linux-kernel - Re: [PATCH] usb: gadget: u_ether: Re-attach netif device to mirror detachment

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Date: Sun, 7 Jan 2024 10:56:22 +0100
From: "Linux regression tracking (Thorsten Leemhuis)"
 <regressions@...mhuis.info>
To: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
 Linux kernel regressions list <regressions@...ts.linux.dev>
Subject: Re: [PATCH] usb: gadget: u_ether: Re-attach netif device to mirror
 detachment

On 18.12.23 17:45, Richard Acayan wrote:
> In 6.7-rc1, there was a netif_device_detach call added to the
> gether_disconnect function. This clears the __LINK_STATE_PRESENT bit of
> the netif device and suppresses pings (ICMP messages) and TCP connection
> requests from the connected host. If userspace temporarily disconnects
> the gadget, such as by temporarily removing configuration in the gadget
> configfs interface, network activity should continue to be processed
> when the gadget is re-connected. Mirror the netif_device_detach call
> with a netif_device_attach call in gether_connect to fix re-connecting
> gadgets.
> 
> Link: https://gitlab.com/postmarketOS/pmaports/-/tree/6002e51b7090aeeb42947e0ca7ec22278d7227d0/main/postmarketos-base-ui/rootfs-usr-lib-NetworkManager-dispatcher.d-50-tethering.sh
> Fixes: f49449fbc21e ("usb: gadget: u_ether: Replace netif_stop_queue with netif_device_detach")
> Signed-off-by: Richard Acayan <mailingradian@...il.com>

Thanks for the report. To be sure the issue doesn't fall through the
cracks unnoticed, I'm adding it to regzbot, the Linux kernel regression
tracking bot:

#regzbot ^introduced f49449fbc21e
#regzbot title usb: gadget: u_ether: network gadgets don't work
#regzbot fix: usb: gadget: u_ether: Re-attach netif device to mirror
detachment
#regzbot ignore-activity

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
That page also explains what to do if mails like this annoy you.