[PATCH] drivers/virt: use get_user_pages_unlocked()

[Lorenzo Stoakes]

Moving from get_user_pages() to get_user_pages_unlocked() simplifies the code
and takes advantage of VM_FAULT_RETRY functionality when faulting in pages.

Signed-off-by: Lorenzo Stoakes <lstoa...@gmail.com>
---
 drivers/virt/fsl_hypervisor.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/virt/fsl_hypervisor.c b/drivers/virt/fsl_hypervisor.c
index 150ce2a..d3eca87 100644
--- a/drivers/virt/fsl_hypervisor.c
+++ b/drivers/virt/fsl_hypervisor.c
@@ -243,11 +243,8 @@ static long ioctl_memcpy(struct fsl_hv_ioctl_memcpy __user 
*p)
        sg_list = PTR_ALIGN(sg_list_unaligned, sizeof(struct fh_sg_list));
 
        /* Get the physical addresses of the source buffer */
-       down_read(&current->mm->mmap_sem);
-       num_pinned = get_user_pages(param.local_vaddr - lb_offset,
-               num_pages, (param.source == -1) ? 0 : FOLL_WRITE,
-               pages, NULL);
-       up_read(&current->mm->mmap_sem);
+       num_pinned = get_user_pages_unlocked(param.local_vaddr - lb_offset,
+               num_pages, pages, (param.source == -1) ? 0 : FOLL_WRITE);
 
        if (num_pinned != num_pages) {
                /* get_user_pages() failed */
-- 
2.10.2