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Subject[patch 19/21] AMD IOMMU: allocate rlookup_table with __GFP_ZERO
2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Joerg Roedel <joerg.roedel@amd.com>

Upstream commit 83fd5cc6481c6b7fa8b45f8a7e0aa7120213430b

This is pointer list and if we dereference an uninitialized pointer
later this results in a kernel crash at boot. Happens typically after
3-5 hours of rebooting.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
arch/x86/kernel/amd_iommu_init.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -930,7 +930,8 @@ int __init amd_iommu_init(void)
goto free;

/* IOMMU rlookup table - find the IOMMU for a specific device */
- amd_iommu_rlookup_table = (void *)__get_free_pages(GFP_KERNEL,
+ amd_iommu_rlookup_table = (void *)__get_free_pages(
+ GFP_KERNEL | __GFP_ZERO,
get_order(rlookup_table_size));
if (amd_iommu_rlookup_table == NULL)
goto free;


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