| Message ID | iwlwifi.20211110150132.57514296ecab.I52a0411774b700bdc7dedb124d8b59bf99456eb2@changeid (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | 5283dd677e52af9db6fe6ad11b2f12220d519d0c |
| Delegated to: | Kalle Valo |
| Headers | show |
| Series | [v2] iwlwifi: mvm: retry init flow if failed | expand |
On Wed, 2021-11-10 at 15:01 +0200, Luca Coelho wrote: > From: Mordechay Goodstein <mordechay.goodstein@intel.com> > > In some very rare cases the init flow may fail. In many cases, this is > recoverable, so we can retry. Implement a loop to retry two more times > after the first attempt failed. > > This can happen in two different situations, namely during probe and > during mac80211 start. For the first case, a simple loop is enough. > For the second case, we need to add a flag to prevent mac80211 from > trying to restart it as well, leaving full control with the driver. > > Cc: <stable@vger.kernel.org> > Signed-off-by: Mordechay Goodstein <mordechay.goodstein@intel.com> > Signed-off-by: Luca Coelho <luciano.coelho@intel.com> > --- > In v2: fixed a missing brace. Kalle, sorry, I had a rebase damage in the previous version. Fixed in v2. I marked v1 as superseded and assigned v2 to you. -- Cheers, Luca.
Luca Coelho <luca@coelho.fi> wrote: > From: Mordechay Goodstein <mordechay.goodstein@intel.com> > > In some very rare cases the init flow may fail. In many cases, this is > recoverable, so we can retry. Implement a loop to retry two more times > after the first attempt failed. > > This can happen in two different situations, namely during probe and > during mac80211 start. For the first case, a simple loop is enough. > For the second case, we need to add a flag to prevent mac80211 from > trying to restart it as well, leaving full control with the driver. > > Cc: <stable@vger.kernel.org> > Signed-off-by: Mordechay Goodstein <mordechay.goodstein@intel.com> > Signed-off-by: Luca Coelho <luciano.coelho@intel.com> Patch applied to wireless-drivers.git, thanks. 5283dd677e52 iwlwifi: mvm: retry init flow if failed
diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-drv.c b/drivers/net/wireless/intel/iwlwifi/iwl-drv.c index 36196e07b1a0..5cec467b995b 100644 --- a/drivers/net/wireless/intel/iwlwifi/iwl-drv.c +++ b/drivers/net/wireless/intel/iwlwifi/iwl-drv.c @@ -1313,23 +1313,31 @@ _iwl_op_mode_start(struct iwl_drv *drv, struct iwlwifi_opmode_table *op) const struct iwl_op_mode_ops *ops = op->ops; struct dentry *dbgfs_dir = NULL; struct iwl_op_mode *op_mode = NULL; + int retry, max_retry = !!iwlwifi_mod_params.fw_restart * IWL_MAX_INIT_RETRY; + + for (retry = 0; retry <= max_retry; retry++) { #ifdef CONFIG_IWLWIFI_DEBUGFS - drv->dbgfs_op_mode = debugfs_create_dir(op->name, - drv->dbgfs_drv); - dbgfs_dir = drv->dbgfs_op_mode; + drv->dbgfs_op_mode = debugfs_create_dir(op->name, + drv->dbgfs_drv); + dbgfs_dir = drv->dbgfs_op_mode; #endif - op_mode = ops->start(drv->trans, drv->trans->cfg, &drv->fw, dbgfs_dir); + op_mode = ops->start(drv->trans, drv->trans->cfg, + &drv->fw, dbgfs_dir); + + if (op_mode) + return op_mode; + + IWL_ERR(drv, "retry init count %d\n", retry); #ifdef CONFIG_IWLWIFI_DEBUGFS - if (!op_mode) { debugfs_remove_recursive(drv->dbgfs_op_mode); drv->dbgfs_op_mode = NULL; - } #endif + } - return op_mode; + return NULL; } static void _iwl_op_mode_stop(struct iwl_drv *drv) diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-drv.h b/drivers/net/wireless/intel/iwlwifi/iwl-drv.h index 2e2d60a58692..0fd009e6d685 100644 --- a/drivers/net/wireless/intel/iwlwifi/iwl-drv.h +++ b/drivers/net/wireless/intel/iwlwifi/iwl-drv.h @@ -89,4 +89,7 @@ void iwl_drv_stop(struct iwl_drv *drv); #define IWL_EXPORT_SYMBOL(sym) #endif +/* max retry for init flow */ +#define IWL_MAX_INIT_RETRY 2 + #endif /* __iwl_drv_h__ */ diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c index 9fb9c7dad314..897e3b91ddb2 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c @@ -16,6 +16,7 @@ #include <net/ieee80211_radiotap.h> #include <net/tcp.h> +#include "iwl-drv.h" #include "iwl-op-mode.h" #include "iwl-io.h" #include "mvm.h" @@ -1117,9 +1118,30 @@ static int iwl_mvm_mac_start(struct ieee80211_hw *hw) { struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw); int ret; + int retry, max_retry = 0; mutex_lock(&mvm->mutex); - ret = __iwl_mvm_mac_start(mvm); + + /* we are starting the mac not in error flow, and restart is enabled */ + if (!test_bit(IWL_MVM_STATUS_HW_RESTART_REQUESTED, &mvm->status) && + iwlwifi_mod_params.fw_restart) { + max_retry = IWL_MAX_INIT_RETRY; + /* + * This will prevent mac80211 recovery flows to trigger during + * init failures + */ + set_bit(IWL_MVM_STATUS_STARTING, &mvm->status); + } + + for (retry = 0; retry <= max_retry; retry++) { + ret = __iwl_mvm_mac_start(mvm); + if (!ret) + break; + + IWL_ERR(mvm, "mac start retry %d\n", retry); + } + clear_bit(IWL_MVM_STATUS_STARTING, &mvm->status); + mutex_unlock(&mvm->mutex); return ret; diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h index 2b1dcd60e00f..a72d85086fe3 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h +++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h @@ -1123,6 +1123,8 @@ struct iwl_mvm { * @IWL_MVM_STATUS_FIRMWARE_RUNNING: firmware is running * @IWL_MVM_STATUS_NEED_FLUSH_P2P: need to flush P2P bcast STA * @IWL_MVM_STATUS_IN_D3: in D3 (or at least about to go into it) + * @IWL_MVM_STATUS_STARTING: starting mac, + * used to disable restart flow while in STARTING state */ enum iwl_mvm_status { IWL_MVM_STATUS_HW_RFKILL, @@ -1134,6 +1136,7 @@ enum iwl_mvm_status { IWL_MVM_STATUS_FIRMWARE_RUNNING, IWL_MVM_STATUS_NEED_FLUSH_P2P, IWL_MVM_STATUS_IN_D3, + IWL_MVM_STATUS_STARTING, }; /* Keep track of completed init configuration */ diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c index 232ad531d612..ce7160670aa7 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c @@ -1600,6 +1600,9 @@ void iwl_mvm_nic_restart(struct iwl_mvm *mvm, bool fw_error) */ if (!mvm->fw_restart && fw_error) { iwl_fw_error_collect(&mvm->fwrt, false); + } else if (test_bit(IWL_MVM_STATUS_STARTING, + &mvm->status)) { + IWL_ERR(mvm, "Starting mac, retry will be triggered anyway\n"); } else if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) { struct iwl_mvm_reprobe *reprobe;