linux-kernel - Re: [PATCH PREEMPT RT] rt-mutex: fix deadlock in device mapper

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Date:   Tue, 21 Nov 2017 22:20:51 +0100
From:   Mike Galbraith <efault@....de>
To:     Mikulas Patocka <mpatocka@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Siewior <bigeasy@...utronix.de>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-rt-users@...r.kernel.org
Subject: Re: [PATCH PREEMPT RT] rt-mutex: fix deadlock in device mapper

On Tue, 2017-11-21 at 14:56 -0500, Mikulas Patocka wrote:
> 
> If we don't have any reason why it is needed to unplug block requests when 
> a spinlock is taken - so let's not do this.

That's perfectly fine.  I guess I shouldn't have even mentioned having
encountered unplug at mutex being insufficient.

	-Mike