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iwlwifi: mvm: fix debugfs restart if fw_restart is disabled 

If fw_restart is disabled, using the fw_restart debugfs
file will enable fw_restart and then send the failing
command, but this still frequently fails restart because
it resets fw_restart afterwards and is thus racy.

Fix this by tracking fw_restart separately and allowing
"always restart", "never restart" and "restart N times".

Signed-off-by: Eran Harary <eran.harary@intel.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Eran Harary 2013-07-03 11:00:06 +03:00 committed by Johannes Berg
parent 5dca7c241e
commit 291aa7c4a4
3 changed files with 13 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/net/wireless/iwlwifi/mvm/debugfs.c
View File

@ -597,20 +597,19 @@ static ssize_t iwl_dbgfs_fw_restart_write(struct file *file,
size_t count, loff_t *ppos)
{
struct iwl_mvm *mvm = file->private_data;
bool restart_fw = iwlwifi_mod_params.restart_fw;
int ret;
iwlwifi_mod_params.restart_fw = true;
mutex_lock(&mvm->mutex);
/* allow one more restart that we're provoking here */
if (mvm->restart_fw >= 0)
mvm->restart_fw++;
/* take the return value to make compiler happy - it will fail anyway */
ret = iwl_mvm_send_cmd_pdu(mvm, REPLY_ERROR, CMD_SYNC, 0, NULL);
mutex_unlock(&mvm->mutex);
iwlwifi_mod_params.restart_fw = restart_fw;
return count;
}

3
drivers/net/wireless/iwlwifi/mvm/mvm.h
View File

@ -477,6 +477,9 @@ struct iwl_mvm {
*/
u8 vif_count;
/* -1 for always, 0 for never, >0 for that many times */
s8 restart_fw;
struct led_classdev led;
struct ieee80211_vif *p2p_device_vif;

9
drivers/net/wireless/iwlwifi/mvm/ops.c
View File

@ -342,6 +342,8 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
mvm->fw = fw;
mvm->hw = hw;
mvm->restart_fw = iwlwifi_mod_params.restart_fw ? -1 : 0;
mutex_init(&mvm->mutex);
spin_lock_init(&mvm->async_handlers_lock);
INIT_LIST_HEAD(&mvm->time_event_list);
@ -695,8 +697,7 @@ static void iwl_mvm_nic_restart(struct iwl_mvm *mvm)
reprobe->dev = mvm->trans->dev;
INIT_WORK(&reprobe->work, iwl_mvm_reprobe_wk);
schedule_work(&reprobe->work);
} else if (mvm->cur_ucode == IWL_UCODE_REGULAR &&
iwlwifi_mod_params.restart_fw) {
} else if (mvm->cur_ucode == IWL_UCODE_REGULAR && mvm->restart_fw) {
/*
* This is a bit racy, but worst case we tell mac80211 about
* a stopped/aborted (sched) scan when that was already done
@ -714,6 +715,8 @@ static void iwl_mvm_nic_restart(struct iwl_mvm *mvm)
break;
}
if (mvm->restart_fw > 0)
mvm->restart_fw--;
ieee80211_restart_hw(mvm->hw);
}
}
@ -723,7 +726,7 @@ static void iwl_mvm_nic_error(struct iwl_op_mode *op_mode)
struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
iwl_mvm_dump_nic_error_log(mvm);
if (!iwlwifi_mod_params.restart_fw)
if (!mvm->restart_fw)
iwl_mvm_dump_sram(mvm);
iwl_mvm_nic_restart(mvm);