[PATCH 3/4] iommu/amd: Cleanup error handling in do_fault()

Joerg Roedel
2015-11-10T13:27:19Z

From: Joerg Roedel <jroedel@suse.de>

Get rid of the three error paths that look the same and move
error handling to a single place.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
drivers/iommu/amd_iommu_v2.c | 24 ++++++++----------------
1 file changed, 8 insertions(+), 16 deletions(-)

diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c
index afa8f9c..cd1a222 100644
--- a/drivers/iommu/amd_iommu_v2.c
+++ b/drivers/iommu/amd_iommu_v2.c
@@ -514,10 +514,10 @@ static void do_fault(struct work_struct *work)
{
struct fault *fault = container_of(work, struct fault, work);
struct vm_area_struct *vma;
+ int ret = VM_FAULT_ERROR;
unsigned int flags = 0;
struct mm_struct *mm;
u64 address;
- int ret;

mm = fault->state->mm;
address = fault->address;
@@ -529,31 +529,23 @@ static void do_fault(struct work_struct *work)

down_read(&mm->mmap_sem);
vma = find_extend_vma(mm, address);
- if (!vma || address < vma->vm_start) {
+ if (!vma || address < vma->vm_start)
/* failed to get a vma in the right range */
- up_read(&mm->mmap_sem);
- handle_fault_error(fault);
goto out;
- }

/* Check if we have the right permissions on the vma */
- if (access_error(vma, fault)) {
- up_read(&mm->mmap_sem);
- handle_fault_error(fault);
+ if (access_error(vma, fault))
goto out;
- }

ret = handle_mm_fault(mm, vma, address, flags);
- if (ret & VM_FAULT_ERROR) {
- /* failed to service fault */
- up_read(&mm->mmap_sem);
- handle_fault_error(fault);
- goto out;
- }

+out:
up_read(&mm->mmap_sem);

-out:
+ if (ret & VM_FAULT_ERROR)
+ /* failed to service fault */
+ handle_fault_error(fault);
+
finish_pri_tag(fault->dev_state, fault->state, fault->tag);

put_pasid_state(fault->state);
--
1.9.1