linux-kernel - Re: [PATCH v1 0/1] usb: gadget: dummy_hcd: Fix regression due to hrtimer migration

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Message-ID: <5d7266d4-3349-4414-99c1-4c6154e69292@rowland.harvard.edu>
Date: Wed, 26 Jun 2024 10:00:22 -0400
From: Alan Stern <stern@...land.harvard.edu>
To: Marcello Sylvester Bauer <marcello.bauer@...ements.com>
Cc: linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
  Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
  Uwe Kleine-Koenig <u.kleine-koenig@...gutronix.de>,
  Thomas Gleixner <tglx@...utronix.de>,
  Matthias Stoeckl <matthias.stoeckl@...unet.com>
Subject: Re: [PATCH v1 0/1] usb: gadget: dummy_hcd: Fix regression due to
 hrtimer migration

On Wed, Jun 26, 2024 at 03:47:19PM +0200, Marcello Sylvester Bauer wrote:
> The kernel CI bots such as syzbot and intel kernel bot reported a
> regression due to the migration of the transfare scheduler from timer
> list to hrtimer. The current assumption is that this is because timer
> list uses soft interrupt context. I have not been able to reproduce the
> regression consistently. So I'm submitting this patch in the hope that
> it solves the issue.
> 
> Do not apply the patch if any bot still reports the problem.

You should send the patch to syzbot and have it run its test.  Then 
you'll know whether the patch works.

Alan Stern

> Marcello Sylvester Bauer (1):
>   usb: gadget: dummy_hcd: make hrtimer expire in soft irq context
> 
>  drivers/usb/gadget/udc/dummy_hcd.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> -- 
> 2.45.2
> 
>