From: Luca Fancellu luca.fancellu@arm.com
commit d120198bd5ff1d41808b6914e1eb89aff937415c upstream.
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 Reviewed-by: Julien Grall jgrall@amazon.com Reviewed-by: Wei Liu wei.liu@kernel.org Link: https://lore.kernel.org/r/20210406105105.10141-1-luca.fancellu@arm.com Signed-off-by: Boris Ostrovsky boris.ostrovsky@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/xen/events/events_base.c | 10 +++++----- drivers/xen/events/events_internal.h | 2 +- 2 files changed, 6 insertions(+), 6 deletions(-)
--- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -222,7 +222,7 @@ static int xen_irq_info_common_setup(str 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) @@ -374,28 +374,28 @@ static void do_mask(struct irq_info *inf { 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 --- a/drivers/xen/events/events_internal.h +++ b/drivers/xen/events/events_internal.h @@ -47,7 +47,7 @@ struct irq_info { unsigned short eoi_cpu; /* EOI must happen on this cpu */ 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;