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IO resources, x86: ioremap sanity check to catch mapping requests exceeding the BAR sizes

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Go through the iomem resource tree to check if any of the ioremap()
requests span more than any slot in the iomem resource tree and do
a WARN_ON() if we hit this check.

This will raise a red-flag, if some driver is mapping more than what
is needed. And hopefully identify possible corruptions much earlier.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Suresh Siddha
2008-09-25 18:43:34 -07:00
committed by Ingo Molnar
parent 9a22b6e76b
commit 379daf6290
3 changed files with 40 additions and 0 deletions
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6
arch/x86/mm/ioremap.c
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@@ -149,6 +149,12 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
if (is_ISA_range(phys_addr, last_addr))
return (__force void __iomem *)phys_to_virt(phys_addr);
/*
* Check if the request spans more than any BAR in the iomem resource
* tree.
*/
WARN_ON(iomem_map_sanity_check(phys_addr, size));
/*
* Don't allow anybody to remap normal RAM that we're using..
*/