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authorAlexey Kardashevskiy <aik@ozlabs.ru>2016-11-30 09:52:00 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2016-12-02 06:38:29 +0300
commitd7baee6901b34c4895eb78efdbf13a49079d7404 (patch)
tree82e581d4b82571bb48672167ebd1a94532f60ad3 /drivers/vfio
parent88f54a3581eb9deaa3bd1aade40aef266d782385 (diff)
downloadlinux-d7baee6901b34c4895eb78efdbf13a49079d7404.tar.xz
powerpc/iommu: Stop using @current in mm_iommu_xxx
This changes mm_iommu_xxx helpers to take mm_struct as a parameter instead of getting it from @current which in some situations may not have a valid reference to mm. This changes helpers to receive @mm and moves all references to @current to the caller, including checks for !current and !current->mm; checks in mm_iommu_preregistered() are removed as there is no caller yet. This moves the mm_iommu_adjust_locked_vm() call to the caller as it receives mm_iommu_table_group_mem_t but it needs mm. This should cause no behavioral change. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Acked-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/vfio_iommu_spapr_tce.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
index 80378ddadc5c..d0c38b201267 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -107,14 +107,17 @@ static long tce_iommu_unregister_pages(struct tce_container *container,
{
struct mm_iommu_table_group_mem_t *mem;
+ if (!current || !current->mm)
+ return -ESRCH; /* process exited */
+
if ((vaddr & ~PAGE_MASK) || (size & ~PAGE_MASK))
return -EINVAL;
- mem = mm_iommu_find(vaddr, size >> PAGE_SHIFT);
+ mem = mm_iommu_find(current->mm, vaddr, size >> PAGE_SHIFT);
if (!mem)
return -ENOENT;
- return mm_iommu_put(mem);
+ return mm_iommu_put(current->mm, mem);
}
static long tce_iommu_register_pages(struct tce_container *container,
@@ -124,11 +127,14 @@ static long tce_iommu_register_pages(struct tce_container *container,
struct mm_iommu_table_group_mem_t *mem = NULL;
unsigned long entries = size >> PAGE_SHIFT;
+ if (!current || !current->mm)
+ return -ESRCH; /* process exited */
+
if ((vaddr & ~PAGE_MASK) || (size & ~PAGE_MASK) ||
((vaddr + size) < vaddr))
return -EINVAL;
- ret = mm_iommu_get(vaddr, entries, &mem);
+ ret = mm_iommu_get(current->mm, vaddr, entries, &mem);
if (ret)
return ret;
@@ -375,7 +381,7 @@ static int tce_iommu_prereg_ua_to_hpa(unsigned long tce, unsigned long size,
long ret = 0;
struct mm_iommu_table_group_mem_t *mem;
- mem = mm_iommu_lookup(tce, size);
+ mem = mm_iommu_lookup(current->mm, tce, size);
if (!mem)
return -EINVAL;