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

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Date:   Wed, 22 Mar 2017 16:18:43 +0100
From:   Lionel Debieve <lionel.debieve@...com>
To:     <linux-rt-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <bigeasy@...utronix.de>, <tglx@...utronix.de>,
        <rostedt@...dmis.org>, Lionel Debieve <lionel.debieve@...com>
Subject: [PATCH RT 1/1] remoteproc: Prevent schedule while atomic

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>
---
 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;
-- 
2.7.4