Re: rt2x00 regression

From: Stanislaw Gruszka <sgruszka@redhat.com>
To: Exuvo <exuvo@exuvo.se>
Cc: linux-wireless@vger.kernel.org,
	Helmut Schaa <helmut.schaa@googlemail.com>
Subject: Re: rt2x00 regression
Date: Tue, 3 Dec 2019 08:57:36 +0100	[thread overview]
Message-ID: <20191203075736.GA701@redhat.com> (raw)
In-Reply-To: <CA+GwT0B5SyRZnGLqwqOeuJK4CWMVc=dKaWre9VN8KQC6kBzKGw@mail.gmail.com>

On Mon, Dec 02, 2019 at 05:40:20PM +0100, Exuvo wrote:
> Sorry for the late reply
> 
> The patch for increasing the amount did not work, i'll get around to
> testing with the commit reverted.

So, revert of that commit makes the problem gone ?

> As an aside what function can i call at that point in the code to print the
> value in num_proto_errs? I assume some kernel special printf?
It's printk. You can add line like this to print values:

printk("status %d num_proto_errs %u\n", status, rt2x00dev->num_proto_errs);

Stanislaw

> On Fri, 27 Sep 2019, 10:03 Stanislaw Gruszka, <sgruszka@redhat.com> wrote:
> 
> > On Thu, Sep 26, 2019 at 06:32:23PM +0200, Anton Olsson wrote:
> > > Hello I have a USB based ID 148f:3070 Ralink Technology, Corp.
> > RT2870/RT3070 Wireless Adapter, that stops working with recent kernels. It
> > works on kernel 5.1.15 and does not work with 5.2.7 or 5.3.1 (I have not
> > tested other versions). I use it in AP mode.
> > >
> > > I found this similar bug report
> > https://marc.info/?l=linux-wireless&m=156630037103575&w=2 but that did
> > not have related error messages so I assume this is different?
> > >
> > > Logs of working kernel 5.1.15-arch1-1-ARCH.
> > > [   78.680555] ieee80211 phy0: rt2x00_set_rt: Info - RT chipset 3070,
> > rev 0201 detected
> > > [   78.690992] ieee80211 phy0: rt2x00_set_rf: Info - RF chipset 0005
> > detected
> > > [   78.799625] ieee80211 phy0: Selected rate control algorithm
> > 'minstrel_ht'
> > > sep 26 17:13:03 kernel: usbcore: registered new interface driver
> > rt2800usb
> > > sep 26 17:13:03 systemd[1]: Found device RT2870/RT3070 Wireless Adapter.
> > > [  113.812454] ieee80211 phy0: rt2x00lib_request_firmware: Info -
> > Loading firmware file 'rt2870.bin'
> > > [  113.905279] ieee80211 phy0: rt2x00lib_request_firmware: Info -
> > Firmware detected - version: 0.36
> > > [  114.028703] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor
> > Request 0x06 failed for offset 0x0404 with error -71
> > >
> > > The last error there does not seem to affect the operation of the device.
> > >
> > > Logs of not working with kernel 5.3.1, 5.2.7 has similar output.
> > > sep 26 17:06:12 kernel: ieee80211 phy0: rt2x00_set_rt: Info - RT chipset
> > 3070, rev 0201 detected
> > > sep 26 17:06:12 kernel: ieee80211 phy0: rt2x00_set_rf: Info - RF chipset
> > 0005 detected
> > > sep 26 17:06:12 kernel: ieee80211 phy0: Selected rate control algorithm
> > 'minstrel_ht'
> > > sep 26 17:06:12 kernel: usbcore: registered new interface driver
> > rt2800usb
> > > sep 26 17:06:12 systemd[1]: Found device RT2870/RT3070 Wireless Adapter.
> > > sep 26 17:06:21 ieee80211 phy0: rt2x00lib_request_firmware: Info -
> > Loading firmware file 'rt2870.bin'
> > > sep 26 17:06:21 ieee80211 phy0: rt2x00lib_request_firmware: Info -
> > Firmware detected - version: 0.36
> > > sep 26 17:06:21 ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor
> > Request 0x06 failed for offset 0x0404 with>
> > > sep 26 17:06:22 ieee80211 phy0: rt2800_wait_csr_ready: Error - Unstable
> > hardware
> > > sep 26 17:06:22 ieee80211 phy0: rt2800usb_set_device_state: Error -
> > Device failed to enter state 4 (-5)
> > >
> > > Unable to bring up the network interface here.
> >
> > This most likely is the problem introduced by commit:
> >
> > commit e383c70474db32b9d4a3de6dfbd08784d19e6751
> > Author: Stanislaw Gruszka <sgruszka@redhat.com>
> > Date:   Tue Mar 12 10:51:42 2019 +0100
> >
> >     rt2x00: check number of EPROTO errors
> >
> > Plase check below patch that increase number of EPROTO checks
> > before marking device removed. If it does not help, plese
> > check if reverting above commits helps.
> >
> > diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00usb.c
> > b/drivers/net/wireless/ralink/rt2x00/rt2x00usb.c
> > index bc2dfef0de22..215c3f092306 100644
> > --- a/drivers/net/wireless/ralink/rt2x00/rt2x00usb.c
> > +++ b/drivers/net/wireless/ralink/rt2x00/rt2x00usb.c
> > @@ -30,7 +30,7 @@ static bool rt2x00usb_check_usb_error(struct rt2x00_dev
> > *rt2x00dev, int status)
> >         else
> >                 rt2x00dev->num_proto_errs = 0;
> >
> > -       if (rt2x00dev->num_proto_errs > 3)
> > +       if (rt2x00dev->num_proto_errs > 8)
> >                 return true;
> >
> >         return false;
> >