[PATCH] PCI: clean up msi.c a bit

Clean up: move assignments outside of if() statements.
AFAICT, no functional change. Easier to read/understand.

Depends on "[PATCH 1/3] msi vector targeting abstractions"
by Mark Maule <maule@sgi.com>.
I expect one hunk to fail if applied against 2.6.15.

This is essentially Joe Perches' patch.
I've cleaned up the one instance added by Mark's patch.

Signed-off-by: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 35 insertions, 20 deletions

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 48723d6fa60f..d5a67c1bcb98 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -103,9 +103,9 @@ static void set_msi_affinity(unsigned int vector, cpumask_t cpu_mask)
         switch (entry->msi_attrib.type) {
         case PCI_CAP_ID_MSI:
         {
-                int pos;
+                int pos = pci_find_capability(entry->dev, PCI_CAP_ID_MSI);
 
-                if (!(pos = pci_find_capability(entry->dev, PCI_CAP_ID_MSI)))
+                if (!pos)
                         return;
 
                 pci_read_config_dword(entry->dev, msi_lower_address_reg(pos),
@@ -347,9 +347,9 @@ static int assign_msi_vector(void)
 
 static int get_new_vector(void)
 {
-        int vector;
+        int vector = assign_msi_vector();
 
-        if ((vector = assign_msi_vector()) > 0)
+        if (vector > 0)
                 set_intr_gate(vector, interrupt[vector]);
 
         return vector;
@@ -369,7 +369,8 @@ static int msi_init(void)
                 return status;
         }
 
-        if ((status = msi_cache_init()) < 0) {
+        status = msi_cache_init();
+        if (status < 0) {
                 pci_msi_enable = 0;
                 printk(KERN_WARNING "PCI: MSI cache init failed\n");
                 return status;
@@ -523,10 +524,12 @@ static int msi_capability_init(struct pci_dev *dev)
         pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
         pci_read_config_word(dev, msi_control_reg(pos), &control);
         /* MSI Entry Initialization */
-        if (!(entry = alloc_msi_entry()))
+        entry = alloc_msi_entry();
+        if (!entry)
                 return -ENOMEM;
 
-        if ((vector = get_msi_vector(dev)) < 0) {
+        vector = get_msi_vector(dev);
+        if (vector < 0) {
                 kmem_cache_free(msi_cachep, entry);
                 return -EBUSY;
         }
@@ -620,7 +623,8 @@ static int msix_capability_init(struct pci_dev *dev,
                 entry = alloc_msi_entry();
                 if (!entry)
                         break;
-                if ((vector = get_msi_vector(dev)) < 0)
+                vector = get_msi_vector(dev);
+                if (vector < 0)
                         break;
 
                 j = entries[i].entry;
@@ -701,10 +705,12 @@ int pci_enable_msi(struct pci_dev* dev)
 
         temp = dev->irq;
 
-        if ((status = msi_init()) < 0)
+        status = msi_init();
+        if (status < 0)
                 return status;
 
-        if (!(pos = pci_find_capability(dev, PCI_CAP_ID_MSI)))
+        pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
+        if (!pos)
                 return -EINVAL;
 
         pci_read_config_word(dev, msi_control_reg(pos), &control);
@@ -728,8 +734,8 @@ int pci_enable_msi(struct pci_dev* dev)
                 dev->irq = temp;
         }
         /* Check whether driver already requested for MSI-X vectors */
-        if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSIX)) > 0 &&
-                !msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) {
+        pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
+        if (pos > 0 && !msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) {
                         printk(KERN_INFO "PCI: %s: Can't enable MSI.  "
                                "Device already has MSI-X vectors assigned\n",
                                pci_name(dev));
@@ -755,7 +761,10 @@ void pci_disable_msi(struct pci_dev* dev)
         u16 control;
         unsigned long flags;
 
-        if (!dev || !(pos = pci_find_capability(dev, PCI_CAP_ID_MSI)))
+        if (!dev)
+                return;
+        pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
+        if (!pos)
                 return;
 
         pci_read_config_word(dev, msi_control_reg(pos), &control);
@@ -924,10 +933,12 @@ int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
         if (!pci_msi_enable || !dev || !entries)
                 return -EINVAL;
 
-        if ((status = msi_init()) < 0)
+        status = msi_init();
+        if (status < 0)
                 return status;
 
-        if (!(pos = pci_find_capability(dev, PCI_CAP_ID_MSIX)))
+        pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
+        if (!pos)
                 return -EINVAL;
 
         pci_read_config_word(dev, msi_control_reg(pos), &control);
@@ -1006,7 +1017,11 @@ void pci_disable_msix(struct pci_dev* dev)
         int pos, temp;
         u16 control;
 
-        if (!dev || !(pos = pci_find_capability(dev, PCI_CAP_ID_MSIX)))
+        if (!dev)
+                return;
+
+        pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
+        if (!pos)
                 return;
 
         pci_read_config_word(dev, msi_control_reg(pos), &control);
@@ -1066,8 +1081,8 @@ void msi_remove_pci_irq_vectors(struct pci_dev* dev)
                 return;
 
         temp = dev->irq;                /* Save IOAPIC IRQ */
-        if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) > 0 &&
-                !msi_lookup_vector(dev, PCI_CAP_ID_MSI)) {
+        pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
+        if (pos > 0 && !msi_lookup_vector(dev, PCI_CAP_ID_MSI)) {
                 spin_lock_irqsave(&msi_lock, flags);
                 state = msi_desc[dev->irq]->msi_attrib.state;
                 spin_unlock_irqrestore(&msi_lock, flags);
@@ -1080,8 +1095,8 @@ void msi_remove_pci_irq_vectors(struct pci_dev* dev)
                         msi_free_vector(dev, dev->irq, 0);
                 dev->irq = temp;                /* Restore IOAPIC IRQ */
         }
-        if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSIX)) > 0 &&
-                !msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) {
+        pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
+        if (pos > 0 && !msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) {
                 int vector, head, tail = 0, warning = 0;
                 void __iomem *base = NULL;