From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Mon, 4 Jan 2021 19:43:36 +0000 (-0500)
Subject: optee: Remove vma linked list walk
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=ee1e7556761d0c1b7d69f1cec6336b1c4d5d3e25;p=users%2Fjedix%2Flinux-maple.git

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.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---

diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c
index b25cc1fac9453..177575c445de9 100644
--- a/drivers/tee/optee/call.c
+++ b/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 start, size_t num_pages)
 		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;