On Wed, 22 Mar 2017 16:18:43 +0100
Lionel Debieve <lionel.debieve@xxxxxx> 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@xxxxxx>
Looks fine to me. Should this go to mainline?
Acked-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
-- Steve
> ---
> 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;
--
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