linux-kernel - Re: [PATCH v3] irq/core: synchronize irq

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Message-ID: <b8e4951a-212a-ea30-662-b13a65cad3b7@pcs.com>
Date:   Tue, 10 May 2022 14:58:48 +0200
From:   Thomas Pfaff <tpfaff@....com>
To:     Thomas Gleixner <tglx@...utronix.de>
CC:     <linux-kernel@...r.kernel.org>, <linux-rt-users@...r.kernel.org>
Subject: Re: [PATCH v3] irq/core: synchronize irq_thread startup



On Tue, 10 May 2022, Thomas Gleixner wrote:

> It does matter whether the synchronization is done via
> __synchronize_hardirq() or via synchronize_irq(). The latter ensured
> that the thread reached the thread function and handled the pending
> wakeup _before_ kthread_stop() become true.
> 
> So the fix is required to undo the damage created by 519cc8652b3a.
> 
> The synchronize_irq() after free_irq() is a completely different
> problem.

Thank you for the clarification.
I was unsure if I missed something.

    Thomas