From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: optee: remove vma linked list walk

Use the VMA iterator instead.  Change the calling convention of
__check_mem_type() to pass in the mm instead of the first vma in the
range.

Link: https://lkml.kernel.org/r/20220426150616.3937571-40-Liam.Howlett@oracle.com
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/tee/optee/call.c |   18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

--- a/drivers/tee/optee/call.c~optee-remove-vma-linked-list-walk
+++ a/drivers/tee/optee/call.c
@@ -342,15 +342,18 @@ static bool is_normal_memory(pgprot_t p)
 #endif
 }
 
-static int __check_mem_type(struct vm_area_struct *vma, unsigned long end)
+static int __check_mem_type(struct mm_struct *mm, unsigned long start,
+				unsigned long end)
 {
-	while (vma && is_normal_memory(vma->vm_page_prot)) {
-		if (vma->vm_end >= end)
-			return 0;
-		vma = vma->vm_next;
+	struct vm_area_struct *vma;
+	VMA_ITERATOR(vmi, mm, start);
+
+	for_each_vma_range(vmi, vma, end) {
+		if (!is_normal_memory(vma->vm_page_prot))
+			return -EINVAL;
 	}
 
-	return -EINVAL;
+	return 0;
 }
 
 int optee_check_mem_type(unsigned long start, size_t num_pages)
@@ -366,8 +369,7 @@ int optee_check_mem_type(unsigned long s
 		return 0;
 
 	mmap_read_lock(mm);
-	rc = __check_mem_type(find_vma(mm, start),
-			      start + num_pages * PAGE_SIZE);
+	rc = __check_mem_type(mm, start, start + num_pages * PAGE_SIZE);
 	mmap_read_unlock(mm);
 
 	return rc;
_