linux-kernel - Re: [PATCH RT 1/1] remoteproc: Prevent schedule while atomic

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Date:   Thu, 30 Mar 2017 08:54:58 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Lionel Debieve <lionel.debieve@...com>,
        linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        tglx@...utronix.de
Subject: Re: [PATCH RT 1/1] remoteproc: Prevent schedule while atomic

On Wed, 29 Mar 2017, Sebastian Andrzej Siewior wrote:

> On 2017-03-22 09:05:58 [-0700], Steven Rostedt wrote:
> > On Wed, 22 Mar 2017 16:18:43 +0100
> > Lionel Debieve <lionel.debieve@...com> wrote:
> > 
> > > Use raw_spin_lock in enable/disable channel as it comes from
> > > interrupt context.
> > > 
> > > BUG: sleeping function called from invalid context at
> > > kernel/locking/rtmutex.c:995
> > > in_atomic(): 1, irqs_disabled(): 128, pid: 307, name: pulseaudio
> > > Preemption disabled at:
> > > [<c01790fc>] __handle_domain_irq+0x4c/0xec
> > > CPU: 0 PID: 307 Comm: pulseaudio
> > > Hardware name: STi SoC with Flattened Device Tree
> > > [<c011046c>] (unwind_backtrace)
> > > [<c010c7f4>] (show_stack)
> > > [<c03d1578>] (dump_stack)
> > > [<c014e440>] (___might_sleep)
> > > [<c08e7f24>] (rt_spin_lock)
> > > [<c069bb04>] (sti_mbox_disable_channel)
> > > [<c069befc>] (sti_mbox_irq_handler)
> > > [<c0179900>] (__handle_irq_event_percpu)
> > > [<c01799dc>] (handle_irq_event_percpu)
> > > [<c0179a78>] (handle_irq_event)
> > > [<c017d1c8>] (handle_fasteoi_irq)
> > > [<c0178c08>] (generic_handle_irq)
> > > [<c017912c>] (__handle_domain_irq)
> > > [<c0101488>] (gic_handle_irq)
> > > 
> > > Signed-off-by: Lionel Debieve <lionel.debieve@...com>
> > 
> > Looks fine to me. Should this go to mainline?
> > 
> > Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> 
> Could this be applied upstream, please? From looking at the thread there
> was no reason not to do so.

Acked-by: Lee Jones <lee.jones@...aro.org>

> > > ---
> > >  drivers/mailbox/mailbox-sti.c | 12 ++++++------
> > >  1 file changed, 6 insertions(+), 6 deletions(-)
> > > 
> > > diff --git a/drivers/mailbox/mailbox-sti.c
> > > b/drivers/mailbox/mailbox-sti.c index 41bcd33..f9674ca 100644
> > > --- a/drivers/mailbox/mailbox-sti.c
> > > +++ b/drivers/mailbox/mailbox-sti.c
> > > @@ -60,7 +60,7 @@ struct sti_mbox_device {
> > >  	void __iomem		*base;
> > >  	const char		*name;
> > >  	u32			enabled[STI_MBOX_INST_MAX];
> > > -	spinlock_t		lock;
> > > +	raw_spinlock_t		lock;
> > >  };
> > >  
> > >  /**
> > > @@ -129,10 +129,10 @@ static void sti_mbox_enable_channel(struct
> > > mbox_chan *chan) unsigned long flags;
> > >  	void __iomem *base = MBOX_BASE(mdev, instance);
> > >  
> > > -	spin_lock_irqsave(&mdev->lock, flags);
> > > +	raw_spin_lock_irqsave(&mdev->lock, flags);
> > >  	mdev->enabled[instance] |= BIT(channel);
> > >  	writel_relaxed(BIT(channel), base + STI_ENA_SET_OFFSET);
> > > -	spin_unlock_irqrestore(&mdev->lock, flags);
> > > +	raw_spin_unlock_irqrestore(&mdev->lock, flags);
> > >  }
> > >  
> > >  static void sti_mbox_disable_channel(struct mbox_chan *chan)
> > > @@ -144,10 +144,10 @@ static void sti_mbox_disable_channel(struct
> > > mbox_chan *chan) unsigned long flags;
> > >  	void __iomem *base = MBOX_BASE(mdev, instance);
> > >  
> > > -	spin_lock_irqsave(&mdev->lock, flags);
> > > +	raw_spin_lock_irqsave(&mdev->lock, flags);
> > >  	mdev->enabled[instance] &= ~BIT(channel);
> > >  	writel_relaxed(BIT(channel), base + STI_ENA_CLR_OFFSET);
> > > -	spin_unlock_irqrestore(&mdev->lock, flags);
> > > +	raw_spin_unlock_irqrestore(&mdev->lock, flags);
> > >  }
> > >  
> > >  static void sti_mbox_clear_irq(struct mbox_chan *chan)
> > > @@ -450,7 +450,7 @@ static int sti_mbox_probe(struct platform_device
> > > *pdev) mdev->dev		= &pdev->dev;
> > >  	mdev->mbox		= mbox;
> > >  
> > > -	spin_lock_init(&mdev->lock);
> > > +	raw_spin_lock_init(&mdev->lock);
> > >  
> > >  	/* STi Mailbox does not have a Tx-Done or Tx-Ready IRQ */
> > >  	mbox->txdone_irq	= false;
> 
> Sebastian

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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