linux-kernel - [PATCH AUTOSEL 6.1 14/17] wifi: iwlwifi: mvm: pause TCM when the firmware is stopped

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Message-ID: <20240903192600.1108046-14-sashal@kernel.org>
Date: Tue,  3 Sep 2024 15:25:28 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
	Miri Korenblit <miriam.rachel.korenblit@...el.com>,
	Johannes Berg <johannes.berg@...el.com>,
	Sasha Levin <sashal@...nel.org>,
	kvalo@...nel.org,
	gregory.greenman@...el.com,
	shaul.triebitz@...el.com,
	benjamin.berg@...el.com,
	ilan.peer@...el.com,
	pagadala.yesu.anjaneyulu@...el.com,
	shahar.s.matityahu@...el.com,
	linux-wireless@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 14/17] wifi: iwlwifi: mvm: pause TCM when the firmware is stopped

From: Emmanuel Grumbach <emmanuel.grumbach@...el.com>

[ Upstream commit 0668ebc8c2282ca1e7eb96092a347baefffb5fe7 ]

Not doing so will make us send a host command to the transport while the
firmware is not alive, which will trigger a WARNING.

bad state = 0
WARNING: CPU: 2 PID: 17434 at drivers/net/wireless/intel/iwlwifi/iwl-trans.c:115 iwl_trans_send_cmd+0x1cb/0x1e0 [iwlwifi]
RIP: 0010:iwl_trans_send_cmd+0x1cb/0x1e0 [iwlwifi]
Call Trace:
 <TASK>
 iwl_mvm_send_cmd+0x40/0xc0 [iwlmvm]
 iwl_mvm_config_scan+0x198/0x260 [iwlmvm]
 iwl_mvm_recalc_tcm+0x730/0x11d0 [iwlmvm]
 iwl_mvm_tcm_work+0x1d/0x30 [iwlmvm]
 process_one_work+0x29e/0x640
 worker_thread+0x2df/0x690
 ? rescuer_thread+0x540/0x540
 kthread+0x192/0x1e0
 ? set_kthread_struct+0x90/0x90
 ret_from_fork+0x22/0x30

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@...el.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@...el.com>
Link: https://patch.msgid.link/20240825191257.5abe71ca1b6b.I97a968cb8be1f24f94652d9b110ecbf6af73f89e@changeid
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/intel/iwlwifi/mvm/ops.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
index 864f5fb260409..e5fa499effb1e 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
@@ -1372,6 +1372,8 @@ void iwl_mvm_stop_device(struct iwl_mvm *mvm)
 
 	clear_bit(IWL_MVM_STATUS_FIRMWARE_RUNNING, &mvm->status);
 
+	iwl_mvm_pause_tcm(mvm, false);
+
 	iwl_fw_dbg_stop_sync(&mvm->fwrt);
 	iwl_trans_stop_device(mvm->trans);
 	iwl_free_fw_paging(&mvm->fwrt);
-- 
2.43.0