iommu/irq_remapping: Normailize the way to detect whether IR is enabled

Refine code by normailizing the way to detect whether IR is enabled.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Tested-by: Joerg Roedel <joro@8bytes.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: iommu@lists.linux-foundation.org
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Link: http://lkml.kernel.org/r/1420615903-28253-17-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 14 insertions, 24 deletions

diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 5585c4e17e39..390079ee1350 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -218,7 +218,7 @@ int __init irq_remapping_enable(void)
 {
         int ret;
 
-        if (!remap_ops || !remap_ops->enable)
+        if (!remap_ops->enable)
                 return -ENODEV;
 
         ret = remap_ops->enable();
@@ -231,22 +231,16 @@ int __init irq_remapping_enable(void)
 
 void irq_remapping_disable(void)
 {
-        if (!irq_remapping_enabled ||
-            !remap_ops ||
-            !remap_ops->disable)
-                return;
-
-        remap_ops->disable();
+        if (irq_remapping_enabled && remap_ops->disable)
+                remap_ops->disable();
 }
 
 int irq_remapping_reenable(int mode)
 {
-        if (!irq_remapping_enabled ||
-            !remap_ops ||
-            !remap_ops->reenable)
-                return 0;
+        if (irq_remapping_enabled && remap_ops->reenable)
+                return remap_ops->reenable(mode);
 
-        return remap_ops->reenable(mode);
+        return 0;
 }
 
 int __init irq_remap_enable_fault_handling(void)
@@ -254,7 +248,7 @@ int __init irq_remap_enable_fault_handling(void)
         if (!irq_remapping_enabled)
                 return 0;
 
-        if (!remap_ops || !remap_ops->enable_faulting)
+        if (!remap_ops->enable_faulting)
                 return -ENODEV;
 
         return remap_ops->enable_faulting();
@@ -265,7 +259,7 @@ int setup_ioapic_remapped_entry(int irq,
                                 unsigned int destination, int vector,
                                 struct io_apic_irq_attr *attr)
 {
-        if (!remap_ops || !remap_ops->setup_ioapic_entry)
+        if (!remap_ops->setup_ioapic_entry)
                 return -ENODEV;
 
         return remap_ops->setup_ioapic_entry(irq, entry, destination,
@@ -275,8 +269,7 @@ int setup_ioapic_remapped_entry(int irq,
 static int set_remapped_irq_affinity(struct irq_data *data,
                                      const struct cpumask *mask, bool force)
 {
-        if (!config_enabled(CONFIG_SMP) || !remap_ops ||
-            !remap_ops->set_affinity)
+        if (!config_enabled(CONFIG_SMP) || !remap_ops->set_affinity)
                 return 0;
 
         return remap_ops->set_affinity(data, mask, force);
@@ -286,10 +279,7 @@ void free_remapped_irq(int irq)
 {
         struct irq_cfg *cfg = irq_cfg(irq);
 
-        if (!remap_ops || !remap_ops->free_irq)
-                return;
-
-        if (irq_remapped(cfg))
+        if (irq_remapped(cfg) && remap_ops->free_irq)
                 remap_ops->free_irq(irq);
 }
 
@@ -301,13 +291,13 @@ void compose_remapped_msi_msg(struct pci_dev *pdev,
 
         if (!irq_remapped(cfg))
                 native_compose_msi_msg(pdev, irq, dest, msg, hpet_id);
-        else if (remap_ops && remap_ops->compose_msi_msg)
+        else if (remap_ops->compose_msi_msg)
                 remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
 }
 
 static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
 {
-        if (!remap_ops || !remap_ops->msi_alloc_irq)
+        if (!remap_ops->msi_alloc_irq)
                 return -ENODEV;
 
         return remap_ops->msi_alloc_irq(pdev, irq, nvec);
@@ -316,7 +306,7 @@ static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
 static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
                                   int index, int sub_handle)
 {
-        if (!remap_ops || !remap_ops->msi_setup_irq)
+        if (!remap_ops->msi_setup_irq)
                 return -ENODEV;
 
         return remap_ops->msi_setup_irq(pdev, irq, index, sub_handle);
@@ -326,7 +316,7 @@ int setup_hpet_msi_remapped(unsigned int irq, unsigned int id)
 {
         int ret;
 
-        if (!remap_ops || !remap_ops->alloc_hpet_msi)
+        if (!remap_ops->alloc_hpet_msi)
                 return -ENODEV;
 
         ret = remap_ops->alloc_hpet_msi(irq, id);