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 <[email protected]> Tested-by: Michael Schmitz <[email protected]> Link: https://lore.kernel.org/r/[email protected]
LoveHeat · Feb 21, 2022 · c4d5b6e · c4d5b6e
1 parent 91d7b75
commit c4d5b6e
Showing 1 changed file with 0 additions and 2 deletions.
diff --git a/arch/m68k/mm/fault.c b/arch/m68k/mm/fault.c
@@ -93,8 +93,6 @@ int do_page_fault(struct pt_regs *regs, unsigned long address,
 	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))