sparseirq: fix intr-remap with dyn_array/nr_irqs changes]

In irq_2_iommu_alloc() and set_irte_irq(), irq_to_desc or
irq_2_iommu pointers may not be allocated. So use the routines
which will allocate them if they are not already allocated.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
index 23372c811159610838da7005f08828af874ae2bb..2dcf973890c46cfd96a9a4f2b7c06973c4ee399c 100644 (file)
--- a/drivers/pci/intr_remapping.c
+++ b/drivers/pci/intr_remapping.c
@@ -76,9 +76,10 @@ static struct irq_2_iommu *irq_2_iommu_alloc(unsigned int irq)
        struct irq_desc *desc;
        struct irq_2_iommu *irq_iommu;
 
-       desc = irq_to_desc(irq);
-
-       BUG_ON(!desc);
+       /*
+        * alloc irq desc if not allocated already.
+        */
+       desc = irq_to_desc_alloc(irq);
 
        irq_iommu = desc->irq_2_iommu;
 
@@ -255,11 +256,8 @@ int set_irte_irq(int irq, struct intel_iommu *iommu, u16 index, u16 subhandle)
        struct irq_2_iommu *irq_iommu;
 
        spin_lock(&irq_2_ir_lock);
-       irq_iommu = valid_irq_2_iommu(irq);
-       if (!irq_iommu) {
-               spin_unlock(&irq_2_ir_lock);
-               return -1;
-       }
+
+       irq_iommu = irq_2_iommu_alloc(irq);
 
        irq_iommu->iommu = iommu;
        irq_iommu->irte_index = index;