linux-kernel - Re: [PATCH] devcoredump: Fix circular locking dependency with devcd->mutex.

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Message-ID: <2025100655-prankish-parking-9059@gregkh>
Date: Mon, 6 Oct 2025 11:24:16 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Maarten Lankhorst <dev@...khorst.se>
Cc: Mukesh Ojha <mukesh.ojha@....qualcomm.com>,
	linux-kernel@...r.kernel.org, intel-xe@...ts.freedesktop.org,
	Mukesh Ojha <quic_mojha@...cinc.com>,
	Johannes Berg <johannes@...solutions.net>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>, stable@...r.kernel.org,
	Matthew Brost <matthew.brost@...el.com>
Subject: Re: [PATCH] devcoredump: Fix circular locking dependency with
 devcd->mutex.

On Mon, Oct 06, 2025 at 11:11:01AM +0200, Maarten Lankhorst wrote:
> >> @@ -401,13 +424,20 @@ void dev_coredumpm_timeout(struct device *dev, struct module *owner,
> >>  
> >>  	dev_set_uevent_suppress(&devcd->devcd_dev, false);
> >>  	kobject_uevent(&devcd->devcd_dev.kobj, KOBJ_ADD);
> >> -	INIT_DELAYED_WORK(&devcd->del_wk, devcd_del);
> >> -	schedule_delayed_work(&devcd->del_wk, timeout);
> >> +
> >> +	/*
> >> +	 * Safe to run devcd_del() now that we are done with devcd_dev.
> >> +	 * Alternatively we could have taken a ref on devcd_dev before
> >> +	 * dropping the lock.
> >> +	 */
> >> +	devcd->init_completed = true;
> >>  	mutex_unlock(&devcd->mutex);
> >>  	return;
> >>   put_device:
> >> -	put_device(&devcd->devcd_dev);
> >>  	mutex_unlock(&devcd->mutex);
> >> +	cancel_delayed_work_sync(&devcd->del_wk);
> >> +	put_device(&devcd->devcd_dev);
> >> +
> > 
> > Acked-by: Mukesh Ojha <mukesh.ojha@....qualcomm.com>
> 
> Thanks, through what tree can this be merged?

I can look into doing that after -rc1 is out.

thanks,

greg k-h