Patch "wifi: mt76: mt7996: add sanity checks for background radar trigger" has been added to the 6.9-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    wifi: mt76: mt7996: add sanity checks for background radar trigger

to the 6.9-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-mt7996-add-sanity-checks-for-background-ra.patch
and it can be found in the queue-6.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 47e4d0037e17e7653b2c72b236ed5091635ef38b
Author: StanleyYP Wang <StanleyYP.Wang@xxxxxxxxxxxx>
Date:   Wed Mar 20 19:09:16 2024 +0800

    wifi: mt76: mt7996: add sanity checks for background radar trigger
    
    [ Upstream commit ec55d8e7dfea92daff87f5c01689633f8c4e6a62 ]
    
    Check if background radar is enabled or not before manually triggering it,
    and also add more checks in radar detected event.
    
    Signed-off-by: StanleyYP Wang <StanleyYP.Wang@xxxxxxxxxxxx>
    Signed-off-by: Shayne Chen <shayne.chen@xxxxxxxxxxxx>
    Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/debugfs.c b/drivers/net/wireless/mediatek/mt76/mt7996/debugfs.c
index 9bd953586b041..62c03d088925c 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/debugfs.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/debugfs.c
@@ -225,6 +225,11 @@ mt7996_radar_trigger(void *data, u64 val)
 	if (val > MT_RX_SEL2)
 		return -EINVAL;
 
+	if (val == MT_RX_SEL2 && !dev->rdd2_phy) {
+		dev_err(dev->mt76.dev, "Background radar is not enabled\n");
+		return -EINVAL;
+	}
+
 	return mt7996_mcu_rdd_cmd(dev, RDD_RADAR_EMULATE,
 				  val, 0, 0);
 }
diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
index e86c05d0eecc9..bc3b2babb094d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
@@ -355,7 +355,10 @@ mt7996_mcu_rx_radar_detected(struct mt7996_dev *dev, struct sk_buff *skb)
 	if (r->band_idx >= ARRAY_SIZE(dev->mt76.phys))
 		return;
 
-	if (dev->rdd2_phy && r->band_idx == MT_RX_SEL2)
+	if (r->band_idx == MT_RX_SEL2 && !dev->rdd2_phy)
+		return;
+
+	if (r->band_idx == MT_RX_SEL2)
 		mphy = dev->rdd2_phy->mt76;
 	else
 		mphy = dev->mt76.phys[r->band_idx];