4 files changed, 8 insertions, 95 deletions

diff --git a/arch/i386/pci/irq.c b/arch/i386/pci/irq.c
index 4a8995c9c762..960f364cab6b 100644
--- a/arch/i386/pci/irq.c
+++ b/arch/i386/pci/irq.c
@@ -1169,33 +1169,3 @@ static int pirq_enable_irq(struct pci_dev *dev)
         }
         return 0;
 }
-
-int pci_vector_resources(int last, int nr_released)
-{
-        int count = nr_released;
-
-        int next = last;
-        int offset = (last % 8);
-
-        while (next < FIRST_SYSTEM_VECTOR) {
-                next += 8;
-#ifdef CONFIG_X86_64
-                if (next == IA32_SYSCALL_VECTOR)
-                        continue;
-#else
-                if (next == SYSCALL_VECTOR)
-                        continue;
-#endif
-                count++;
-                if (next >= FIRST_SYSTEM_VECTOR) {
-                        if (offset%8) {
-                                next = FIRST_DEVICE_VECTOR + offset;
-                                offset++;
-                                continue;
-                        }
-                        count--;
-                }
-        }
-
-        return count;
-}
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index 15c7c670da39..b30be7c48ba8 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -810,12 +810,3 @@ pcibios_prep_mwi (struct pci_dev *dev)
         }
         return rc;
 }
-
-int pci_vector_resources(int last, int nr_released)
-{
-        int count = nr_released;
-
-        count += (IA64_LAST_DEVICE_VECTOR - last);
-
-        return count;
-}
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 6d9de026e141..a32e75a4417e 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -29,8 +29,6 @@ static kmem_cache_t* msi_cachep;
 static int pci_msi_enable = 1;
 static int last_alloc_vector;
 static int nr_released_vectors;
-static int nr_reserved_vectors = NR_HP_RESERVED_VECTORS;
-static int nr_msix_devices;
 
 #ifndef CONFIG_X86_IO_APIC
 int vector_irq[NR_VECTORS] = { [0 ... NR_VECTORS - 1] = -1};
@@ -534,11 +532,6 @@ void pci_scan_msi_device(struct pci_dev *dev)
 {
         if (!dev)
                 return;
-
-        if (pci_find_capability(dev, PCI_CAP_ID_MSIX) > 0)
-                nr_msix_devices++;
-        else if (pci_find_capability(dev, PCI_CAP_ID_MSI) > 0)
-                nr_reserved_vectors++;
 }
 
 #ifdef CONFIG_PM
@@ -869,13 +862,19 @@ static int msix_capability_init(struct pci_dev *dev,
                 attach_msi_entry(entry, vector);
         }
         if (i != nvec) {
+                int avail = i - 1;
                 i--;
                 for (; i >= 0; i--) {
                         vector = (entries + i)->vector;
                         msi_free_vector(dev, vector, 0);
                         (entries + i)->vector = 0;
                 }
-                return -EBUSY;
+                /* If we had some success report the number of irqs
+                 * we succeeded in setting up.
+                 */
+                if (avail <= 0)
+                        avail = -EBUSY;
+                return avail;
         }
         /* Set MSI-X enabled bits */
         enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
@@ -954,14 +953,6 @@ int pci_enable_msi(struct pci_dev* dev)
                         return -EINVAL;
         }
         status = msi_capability_init(dev);
-        if (!status) {
-                if (!pos)
-                        nr_reserved_vectors--;  /* Only MSI capable */
-                else if (nr_msix_devices > 0)
-                        nr_msix_devices--;      /* Both MSI and MSI-X capable,
-                                                   but choose enabling MSI */
-        }
-
         return status;
 }
 
@@ -1070,10 +1061,9 @@ static int msi_free_vector(struct pci_dev* dev, int vector, int reassign)
  **/
 int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
 {
-        int status, pos, nr_entries, free_vectors;
+        int status, pos, nr_entries;
         int i, j, temp;
         u16 control;
-        unsigned long flags;
 
         if (!entries || pci_msi_supported(dev) < 0)
                 return -EINVAL;
@@ -1112,34 +1102,7 @@ int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
                 dev->irq = temp;
                 return -EINVAL;
         }
-
-        spin_lock_irqsave(&msi_lock, flags);
-        /*
-         * msi_lock is provided to ensure that enough vectors resources are
-         * available before granting.
-         */
-        free_vectors = pci_vector_resources(last_alloc_vector,
-                                nr_released_vectors);
-        /* Ensure that each MSI/MSI-X device has one vector reserved by
-           default to avoid any MSI-X driver to take all available
-           resources */
-        free_vectors -= nr_reserved_vectors;
-        /* Find the average of free vectors among MSI-X devices */
-        if (nr_msix_devices > 0)
-                free_vectors /= nr_msix_devices;
-        spin_unlock_irqrestore(&msi_lock, flags);
-
-        if (nvec > free_vectors) {
-                if (free_vectors > 0)
-                        return free_vectors;
-                else
-                        return -EBUSY;
-        }
-
         status = msix_capability_init(dev, entries, nvec);
-        if (!status && nr_msix_devices > 0)
-                nr_msix_devices--;
-
         return status;
 }
 
diff --git a/drivers/pci/msi.h b/drivers/pci/msi.h
index 3519eca50d8a..6793241f3884 100644
--- a/drivers/pci/msi.h
+++ b/drivers/pci/msi.h
@@ -8,19 +8,8 @@
 
 #include <asm/msi.h>
 
-/*
- * Assume the maximum number of hot plug slots supported by the system is about
- * ten. The worstcase is that each of these slots is hot-added with a device,
- * which has two MSI/MSI-X capable functions. To avoid any MSI-X driver, which
- * attempts to request all available vectors, NR_HP_RESERVED_VECTORS is defined
- * as below to ensure at least one message is assigned to each detected MSI/
- * MSI-X device function.
- */
-#define NR_HP_RESERVED_VECTORS  20
-
 extern int vector_irq[NR_VECTORS];
 extern void (*interrupt[NR_IRQS])(void);
-extern int pci_vector_resources(int last, int nr_released);
 
 /*
  * MSI-X Address Register