linux-kernel - [PATCH AUTOSEL 5.15 04/10] wifi: iwlwifi: mvm: Use the sync timepoint API in suspend

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Message-ID: <20241104105414.97666-4-sashal@kernel.org>
Date: Mon,  4 Nov 2024 05:53:53 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Daniel Gabay <daniel.gabay@...el.com>,
	Miri Korenblit <miriam.rachel.korenblit@...el.com>,
	Johannes Berg <johannes.berg@...el.com>,
	Sasha Levin <sashal@...nel.org>,
	kvalo@...nel.org,
	shaul.triebitz@...el.com,
	gregory.greenman@...el.com,
	yedidya.ben.shimol@...el.com,
	emmanuel.grumbach@...el.com,
	benjamin.berg@...el.com,
	linux-wireless@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 04/10] wifi: iwlwifi: mvm: Use the sync timepoint API in suspend

From: Daniel Gabay <daniel.gabay@...el.com>

[ Upstream commit 9715246ca0bfc9feaec1b4ff5b3d38de65a7025d ]

When starting the suspend flow, HOST_D3_START triggers an _async_
firmware dump collection for debugging purposes. The async worker
may race with suspend flow and fail to get NIC access, resulting in
the following warning:
"Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff)"

Fix this by switching to the sync version to ensure the dump
completes before proceeding with the suspend flow, avoiding
potential race issues.

Signed-off-by: Daniel Gabay <daniel.gabay@...el.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@...el.com>
Link: https://patch.msgid.link/20241010140328.9aae318cd593.I4b322009f39489c0b1d8893495c887870f73ed9c@changeid
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/intel/iwlwifi/fw/init.c | 4 +++-
 drivers/net/wireless/intel/iwlwifi/mvm/d3.c  | 2 ++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/init.c b/drivers/net/wireless/intel/iwlwifi/fw/init.c
index 2ecec00db9da7..263560f259778 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/init.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/init.c
@@ -35,10 +35,12 @@ void iwl_fw_runtime_init(struct iwl_fw_runtime *fwrt, struct iwl_trans *trans,
 }
 IWL_EXPORT_SYMBOL(iwl_fw_runtime_init);
 
+/* Assumes the appropriate lock is held by the caller */
 void iwl_fw_runtime_suspend(struct iwl_fw_runtime *fwrt)
 {
 	iwl_fw_suspend_timestamp(fwrt);
-	iwl_dbg_tlv_time_point(fwrt, IWL_FW_INI_TIME_POINT_HOST_D3_START, NULL);
+	iwl_dbg_tlv_time_point_sync(fwrt, IWL_FW_INI_TIME_POINT_HOST_D3_START,
+				    NULL);
 }
 IWL_EXPORT_SYMBOL(iwl_fw_runtime_suspend);
 
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/d3.c b/drivers/net/wireless/intel/iwlwifi/mvm/d3.c
index 24c1666b2c88a..80b6e646abe18 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/d3.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/d3.c
@@ -1380,7 +1380,9 @@ int iwl_mvm_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
 
 	iwl_mvm_pause_tcm(mvm, true);
 
+	mutex_lock(&mvm->mutex);
 	iwl_fw_runtime_suspend(&mvm->fwrt);
+	mutex_unlock(&mvm->mutex);
 
 	return __iwl_mvm_suspend(hw, wowlan, false);
 }
-- 
2.43.0