Unmask operation must be called with interrupt disabled, on preempt_rt spin_lock_irqsave/spin_unlock_irqrestore don't disable/enable interrupts, so use raw_* implementation and change lock variable in struct irq_info from spinlock_t to raw_spinlock_t

Cc: stable@vger.kernel.org Fixes: 25da4618af24 ("xen/events: don't unmask an event channel when an eoi is pending")

Signed-off-by: Luca Fancellu luca.fancellu@arm.com --- drivers/xen/events/events_base.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index 8236e2364eeb..7bbfd58958bc 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -110,7 +110,7 @@ struct irq_info { unsigned short eoi_cpu; /* EOI must happen on this cpu-1 */ unsigned int irq_epoch; /* If eoi_cpu valid: irq_epoch of event */ u64 eoi_time; /* Time in jiffies when to EOI. */ - spinlock_t lock; + raw_spinlock_t lock;

union { unsigned short virq; @@ -312,7 +312,7 @@ static int xen_irq_info_common_setup(struct irq_info *info, info->evtchn = evtchn; info->cpu = cpu; info->mask_reason = EVT_MASK_REASON_EXPLICIT; - spin_lock_init(&info->lock); + raw_spin_lock_init(&info->lock);

ret = set_evtchn_to_irq(evtchn, irq); if (ret < 0) @@ -472,28 +472,28 @@ static void do_mask(struct irq_info *info, u8 reason) { unsigned long flags;

- spin_lock_irqsave(&info->lock, flags); + raw_spin_lock_irqsave(&info->lock, flags);

if (!info->mask_reason) mask_evtchn(info->evtchn);

info->mask_reason |= reason;

- spin_unlock_irqrestore(&info->lock, flags); + raw_spin_unlock_irqrestore(&info->lock, flags); }

static void do_unmask(struct irq_info *info, u8 reason) { unsigned long flags;

- spin_lock_irqsave(&info->lock, flags); + raw_spin_lock_irqsave(&info->lock, flags);

info->mask_reason &= ~reason;

if (!info->mask_reason) unmask_evtchn(info->evtchn);

- spin_unlock_irqrestore(&info->lock, flags); + raw_spin_unlock_irqrestore(&info->lock, flags); }

#ifdef CONFIG_X86