From d73d2c6e3313f0ba60711ab4f4b9044eddca9ca5 Mon Sep 17 00:00:00 2001
From: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Date: Sun, 9 Feb 2025 14:34:49 +0200
Subject: [PATCH] wifi: iwlwifi: mvm: don't try to talk to a dead firmware
This fixes:
bad state = 0
WARNING: CPU: 10 PID: 702 at drivers/net/wireless/inel/iwlwifi/iwl-trans.c:178 iwl_trans_send_cmd+0xba/0xe0 [iwlwifi]
Call Trace:
<TASK>
? __warn+0xca/0x1c0
? iwl_trans_send_cmd+0xba/0xe0 [iwlwifi 64fa9ad799a0e0d2ba53d4af93a53ad9a531f8d4]
iwl_fw_dbg_clear_monitor_buf+0xd7/0x110 [iwlwifi 64fa9ad799a0e0d2ba53d4af93a53ad9a531f8d4]
_iwl_dbgfs_fw_dbg_clear_write+0xe2/0x120 [iwlmvm 0e8adb18cea92d2c341766bcc10b18699290068a]
Ask whether the firmware is alive before sending a command.
Fixes: 268712dc3b34 ("wifi: iwlwifi: mvm: add a debugfs hook to clear the monitor data")
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20250209143303.8e1597b62c70.I12ea71dd9b805b095c9fc12a10c9f34a4e801b61@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
index 83e3c11603622..55d035b896e91 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
@@ -1479,6 +1479,13 @@ static ssize_t iwl_dbgfs_fw_dbg_clear_write(struct iwl_mvm *mvm,
if (mvm->trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_9000)
return -EOPNOTSUPP;
+ /*
+ * If the firmware is not running, silently succeed since there is
+ * no data to clear.
+ */
+ if (!iwl_mvm_firmware_running(mvm))
+ return count;
+
mutex_lock(&mvm->mutex);
iwl_fw_dbg_clear_monitor_buf(&mvm->fwrt);
mutex_unlock(&mvm->mutex);
--
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