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From: Mingyen Hsieh <mingyen.hsieh@mediatek.com>
To: <nbd@nbd.name>, <lorenzo@kernel.org>
CC: <deren.wu@mediatek.com>, <Sean.Wang@mediatek.com>,
	<Soul.Huang@mediatek.com>, <Leon.Yen@mediatek.com>,
	<Eric-SY.Chang@mediatek.com>, <km.lin@mediatek.com>,
	<robin.chiu@mediatek.com>, <ch.yeh@mediatek.com>, <posh.sun@mediatek.com>,
	<Quan.Zhou@mediatek.com>, <Ryder.Lee@mediatek.com>,
	<Shayne.Chen@mediatek.com>, <linux-wireless@vger.kernel.org>,
	<linux-mediatek@lists.infradead.org>, Ming Yen Hsieh
	<mingyen.hsieh@mediatek.com>, Leon Yen <leon.yen@mediatek.com>
Subject: [PATCH v1 2/4] wifi: mt76: mt792x: fix a potential loading failure of the 6Ghz channel config from ACPI
Date: Fri, 22 Dec 2023 16:53:36 +0800
Message-ID: <20231222085338.4530-3-mingyen.hsieh@mediatek.com>
In-Reply-To: <20231222085338.4530-1-mingyen.hsieh@mediatek.com>
References: <20231222085338.4530-1-mingyen.hsieh@mediatek.com>
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From: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>

In some case, the MTCL table will exist, but MTDS table will not.
So the SAR will init fail. This patch make MTCL and MTDS can exist
with no dependence.

Fixes: f965333e491e ("mt76: mt7921: introduce ACPI SAR support")
Signed-off-by: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>
Signed-off-by: Leon Yen <leon.yen@mediatek.com>
---
 .../wireless/mediatek/mt76/mt792x_acpi_sar.c  | 26 ++++++++++---------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt792x_acpi_sar.c b/drivers/net/wireless/mediatek/mt76/mt792x_acpi_sar.c
index e7afea87e82e..8fee3d481df0 100644
--- a/drivers/net/wireless/mediatek/mt76/mt792x_acpi_sar.c
+++ b/drivers/net/wireless/mediatek/mt76/mt792x_acpi_sar.c
@@ -66,13 +66,15 @@ mt792x_acpi_read(struct mt792x_dev *dev, u8 *method, u8 **tbl, u32 *len)
 }
 
 /* MTCL : Country List Table for 6G band */
-static void
+static int
 mt792x_asar_acpi_read_mtcl(struct mt792x_dev *dev, u8 **table, u8 *version)
 {
-	if (mt792x_acpi_read(dev, MT792x_ACPI_MTCL, table, NULL) < 0)
-		*version = 1;
-	else
-		*version = 2;
+	int ret;
+
+	*version = ((ret = mt792x_acpi_read(dev, MT792x_ACPI_MTCL, table, NULL)) < 0)
+		   ? 1 : 2;
+
+	return ret;
 }
 
 /* MTDS : Dynamic SAR Power Table */
@@ -166,16 +168,16 @@ int mt792x_init_acpi_sar(struct mt792x_dev *dev)
 	if (!asar)
 		return -ENOMEM;
 
-	mt792x_asar_acpi_read_mtcl(dev, (u8 **)&asar->countrylist, &asar->ver);
+	ret = mt792x_asar_acpi_read_mtcl(dev, (u8 **)&asar->countrylist, &asar->ver);
+	if (ret) {
+		devm_kfree(dev->mt76.dev, asar->countrylist);
+		asar->countrylist = NULL;
+	}
 
-	/* MTDS is mandatory. Return error if table is invalid */
 	ret = mt792x_asar_acpi_read_mtds(dev, (u8 **)&asar->dyn, asar->ver);
 	if (ret) {
 		devm_kfree(dev->mt76.dev, asar->dyn);
-		devm_kfree(dev->mt76.dev, asar->countrylist);
-		devm_kfree(dev->mt76.dev, asar);
-
-		return ret;
+		asar->dyn = NULL;
 	}
 
 	/* MTGS is optional */
@@ -290,7 +292,7 @@ int mt792x_init_acpi_sar_power(struct mt792x_phy *phy, bool set_default)
 	const struct cfg80211_sar_capa *capa = phy->mt76->hw->wiphy->sar_capa;
 	int i;
 
-	if (!phy->acpisar)
+	if (!phy->acpisar || !((struct mt792x_acpi_sar *)phy->acpisar)->dyn)
 		return 0;
 
 	/* When ACPI SAR enabled in HW, we should apply rules for .frp
-- 
2.18.0