From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Tue, 16 Mar 2021 19:57:33 +0000 (-0400)
Subject: optee rcu fix
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=ca57e9477615597617ca4fee3e616c17505235ed;p=users%2Fjedix%2Flinux-maple.git

optee rcu fix

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 94acf379eaee..9f888fb91975 100644
--- a/drivers/tee/optee/call.c
+++ b/drivers/tee/optee/call.c
@@ -548,10 +548,12 @@ static int __check_mem_type(struct vm_area_struct *vma, unsigned long end)
 	MA_STATE(mas, &vma->vm_mm->mm_mt, vma->vm_start, vma->vm_start);
 
 
+	rcu_read_lock();
 	mas_for_each(&mas, vma, end) {
 		if (!is_normal_memory(vma->vm_page_prot))
 		    break;
 	}
+	rcu_unread_lock();
 
 	if (!vma)
 		return 0;