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authorJoerg Roedel <joerg.roedel@amd.com>2009-12-21 15:51:23 +0100
committerJoerg Roedel <joerg.roedel@amd.com>2009-12-21 15:51:23 +0100
commit0f764806438d5576ac58898332e5dcf30bb8a679 (patch)
tree145941130f4714e845e5932085ff76aa45c42dd7 /arch/x86
parent55639353a0035052d9ea6cfe4dde0ac7fcbb2c9f (diff)
downloadop-kernel-dev-0f764806438d5576ac58898332e5dcf30bb8a679.zip
op-kernel-dev-0f764806438d5576ac58898332e5dcf30bb8a679.tar.gz
x86/amd-iommu: Fix initialization failure panic
The assumption that acpi_table_parse passes the return value of the hanlder function to the caller proved wrong recently. The return value of the handler function is totally ignored. This makes the initialization code for AMD IOMMU buggy in a way that could cause a kernel panic on initialization. This patch fixes the issue in the AMD IOMMU driver. Cc: stable@kernel.org Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kernel/amd_iommu_init.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 1dca9c3..fb490ce 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -138,6 +138,11 @@ int amd_iommus_present;
bool amd_iommu_np_cache __read_mostly;
/*
+ * Set to true if ACPI table parsing and hardware intialization went properly
+ */
+static bool amd_iommu_initialized;
+
+/*
* List of protection domains - used during resume
*/
LIST_HEAD(amd_iommu_pd_list);
@@ -929,6 +934,8 @@ static int __init init_iommu_all(struct acpi_table_header *table)
}
WARN_ON(p != end);
+ amd_iommu_initialized = true;
+
return 0;
}
@@ -1263,6 +1270,9 @@ static int __init amd_iommu_init(void)
if (acpi_table_parse("IVRS", init_iommu_all) != 0)
goto free;
+ if (!amd_iommu_initialized)
+ goto free;
+
if (acpi_table_parse("IVRS", init_memory_definitions) != 0)
goto free;
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