[PATCH v10 04/32] ARM: vGIC: rework gic_remove_from_queues()

[Andre Przywara <andre.przywara@arm.com>]

The function name gic_remove_from_queues() was a bit of a misnomer,
since it just removes an IRQ from the pending queue, not both queues.
Rename the function to make this more clear, also give it a pointer to
a struct pending_irq directly and rely on the VGIC VCPU lock to be
already taken, so this can be used in more places.
Replace the list removal in gic_clear_pending_irqs() with a call to
this function.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
 xen/arch/arm/gic.c        | 12 +++---------
 xen/arch/arm/vgic.c       |  2 +-
 xen/include/asm-arm/gic.h |  2 +-
 3 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index dcb1783..9dde146 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -400,18 +400,12 @@ static inline void gic_add_to_lr_pending(struct vcpu *v, struct pending_irq *n)
     list_add_tail(&n->lr_queue, &v->arch.vgic.lr_pending);
 }
 
-void gic_remove_from_queues(struct vcpu *v, unsigned int virtual_irq)
+void gic_remove_from_lr_pending(struct vcpu *v, struct pending_irq *p)
 {
-    struct pending_irq *p;
-    unsigned long flags;
-
-    spin_lock_irqsave(&v->arch.vgic.lock, flags);
-
-    p = irq_to_pending(v, virtual_irq);
+    ASSERT(spin_is_locked(&v->arch.vgic.lock));
 
     if ( !list_empty(&p->lr_queue) )
         list_del_init(&p->lr_queue);
-    spin_unlock_irqrestore(&v->arch.vgic.lock, flags);
 }
 
 void gic_raise_inflight_irq(struct vcpu *v, unsigned int virtual_irq)
@@ -612,7 +606,7 @@ void gic_clear_pending_irqs(struct vcpu *v)
 
     v->arch.lr_mask = 0;
     list_for_each_entry_safe ( p, t, &v->arch.vgic.lr_pending, lr_queue )
-        list_del_init(&p->lr_queue);
+        gic_remove_from_lr_pending(v, p);
 }
 
 int gic_events_need_delivery(void)
diff --git a/xen/arch/arm/vgic.c b/xen/arch/arm/vgic.c
index 69d732b..3993965 100644
--- a/xen/arch/arm/vgic.c
+++ b/xen/arch/arm/vgic.c
@@ -325,7 +325,7 @@ void vgic_disable_irqs(struct vcpu *v, uint32_t r, int n)
         spin_lock_irqsave(&v_target->arch.vgic.lock, flags);
         p = irq_to_pending(v_target, irq);
         clear_bit(GIC_IRQ_GUEST_ENABLED, &p->status);
-        gic_remove_from_queues(v_target, irq);
+        gic_remove_from_lr_pending(v_target, p);
         desc = p->desc;
         spin_unlock_irqrestore(&v_target->arch.vgic.lock, flags);
 
diff --git a/xen/include/asm-arm/gic.h b/xen/include/asm-arm/gic.h
index 836a103..3130634 100644
--- a/xen/include/asm-arm/gic.h
+++ b/xen/include/asm-arm/gic.h
@@ -243,7 +243,7 @@ extern void init_maintenance_interrupt(void);
 extern void gic_raise_guest_irq(struct vcpu *v, unsigned int irq,
         unsigned int priority);
 extern void gic_raise_inflight_irq(struct vcpu *v, unsigned int virtual_irq);
-extern void gic_remove_from_queues(struct vcpu *v, unsigned int virtual_irq);
+extern void gic_remove_from_lr_pending(struct vcpu *v, struct pending_irq *p);
 
 /* Accept an interrupt from the GIC and dispatch its handler */
 extern void gic_interrupt(struct cpu_user_regs *regs, int is_fiq);
-- 
2.9.0


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