From: Mordechay Goodstein mordechay.goodstein@intel.com
commit 5283dd677e52af9db6fe6ad11b2f12220d519d0c upstream.
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 Signed-off-by: Kalle Valo kvalo@codeaurora.org Link: https://lore.kernel.org/r/iwlwifi.20211110150132.57514296ecab.I52a0411774b70... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/wireless/intel/iwlwifi/iwl-drv.c | 22 +++++++++++++------- drivers/net/wireless/intel/iwlwifi/iwl-drv.h | 3 ++ drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c | 24 +++++++++++++++++++++- drivers/net/wireless/intel/iwlwifi/mvm/mvm.h | 3 ++ drivers/net/wireless/intel/iwlwifi/mvm/ops.c | 3 ++ 5 files changed, 47 insertions(+), 8 deletions(-)
--- a/drivers/net/wireless/intel/iwlwifi/iwl-drv.c +++ b/drivers/net/wireless/intel/iwlwifi/iwl-drv.c @@ -1303,23 +1303,31 @@ _iwl_op_mode_start(struct iwl_drv *drv, 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) --- a/drivers/net/wireless/intel/iwlwifi/iwl-drv.h +++ b/drivers/net/wireless/intel/iwlwifi/iwl-drv.h @@ -144,4 +144,7 @@ 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__ */ --- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c @@ -71,6 +71,7 @@ #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" @@ -1163,9 +1164,30 @@ static int iwl_mvm_mac_start(struct ieee { 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; --- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h +++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h @@ -1162,6 +1162,8 @@ 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, @@ -1173,6 +1175,7 @@ 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 */ --- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c @@ -1295,6 +1295,9 @@ void iwl_mvm_nic_restart(struct iwl_mvm */ if (!mvm->fw_restart && fw_error) { iwl_fw_error_collect(&mvm->fwrt); + } 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;