linux-kernel - [PATCH AUTOSEL 6.1 27/61] wifi: iwlwifi: fw: avoid bad FW config on RXQ DMA failure

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Message-ID: <20240801002803.3935985-27-sashal@kernel.org>
Date: Wed, 31 Jul 2024 20:25:45 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Johannes Berg <johannes.berg@...el.com>,
	Miri Korenblit <miriam.rachel.korenblit@...el.com>,
	Sasha Levin <sashal@...nel.org>,
	kvalo@...nel.org,
	linux-wireless@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 27/61] wifi: iwlwifi: fw: avoid bad FW config on RXQ DMA failure

From: Johannes Berg <johannes.berg@...el.com>

[ Upstream commit 6ccfc7c49b6d99e3b857afb064e56a004b0a5e03 ]

In practice, iwl_trans_get_rxq_dma_data() will not fail,
it only can do that if called with the wrong arguments.
But it does have an error value and doesn't initialize
the argument when it fails, so don't use the value then.

Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@...el.com>
Link: https://msgid.link/20240512072733.faf3a1b87589.I77c950173cb914676fbd28483e5ef420bb9f1bc9@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 | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/init.c b/drivers/net/wireless/intel/iwlwifi/fw/init.c
index 135bd48bfe9fa..d8b083be5b6b5 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/init.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/init.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 /*
  * Copyright (C) 2017 Intel Deutschland GmbH
- * Copyright (C) 2019-2021 Intel Corporation
+ * Copyright (C) 2019-2021, 2024 Intel Corporation
  */
 #include "iwl-drv.h"
 #include "runtime.h"
@@ -135,7 +135,9 @@ int iwl_configure_rxq(struct iwl_fw_runtime *fwrt)
 		struct iwl_trans_rxq_dma_data data;
 
 		cmd->data[i].q_num = i + 1;
-		iwl_trans_get_rxq_dma_data(fwrt->trans, i + 1, &data);
+		ret = iwl_trans_get_rxq_dma_data(fwrt->trans, i + 1, &data);
+		if (ret)
+			goto out;
 
 		cmd->data[i].fr_bd_cb = cpu_to_le64(data.fr_bd_cb);
 		cmd->data[i].urbd_stts_wrptr =
@@ -149,6 +151,7 @@ int iwl_configure_rxq(struct iwl_fw_runtime *fwrt)
 
 	ret = iwl_trans_send_cmd(fwrt->trans, &hcmd);
 
+out:
 	kfree(cmd);
 
 	if (ret)
-- 
2.43.0