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-rw-r--r--arch/i386/mm/ioremap.c37
1 files changed, 29 insertions, 8 deletions
diff --git a/arch/i386/mm/ioremap.c b/arch/i386/mm/ioremap.c
index 5d09de8d1c6b..8498b5ac3955 100644
--- a/arch/i386/mm/ioremap.c
+++ b/arch/i386/mm/ioremap.c
@@ -223,9 +223,15 @@ void __iomem *ioremap_nocache (unsigned long phys_addr, unsigned long size)
}
EXPORT_SYMBOL(ioremap_nocache);
+/**
+ * iounmap - Free a IO remapping
+ * @addr: virtual address from ioremap_*
+ *
+ * Caller must ensure there is only one unmapping for the same pointer.
+ */
void iounmap(volatile void __iomem *addr)
{
- struct vm_struct *p;
+ struct vm_struct *p, *o;
if ((void __force *)addr <= high_memory)
return;
@@ -239,22 +245,37 @@ void iounmap(volatile void __iomem *addr)
addr < phys_to_virt(ISA_END_ADDRESS))
return;
- write_lock(&vmlist_lock);
- p = __remove_vm_area((void *)(PAGE_MASK & (unsigned long __force)addr));
- if (!p) {
- printk(KERN_WARNING "iounmap: bad address %p\n", addr);
+ addr = (volatile void *)(PAGE_MASK & (unsigned long __force)addr);
+
+ /* Use the vm area unlocked, assuming the caller
+ ensures there isn't another iounmap for the same address
+ in parallel. Reuse of the virtual address is prevented by
+ leaving it in the global lists until we're done with it.
+ cpa takes care of the direct mappings. */
+ read_lock(&vmlist_lock);
+ for (p = vmlist; p; p = p->next) {
+ if (p->addr == addr)
+ break;
+ }
+ read_unlock(&vmlist_lock);
+
+ if (!p) {
+ printk("iounmap: bad address %p\n", addr);
dump_stack();
- goto out_unlock;
+ return;
}
+ /* Reset the direct mapping. Can block */
if ((p->flags >> 20) && p->phys_addr < virt_to_phys(high_memory) - 1) {
change_page_attr(virt_to_page(__va(p->phys_addr)),
p->size >> PAGE_SHIFT,
PAGE_KERNEL);
global_flush_tlb();
}
-out_unlock:
- write_unlock(&vmlist_lock);
+
+ /* Finally remove it */
+ o = remove_vm_area((void *)addr);
+ BUG_ON(p != o || o == NULL);
kfree(p);
}
EXPORT_SYMBOL(iounmap);
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