Re: [PATCH 16/21] soundwire: amd: Initialise and cancel IRQ work around manager lifetime

[Lee Jones <lee@kernel.org>]

On Fri, 30 Oct 2026, Mukunda,Vijendar wrote:

> 
> 
> On 10/30/26 16:16, Lee Jones wrote:
> > [You don't often get email from lee@kernel.org. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
> > 
> > amd_sdw_manager_probe() publishes amd_manager via dev_set_drvdata()
> > before initialising amd_sdw_irq_thread and amd_sdw_work, allowing an
> > early interrupt to schedule uninitialised work.  During removal,
> > amd_sdw_manager_remove() only cancels amd_sdw_work without first
> > cancelling amd_sdw_irq_thread, allowing deferred IRQ work to re-queue
> > amd_sdw_work or dereference amd_manager after it is freed.
> > 
> > Initialise both work items before calling dev_set_drvdata() in
> > amd_sdw_manager_probe(), and cancel amd_sdw_irq_thread before
> > amd_sdw_work in amd_sdw_manager_remove().
> > 
> > Fixes: 65f93e4096a0 ("soundwire: amd: add SoundWire manager interrupt handling")
> > Closes: https://sashiko.dev/#/bug/linux-9890e8dc-4b7d-44d3-bfb0-171dc421e28c
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Lee Jones <lee@kernel.org>
> > ---
> >   drivers/soundwire/amd_manager.c | 3 ++-
> >   1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/soundwire/amd_manager.c b/drivers/soundwire/amd_manager.c
> > index 98b09d81f3b8..2e1038ea0f36 100644
> > --- a/drivers/soundwire/amd_manager.c
> > +++ b/drivers/soundwire/amd_manager.c
> > @@ -1185,9 +1185,9 @@ static int amd_sdw_manager_probe(struct platform_device *pdev)
> >                  sdw_bus_master_delete(&amd_manager->bus);
> >                  return ret;
> >          }
> > -       dev_set_drvdata(dev, amd_manager);
> >          INIT_WORK(&amd_manager->amd_sdw_irq_thread, amd_sdw_irq_thread);
> >          INIT_WORK(&amd_manager->amd_sdw_work, amd_sdw_update_slave_status_work);
> > +       dev_set_drvdata(dev, amd_manager);
> The probe-side ordering issue is valid — an interrupt arriving after
> dev_set_drvdata() but before INIT_WORK() could schedule work on an
> uninitialised work_struct.
> 
> The remove-side fix is already posted as part of our v3 patch series:
> 
> https://lore.kernel.org/alsa-devel/20261013085111.2009061-6-Vijendar.Mukunda@amd.com/T/#m60177687bb84758efdd6f5f09eba8ad32f0e4631
> 
> The probe-side fix will be included in our upcoming v4 patch series,
> which contains major driver restructuring and customer-critical bug
> fixes. Merging this patch independently would conflict with v4 and
> complicate the review process.
> 
> Could you please drop this patch? Both issues will be covered by our
> v3/v4 series.

Yes, no problem.

-- 
Lee Jones