linux-kernel - [PATCH 2/2] wifi: ath11k: unmap the CE in ath11k_ahb

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Message-ID: <20240430-ce-unmap-v1-2-e468328f95d9@quicinc.com>
Date: Tue, 30 Apr 2024 06:30:21 -0700
From: Jeff Johnson <quic_jjohnson@...cinc.com>
To: Kalle Valo <kvalo@...nel.org>, Jeff Johnson <jjohnson@...nel.org>
CC: <linux-wireless@...r.kernel.org>, <ath11k@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Jeff Johnson <quic_jjohnson@...cinc.com>
Subject: [PATCH 2/2] wifi: ath11k: unmap the CE in ath11k_ahb_probe() error
 path

Currently, in ath11k_ahb_probe(), if a failure occurs after
ath11k_ahb_ce_remap() is called, and if hw_params->ce_remap is
enabled, the CE register memory is not unmapped. So add a call to
ath11k_ahb_ce_unmap() in the error path.

This issue was identified by smatch/smatch_scripts/kchecker:

drivers/net/wireless/ath/ath11k/ahb.c:1218 ath11k_ahb_probe() warn: 'ab->mem_ce' from ioremap() not released on lines: 1218.

Since this is a rare error path with no simple way to test, and since
the change is trivial to review, compile tested only.

Signed-off-by: Jeff Johnson <quic_jjohnson@...cinc.com>
---
 drivers/net/wireless/ath/ath11k/ahb.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath11k/ahb.c b/drivers/net/wireless/ath/ath11k/ahb.c
index aa62ed710090..ef0ede16aac8 100644
--- a/drivers/net/wireless/ath/ath11k/ahb.c
+++ b/drivers/net/wireless/ath/ath11k/ahb.c
@@ -1177,7 +1177,7 @@ static int ath11k_ahb_probe(struct platform_device *pdev)
 
 	ret = ath11k_ahb_fw_resources_init(ab);
 	if (ret)
-		goto err_core_free;
+		goto err_ce_unmap;
 
 	ret = ath11k_ahb_setup_smp2p_handle(ab);
 	if (ret)
@@ -1229,6 +1229,9 @@ static int ath11k_ahb_probe(struct platform_device *pdev)
 err_fw_deinit:
 	ath11k_ahb_fw_resource_deinit(ab);
 
+err_ce_unmap:
+	ath11k_ahb_ce_unmap(ab);
+
 err_core_free:
 	ath11k_core_free(ab);
 	platform_set_drvdata(pdev, NULL);

-- 
2.42.0