linux-kernel - Re: [PATCH] usbhid: Fix lockdep unannotated irqs-off warning

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Message-ID: <alpine.LNX.2.00.1603020936520.3656@cbobk.fhfr.pm>
Date:	Wed, 2 Mar 2016 09:37:21 +0100 (CET)
From:	Jiri Kosina <jikos@...nel.org>
To:	Sedat Dilek <sedat.dilek@...il.com>
cc:	Alan Stern <stern@...land.harvard.edu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Tejun Heo <tj@...nel.org>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Andy Lutomirski <luto@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-usb@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] usbhid: Fix lockdep unannotated irqs-off warning

On Wed, 2 Mar 2016, Sedat Dilek wrote:
> 
> static bool start_flush_work(struct work_struct *work, struct wq_barrier *barr)
> {
>         struct worker *worker = NULL;
>         struct worker_pool *pool;
>         struct pool_workqueue *pwq;
> 
>         might_sleep();
> 
>         local_irq_disable();
>         pool = get_work_pool(work);
>         if (!pool) {
>                 local_irq_enable();
>                 return false;
>         }
> 
>         spin_lock(&pool->lock); <--- XXX: spin_lock_irq() ???

No, this is fine. IRQs are unconditionally disabled a few lines above.

-- 
Jiri Kosina
SUSE Labs