linux-kernel - Re: [PATCH net-next 1/2] r8152: If inaccessible at resume time, issue a reset

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Date: Tue, 21 May 2024 11:13:50 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Douglas Anderson <dianders@...omium.org>, "David S . Miller"
	 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	 <kuba@...nel.org>, Hayes Wang <hayeswang@...ltek.com>
Cc: danielgeorgem@...gle.com, Andrew Lunn <andrew@...n.ch>, Grant Grundler
 <grundler@...omium.org>, Heiner Kallweit <hkallweit1@...il.com>, 
 linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
 netdev@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] r8152: If inaccessible at resume time,
 issue a reset

On Mon, 2024-05-20 at 13:41 -0700, Douglas Anderson wrote:
> If we happened to get a USB transfer error during the transition to
> suspend then the usb_queue_reset_device() that r8152_control_msg()
> calls will get dropped on the floor. This is because
> usb_lock_device_for_reset() (which usb_queue_reset_device() uses)
> silently fails if it's called when a device is suspended or if too
> much time passes.
> 
> Let's resolve this by resetting the device ourselves in r8152's
> resume() function.
> 
> NOTE: due to timing, it's _possible_ that we could end up with two USB
> resets: the one queued previously and the one called from the resume()
> patch. This didn't happen in test cases I ran, though it's conceivably
> possible. We can't easily know if this happened since
> usb_queue_reset_device() can just silently drop the reset request. In
> any case, it's not expected that this is a problem since the two
> resets can't run at the same time (because of the device lock) and it
> should be OK to reset the device twice. If somehow the double-reset
> causes problems we could prevent resets from being queued up while
> suspend is running.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

## Form letter - net-next-closed

The merge window for v6.10 has begun and we have already posted our
pull
request. Therefore net-next is closed for new drivers, features, code
refactoring and optimizations. We are currently accepting bug fixes
only.

Please repost when net-next reopens after May 26th.

RFC patches sent for review only are obviously welcome at any time.

See:
https://www.kernel.org/doc/html/next/process/maintainer-netdev.html#development-cycle