diff options
| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2018-03-22 16:22:34 +0100 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2018-03-29 10:38:14 +0200 |
| commit | 779da73273fc4c4c6f41579a95e4fb7880a1720e (patch) | |
| tree | 522d6bfd4cf79310c320293ba6b13375515926f4 /drivers/iommu/amd_iommu_types.h | |
| parent | 39ffe39545cd5cb5b8cee9f0469165cf24dc62c2 (diff) | |
iommu/amd: Turn dev_data_list into a lock less list
alloc_dev_data() adds new items to dev_data_list and search_dev_data()
is searching for items in this list. Both protect the access to the list
with a spinlock.
There is no need to navigate forth and back within the list and there is
also no deleting of a specific item. This qualifies the list to become a
lock less list and as part of this, the spinlock can be removed.
With this change the ordering of those items within the list is changed:
before the change new items were added to the end of the list, now they
are added to the front. I don't think it matters but wanted to mention
it.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/amd_iommu_types.h')
| -rw-r--r-- | drivers/iommu/amd_iommu_types.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h index da886b0095aa..1c9b080276c9 100644 --- a/drivers/iommu/amd_iommu_types.h +++ b/drivers/iommu/amd_iommu_types.h @@ -627,7 +627,7 @@ struct devid_map { */ struct iommu_dev_data { struct list_head list; /* For domain->dev_list */ - struct list_head dev_data_list; /* For global dev_data_list */ + struct llist_node dev_data_list; /* For global dev_data_list */ struct protection_domain *domain; /* Domain the device is bound to */ u16 devid; /* PCI Device ID */ u16 alias; /* Alias Device ID */ |