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iommu/amd: Don't initialize IOMMUv2 resources when not required 

Add a check to the init-path of the AMD IOMMUv2 driver if
the hardware is available in the system. Only allocate all
the resources if it is really available.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2012-03-15 12:46:40 +01:00
parent 525b233c71
commit 474d567db3
1 changed files with 13 additions and 1 deletions
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14
drivers/iommu/amd_iommu_v2.c
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@ -921,7 +921,16 @@ static int __init amd_iommu_v2_init(void)
size_t state_table_size;
int ret;
pr_info("AMD IOMMUv2 driver by Joerg Roedel <joerg.roedel@amd.com>");
pr_info("AMD IOMMUv2 driver by Joerg Roedel <joerg.roedel@amd.com>\n");
if (!amd_iommu_v2_supported()) {
pr_info("AMD IOMMUv2 functionality not available on this sytem\n");
/*
* Load anyway to provide the symbols to other modules
* which may use AMD IOMMUv2 optionally.
*/
return 0;
}
spin_lock_init(&state_lock);
@ -961,6 +970,9 @@ static void __exit amd_iommu_v2_exit(void)
size_t state_table_size;
int i;
if (!amd_iommu_v2_supported())
return;
profile_event_unregister(PROFILE_TASK_EXIT, &profile_nb);
amd_iommu_unregister_ppr_notifier(&ppr_nb);