On Tue, Jan 14, 2014 at 07:28:39PM +0100, Sergei Antonov wrote:
> Hello!
> I use a USB Wi-Fi adapter identified as follows.
>
> usb 2-4: new high-speed USB device number 5 using ehci-pci
> usb 2-4: New USB device found, idVendor=148f, idProduct=5370
> usb 2-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> usb 2-4: Product: 802.11 n WLAN
> usb 2-4: Manufacturer: Ralink
> usb 2-4: SerialNumber: 1.0
> usb 2-4: reset high-speed USB device number 5 using ehci-pci
> ieee80211 phy3: rt2x00_set_rt: Info - RT chipset 5390, rev 0502 detected
> ieee80211 phy3: rt2x00_set_rf: Info - RF chipset 5370 detected
>
> It worked well with older kernels and does not with newer kernels.
> Specifically it fails to find any AP when scanning.
> The first bad commit is:
>
> commit 76773f301f2210dcc20c466aebda7118062673eb
> Author: Gabor Juhos <juhosg@xxxxxxxxxxx>
> Date: Sat Aug 17 14:09:30 2013 +0200
>
> rt2x00: rt2800lib: use a MCU command for frequency adjustment on USB devices
>
> According to the Ralink driver, there is an MCU
> command which can be used to send the frequency
> offset value directly to the USB device without
> going through the RFCSR writing sequence.
>
> Based on the DPO_RT5572_LinuxSTA_2.6.0.1_20120629
> driver.
>
> Reference:
> RTMPAdjustFrequencyOffset function in common/rt_rf.c
>
> Signed-off-by: Gabor Juhos <juhosg@xxxxxxxxxxx>
> Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>
>
> After I removed this special USB handling (see the patch) the adapter
> works again.
Thanks for bisecting! Could you check if following patch fixes the
issue?
Thanks
Stanislaw
diff --git a/drivers/net/wireless/rt2x00/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c
index 776aff3..5c06836 100644
--- a/drivers/net/wireless/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/rt2x00/rt2800lib.c
@@ -1902,13 +1902,13 @@ static void rt2800_adjust_freq_offset(struct rt2x00_dev *rt2x00dev)
if (rfcsr == prev_rfcsr)
return;
+ prev_freq_offset = rt2x00_get_field8(prev_rfcsr, RFCSR17_CODE);
if (rt2x00_is_usb(rt2x00dev)) {
rt2800_mcu_request(rt2x00dev, MCU_FREQ_OFFSET, 0xff,
- freq_offset, prev_rfcsr);
+ freq_offset, prev_freq_offset);
return;
}
- prev_freq_offset = rt2x00_get_field8(prev_rfcsr, RFCSR17_CODE);
while (prev_freq_offset != freq_offset) {
if (prev_freq_offset < freq_offset)
prev_freq_offset++;
--
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