tree 89fb4aae49a2fc7181aade9e1dae34b1cc145a54
parent eda80228860641b7b0e963e6bd219b960c500af9
author Andrew Morton <[EMAIL PROTECTED]> Fri, 08 Jul 2005 07:56:02 -0700
committer Linus Torvalds <[EMAIL PROTECTED]> Fri, 08 Jul 2005 08:23:35 -0700
[PATCH] iounmap debugging
We get sporadic reports of `__iounmap: bad address' coming out. Add a
dump_stack() to find the culprit.
Try to identify which subsystem is having iounmap() problems.
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
arch/i386/mm/ioremap.c | 6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/i386/mm/ioremap.c b/arch/i386/mm/ioremap.c
--- a/arch/i386/mm/ioremap.c
+++ b/arch/i386/mm/ioremap.c
@@ -228,7 +228,8 @@ EXPORT_SYMBOL(ioremap_nocache);
void iounmap(volatile void __iomem *addr)
{
struct vm_struct *p;
- if ((void __force *) addr <= high_memory)
+
+ if ((void __force *)addr <= high_memory)
return;
/*
@@ -241,9 +242,10 @@ void iounmap(volatile void __iomem *addr
return;
write_lock(&vmlist_lock);
- p = __remove_vm_area((void *) (PAGE_MASK & (unsigned long __force)
addr));
+ p = __remove_vm_area((void *)(PAGE_MASK & (unsigned long __force)addr));
if (!p) {
printk(KERN_WARNING "iounmap: bad address %p\n", addr);
+ dump_stack();
goto out_unlock;
}
-
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