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Commit c23a4e96 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds
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[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: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent eda80228

arch/i386/mm/ioremap.c

+4 −2
Original line number Original line Diff line number Diff line
@@ -228,6 +228,7 @@ EXPORT_SYMBOL(ioremap_nocache); 
void iounmap(volatile void __iomem *addr)

void iounmap(volatile void __iomem *addr)

{

{

	struct vm_struct *p;

	struct vm_struct *p;



	if ((void __force *)addr <= high_memory)

	if ((void __force *)addr <= high_memory)

		return;

		return;
@@ -244,6 +245,7 @@ void iounmap(volatile void __iomem *addr) 
	p = __remove_vm_area((void *)(PAGE_MASK & (unsigned long __force)addr));

	p = __remove_vm_area((void *)(PAGE_MASK & (unsigned long __force)addr));

	if (!p) { 

	if (!p) { 

		printk(KERN_WARNING "iounmap: bad address %p\n", addr);

		printk(KERN_WARNING "iounmap: bad address %p\n", addr);

		dump_stack();

		goto out_unlock;

		goto out_unlock;

	}

	}