IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
return trans->ops->tx_agg_alloc(trans, sta_id, tid);
}
@ -431,6 +468,9 @@ static inline void iwl_trans_tx_agg_setup(struct iwl_trans *trans,
{
might_sleep();
if (trans->state != IWL_TRANS_FW_ALIVE)
IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
trans->ops->tx_agg_setup(trans, ctx, sta_id, tid, frame_limit, ssn);
}
@ -442,16 +482,25 @@ static inline void iwl_trans_free(struct iwl_trans *trans)
static inline void iwl_trans_stop_queue(struct iwl_trans *trans, int q,
const char *msg)
{
if (trans->state != IWL_TRANS_FW_ALIVE)
IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
trans->ops->stop_queue(trans, q, msg);
}
static inline int iwl_trans_wait_tx_queue_empty(struct iwl_trans *trans)
{
if (trans->state != IWL_TRANS_FW_ALIVE)
IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
return trans->ops->wait_tx_queue_empty(trans);
}
static inline int iwl_trans_check_stuck_queue(struct iwl_trans *trans, int q)
{
if (trans->state != IWL_TRANS_FW_ALIVE)
IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
return trans->ops->check_stuck_queue(trans, q);
}
static inline int iwl_trans_dbgfs_register(struct iwl_trans *trans,