[PATCH v13 06/22] vfio iommu type1: Update arguments of vfio_lock_acct

From: Kirti Wankhede
Date: Tue Nov 15 2016 - 10:36:20 EST


Added task structure as input argument to vfio_lock_acct() function.

Signed-off-by: Kirti Wankhede <kwankhede@xxxxxxxxxx>
Signed-off-by: Neo Jia <cjia@xxxxxxxxxx>
Change-Id: I5d3673cc9d3786bb436b395d5f74537f1a36da80
---
drivers/vfio/vfio_iommu_type1.c | 30 ++++++++++++++++--------------
1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 9f3d58d3dfaf..34d17e51dc97 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -150,17 +150,22 @@ static void vfio_lock_acct_bg(struct work_struct *work)
kfree(vwork);
}

-static void vfio_lock_acct(long npage)
+static void vfio_lock_acct(struct task_struct *task, long npage)
{
struct vwork *vwork;
struct mm_struct *mm;

- if (!current->mm || !npage)
+ if (!npage)
+ return;
+
+ mm = get_task_mm(task);
+ if (!mm)
return; /* process exited or nothing to do */

- if (down_write_trylock(&current->mm->mmap_sem)) {
- current->mm->locked_vm += npage;
- up_write(&current->mm->mmap_sem);
+ if (down_write_trylock(&mm->mmap_sem)) {
+ mm->locked_vm += npage;
+ up_write(&mm->mmap_sem);
+ mmput(mm);
return;
}

@@ -170,11 +175,8 @@ static void vfio_lock_acct(long npage)
* wouldn't need this silliness
*/
vwork = kmalloc(sizeof(struct vwork), GFP_KERNEL);
- if (!vwork)
- return;
- mm = get_task_mm(current);
- if (!mm) {
- kfree(vwork);
+ if (!vwork) {
+ mmput(mm);
return;
}
INIT_WORK(&vwork->work, vfio_lock_acct_bg);
@@ -285,7 +287,7 @@ static long vfio_pin_pages_remote(unsigned long vaddr, long npage,

if (unlikely(disable_hugepages)) {
if (!rsvd)
- vfio_lock_acct(1);
+ vfio_lock_acct(current, 1);
return 1;
}

@@ -313,7 +315,7 @@ static long vfio_pin_pages_remote(unsigned long vaddr, long npage,
}

if (!rsvd)
- vfio_lock_acct(i);
+ vfio_lock_acct(current, i);

return i;
}
@@ -328,7 +330,7 @@ static long vfio_unpin_pages_remote(unsigned long pfn, long npage,
unlocked += put_pfn(pfn++, prot);

if (do_accounting)
- vfio_lock_acct(-unlocked);
+ vfio_lock_acct(current, -unlocked);

return unlocked;
}
@@ -390,7 +392,7 @@ static void vfio_unmap_unpin(struct vfio_iommu *iommu, struct vfio_dma *dma)
cond_resched();
}

- vfio_lock_acct(-unlocked);
+ vfio_lock_acct(current, -unlocked);
}

static void vfio_remove_dma(struct vfio_iommu *iommu, struct vfio_dma *dma)
--
2.7.0