dect
/
linux-2.6
Archived
13
0
Fork 0
Code Releases Activity

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband 

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband:
  IB/mthca: Use IRQ safe locks to protect allocation bitmaps
This commit is contained in:
Linus Torvalds 2006-08-31 21:27:29 -07:00
parent 0668b47205 5a4e6dccbc
commit b63fe1ba44
1 changed files with 11 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/infiniband/hw/mthca/mthca_allocator.c
View File

@ -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,