drivers/virt/fsl_hypervisor.c: use get_user_pages_unlocked()

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. Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Lorenzo Stoakes <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Paolo Bonzini <[email protected]> Cc: Kumar Gala <[email protected]> Cc: Mihai Caraman <[email protected]> Cc: Greg KH <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
kyagi · May 9, 2017 · 3d88936 · 3d88936
1 parent 6325945
commit 3d88936
Showing 1 changed file with 2 additions and 5 deletions.
diff --git 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 */