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Date:   Tue, 23 Jul 2019 09:18:07 +0200
From:   Stanislaw Gruszka <sgruszka@redhat.com>
To:     Johannes Stezenbach <js@sig21.net>
Cc:     Lorenzo Bianconi <lorenzo@kernel.org>,
        Felix Fietkau <nbd@nbd.name>, linux-wireless@vger.kernel.org
Subject: Re: mt76x0u blocks resume from suspend
Message-ID: <20190723071806.GA2892@redhat.com>
References: <20190722164020.GA5850@sig21.net>
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Hi

On Mon, Jul 22, 2019 at 06:40:20PM +0200, Johannes Stezenbach wrote:
> I met failure to resume from suspend to RAM with v5.1.19
> and TP-Link Archer T2UH connected to my PC (Asus P8H77-V).
> I tried about a dozen times while trying to figure out the reason,
> the issue happened every time.
> Eventually I connected a serial console and captured this:
> 
> [   87.803576][ T4640] mt76x0u 2-1.6:1.0: vendor request req:06 off:ac80 failed:-110
> [   91.030328][ T4640] mt76x0u 2-1.6:1.0: vendor request req:07 off:b000 failed:-110
> [   94.256950][ T4640] mt76x0u 2-1.6:1.0: vendor request req:06 off:b000 failed:-110
> [   97.483579][ T4640] mt76x0u 2-1.6:1.0: vendor request req:06 off:aca0 failed:-110
> (repeats)
> [  107.492106][    C0] Call Trace:
> [  107.495293][    C0]  ? __schedule+0x381/0xa30
> [  107.499706][    C0]  schedule+0x36/0x90
> [  107.503575][    C0]  schedule_timeout+0x1e8/0x4c0
> [  107.508310][    C0]  ? collect_expired_timers+0xb0/0xb0
> [  107.513593][    C0]  wait_for_common+0x15f/0x190
> [  107.518249][    C0]  ? wake_up_q+0x80/0x80
> [  107.522412][    C0]  usb_start_wait_urb+0x82/0x160
> [  107.527222][    C0]  ? wait_for_common+0x38/0x190
> [  107.531961][    C0]  usb_control_msg+0xdc/0x140
> [  107.536542][    C0]  __mt76u_vendor_request+0xc4/0x100 [mt76_usb]
> [  107.542687][    C0]  mt76u_copy+0x8b/0xb0 [mt76_usb]
> [  107.547721][    C0]  mt76x02_mac_shared_key_setup+0xdf/0x130 [mt76x02_lib]
<snip>
> The whole machine is hanging at this point. without serial console
> my only choice was to press the reset button.  At least mt76x0u should
> bail out with an error and not block the resume completely.
> Unplugging the hardware also didn't cause it to bail.

I recently sent fix for that
https://lore.kernel.org/linux-wireless/1563446290-2813-1-git-send-email-sgruszka@redhat.com/raw

Stanislaw