From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Fri, 28 Jan 2022 17:30:06 +0000 (+0100)
Subject: m68k: mm: Remove check for VM_IO to fix deferred I/O
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c4d5b6eef2581dd893bea4edb374e480e5a90ce6;p=linux.git

m68k: mm: Remove check for VM_IO to fix deferred I/O

When an application accesses a mapped frame buffer backed by deferred
I/O, it receives a segmentation fault.  Fix this by removing the check
for VM_IO in do_page_fault().

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Link: https://lore.kernel.org/r/20220128173006.1713210-1-geert@linux-m68k.org
---

diff --git a/arch/m68k/mm/fault.c b/arch/m68k/mm/fault.c
index 1493cf5eac1e7..71aa9f6315dc8 100644
--- a/arch/m68k/mm/fault.c
+++ b/arch/m68k/mm/fault.c
@@ -93,8 +93,6 @@ retry:
 	vma = find_vma(mm, address);
 	if (!vma)
 		goto map_err;
-	if (vma->vm_flags & VM_IO)
-		goto acc_err;
 	if (vma->vm_start <= address)
 		goto good_area;
 	if (!(vma->vm_flags & VM_GROWSDOWN))