Merge to Fedora kernel-2.6.18-1.2224_FC5 patched with stable patch-2.6.18.1-vs2.0...

[linux-2.6.git] / drivers / infiniband / hw / mthca / mthca_allocator.c

diff --git a/drivers/infiniband/hw/mthca/mthca_allocator.c b/drivers/infiniband/hw/mthca/mthca_allocator.c
index 9ba3211..f930e55 100644 (file)
--- a/drivers/infiniband/hw/mthca/mthca_allocator.c
+++ b/drivers/infiniband/hw/mthca/mthca_allocator.c
@@ -41,9 +41,11 @@
 /* Trivial bitmap-based allocator */
 u32 mthca_alloc(struct mthca_alloc *alloc)
 {
+       unsigned long flags;
        u32 obj;
 
-       spin_lock(&alloc->lock);
+       spin_lock_irqsave(&alloc->lock, flags);
+
        obj = find_next_zero_bit(alloc->table, alloc->max, alloc->last);
        if (obj >= alloc->max) {
                alloc->top = (alloc->top + alloc->max) & alloc->mask;
@@ -56,19 +58,24 @@ u32 mthca_alloc(struct mthca_alloc *alloc)
        } else
                obj = -1;
 
-       spin_unlock(&alloc->lock);
+       spin_unlock_irqrestore(&alloc->lock, flags);
 
        return obj;
 }
 
 void mthca_free(struct mthca_alloc *alloc, u32 obj)
 {
+       unsigned long flags;
+
        obj &= alloc->max - 1;
-       spin_lock(&alloc->lock);
+
+       spin_lock_irqsave(&alloc->lock, flags);
+
        clear_bit(obj, alloc->table);
        alloc->last = min(alloc->last, obj);
        alloc->top = (alloc->top + alloc->max) & alloc->mask;
-       spin_unlock(&alloc->lock);
+
+       spin_unlock_irqrestore(&alloc->lock, flags);
 }
 
 int mthca_alloc_init(struct mthca_alloc *alloc, u32 num, u32 mask,
@@ -108,14 +115,15 @@ void mthca_alloc_cleanup(struct mthca_alloc *alloc)
  * serialize access to the array.
  */
 
+#define MTHCA_ARRAY_MASK (PAGE_SIZE / sizeof (void *) - 1)
+
 void *mthca_array_get(struct mthca_array *array, int index)
 {
        int p = (index * sizeof (void *)) >> PAGE_SHIFT;
 
-       if (array->page_list[p].page) {
-               int i = index & (PAGE_SIZE / sizeof (void *) - 1);
-               return array->page_list[p].page[i];
-       } else
+       if (array->page_list[p].page)
+               return array->page_list[p].page[index & MTHCA_ARRAY_MASK];
+       else
                return NULL;
 }
 
@@ -130,8 +138,7 @@ int mthca_array_set(struct mthca_array *array, int index, void *value)
        if (!array->page_list[p].page)
                return -ENOMEM;
 
-       array->page_list[p].page[index & (PAGE_SIZE / sizeof (void *) - 1)] =
-               value;
+       array->page_list[p].page[index & MTHCA_ARRAY_MASK] = value;
        ++array->page_list[p].used;
 
        return 0;
@@ -144,7 +151,8 @@ void mthca_array_clear(struct mthca_array *array, int index)
        if (--array->page_list[p].used == 0) {
                free_page((unsigned long) array->page_list[p].page);
                array->page_list[p].page = NULL;
-       }
+       } else
+               array->page_list[p].page[index & MTHCA_ARRAY_MASK] = NULL;
 
        if (array->page_list[p].used < 0)
                pr_debug("Array %p index %d page %d with ref count %d < 0\n",