iommu/amd: Take mmap_sem when calling get_user_pages
get_user_pages requires caller to hold a read lock on mmap_sem. Signed-off-by: Jay Cornwall <jay.cornwall@amd.com> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>
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@ -504,8 +504,10 @@ static void do_fault(struct work_struct *work)
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write = !!(fault->flags & PPR_FAULT_WRITE);
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down_read(&fault->state->mm->mmap_sem);
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npages = get_user_pages(fault->state->task, fault->state->mm,
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fault->address, 1, write, 0, &page, NULL);
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up_read(&fault->state->mm->mmap_sem);
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if (npages == 1) {
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put_page(page);
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