[PATCH 6.7 303/713] wifi: mt76: mt792x: fix a potential loading failure of the 6Ghz channel config from ACPI

Sasha Levin
2024-03-24T22:52:20Z

From: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>

[ Upstream commit 07ce1d46372489d90f9cccebb3277d1af801c4b9 ]

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>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../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 303c0f5c9c662..c4e3bfcc519e2 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
--
2.43.0