This is a note to let you know that I've just added the patch titled
wifi: mt76: mt792x: fix a potential loading failure of the 6Ghz channel config from ACPI
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wifi-mt76-mt792x-fix-a-potential-loading-failure-of-.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b499cd1ad7199f5d50635d0bc4504c4bdaebe300
Author: Ming Yen Hsieh <mingyen.hsieh@xxxxxxxxxxxx>
Date: Tue Jan 16 10:48:55 2024 +0800
wifi: mt76: mt792x: fix a potential loading failure of the 6Ghz channel config from ACPI
[ 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@xxxxxxxxxxxx>
Signed-off-by: Leon Yen <leon.yen@xxxxxxxxxxxx>
Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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
