mt76: mt76x0u: do not reset radio on resume

On some machines mt76x0u firmware can hung during resume,
what result on messages like below:

[  475.480062] mt76x0 1-8:1.0: Error: MCU response pre-completed!
[  475.990066] mt76x0 1-8:1.0: Error: send MCU cmd failed:-110
[  475.990075] mt76x0 1-8:1.0: Error: MCU response pre-completed!
[  476.500003] mt76x0 1-8:1.0: Error: send MCU cmd failed:-110
[  476.500012] mt76x0 1-8:1.0: Error: MCU response pre-completed!
[  477.010046] mt76x0 1-8:1.0: Error: send MCU cmd failed:-110
[  477.010055] mt76x0 1-8:1.0: Error: MCU response pre-completed!
[  477.529997] mt76x0 1-8:1.0: Error: send MCU cmd failed:-110
[  477.530006] mt76x0 1-8:1.0: Error: MCU response pre-completed!
[  477.824907] mt76x0 1-8:1.0: Error: send MCU cmd failed:-71
[  477.824916] mt76x0 1-8:1.0: Error: MCU response pre-completed!
[  477.825029] usb 1-8: USB disconnect, device number 6

and possible whole system freeze.

This can be avoided, if we do not perform mt76x0_chip_onoff() reset.

Cc: stable@vger.kernel.org
Fixes: 134b2d0d1fcf ("mt76x0: init files")
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/mediatek/mt76/mt76x0/usb.c b/drivers/net/wireless/mediatek/mt76/mt76x0/usb.c
index 627ed1fc7b1584414b97f9eef9a5d81543dc9d74..645f4d15fb619635d3f2bdc067eea3e308c889d8 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/mt76x0/usb.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x0/usb.c
@@ -136,11 +136,11 @@ static const struct ieee80211_ops mt76x0u_ops = {
        .release_buffered_frames = mt76_release_buffered_frames,
 };
 
-static int mt76x0u_init_hardware(struct mt76x02_dev *dev)
+static int mt76x0u_init_hardware(struct mt76x02_dev *dev, bool reset)
 {
        int err;
 
-       mt76x0_chip_onoff(dev, true, true);
+       mt76x0_chip_onoff(dev, true, reset);
 
        if (!mt76x02_wait_for_mac(&dev->mt76))
                return -ETIMEDOUT;
@@ -173,7 +173,7 @@ static int mt76x0u_register_device(struct mt76x02_dev *dev)
        if (err < 0)
                goto out_err;
 
-       err = mt76x0u_init_hardware(dev);
+       err = mt76x0u_init_hardware(dev, true);
        if (err < 0)
                goto out_err;
 
@@ -309,7 +309,7 @@ static int __maybe_unused mt76x0_resume(struct usb_interface *usb_intf)
        if (ret < 0)
                goto err;
 
-       ret = mt76x0u_init_hardware(dev);
+       ret = mt76x0u_init_hardware(dev, false);
        if (ret)
                goto err;