Re: [PATCH net] net: ipa: fix stalled modem TX queue after runtime resume

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by David S. Miller <davem@xxxxxxxxxxxxx>:

On Sat, 15 Aug 2026 06:03:02 +0200 you wrote:
> ipa_start_xmit() unconditionally stops the TX queue before calling
> pm_runtime_get(), relying on the wake scheduled by runtime resume
> (ipa_modem_wake_queue_work()) to restart it once power is ACTIVE.
> But that work is queued from within the runtime resume callback,
> before the device's power state reaches RPM_ACTIVE, so it can run
> while the device is still RPM_RESUMING.  The wake is then consumed
> too early: the transmit it restarts stops the queue again,
> pm_runtime_get() returns -EINPROGRESS without arranging any future
> wake (deferred_resume exists only for RPM_SUSPENDING), and after the
> resume completes nothing is left to wake the queue.  Transmit stalls
> permanently: packets pile up in the qdisc behind the stopped queue,
> the device runtime-suspends, and since the netdev registers no
> ndo_tx_timeout the watchdog never fires.  Observed on SM7635
> (Fairphone 6) as the cellular data path going permanently deaf
> within hours, RX included, since nothing resumes the suspended
> endpoints.
> 
> [...]

Here is the summary with links:
  - [net] net: ipa: fix stalled modem TX queue after runtime resume
    https://git.kernel.org/netdev/net/c/c8c69c9a6d81

You are awesome, thank you!
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