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iommu/amd: Don't hold a reference to task_struct 

Since we are only caring about the lifetime of the mm_struct
and not the task we can't safely keep a reference to it. The
reference is also not needed anymore, so remove that code
entirely.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Tested-by: Oded Gabbay <Oded.Gabbay@amd.com>
This commit is contained in:
Joerg Roedel 2014-07-09 17:56:43 +02:00
parent f0aac63b87
commit dba3838d7a
1 changed files with 1 additions and 3 deletions
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4
drivers/iommu/amd_iommu_v2.c
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@ -47,7 +47,6 @@ struct pasid_state {
atomic_t count; /* Reference count */
unsigned mmu_notifier_count; /* Counting nested mmu_notifier
calls */
struct task_struct *task; /* Task bound to this PASID */
struct mm_struct *mm; /* mm_struct for the faults */
struct mmu_notifier mn; /* mmu_notifier handle */
struct pri_queue pri[PRI_QUEUE_SIZE]; /* PRI tag states */
@ -531,7 +530,7 @@ static void do_fault(struct work_struct *work)
write = !!(fault->flags & PPR_FAULT_WRITE);
down_read(&fault->state->mm->mmap_sem);
npages = get_user_pages(fault->state->task, fault->state->mm,
npages = get_user_pages(NULL, fault->state->mm,
fault->address, 1, write, 0, &page, NULL);
up_read(&fault->state->mm->mmap_sem);
@ -672,7 +671,6 @@ int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
spin_lock_init(&pasid_state->lock);
mm = get_task_mm(task);
pasid_state->task = task;
pasid_state->mm = mm;
pasid_state->device_state = dev_state;
pasid_state->pasid = pasid;