linux-kernel - Re: [PATCH 0/3] firewire: ohci: switch to threaded IRQ handler for SelfIDComplete event

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Message-ID: <20250825002803.GA283774@workstation.local>
Date: Mon, 25 Aug 2025 09:28:03 +0900
From: Takashi Sakamoto <o-takashi@...amocchi.jp>
To: linux1394-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] firewire: ohci: switch to threaded IRQ handler for
 SelfIDComplete event

On Sat, Aug 23, 2025 at 12:09:51PM +0900, Takashi Sakamoto wrote:
> Hi,
> 
> This patchset replaces the module-local workqueue with a threaded IRQ
> handler for handling the SelfIDComplete event in the 1394 OHCI PCI driver.
> 
> The SelfIDComplete event is the first step in maintaining bus topology.
> It occurs after a bus reset or when the topology changes, and must be
> processed outside the hard IRQ context due to the latency involved in
> enumerating the SelfID sequence. Historically, this was handled by a
> module-local workqueue with the WQ_MEM_RECLAIM flag. A threaded IRQ
> handler offers a cleaner and more reliable solution, leveraging the
> kernel's common infrastructure and eliminating the need for maintaining
> a custom workqueue.
> 
> Takashi Sakamoto (3):
>   firewire: ohci: move self_id_complete tracepoint after validating
>     register
>   firewire: ohci: use threaded IRQ handler to handle SelfIDComplete
>     event
>   firewire: ohci: remove module-local workqueue
> 
>  drivers/firewire/ohci.c | 61 +++++++++++++++++------------------------
>  1 file changed, 25 insertions(+), 36 deletions(-)

Applied to for-next branch.


Regards

Takashi Sakamoto