From: Kirill A. Shutemov Date: Tue, 8 Sep 2015 21:59:45 +0000 (-0700) Subject: mm, dax: use i_mmap_unlock_write() in do_cow_fault() X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=52a2b53ffde6d6018dfc454fbde34383351fb896;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git mm, dax: use i_mmap_unlock_write() in do_cow_fault() __dax_fault() takes i_mmap_lock for write. Let's pair it with write unlock on do_cow_fault() side. Signed-off-by: Kirill A. Shutemov Acked-by: Matthew Wilcox Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/memory.c b/mm/memory.c index ce8e983f3c4d..6cd0b2160401 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3013,9 +3013,9 @@ static int do_cow_fault(struct mm_struct *mm, struct vm_area_struct *vma, } else { /* * The fault handler has no page to lock, so it holds - * i_mmap_lock for read to protect against truncate. + * i_mmap_lock for write to protect against truncate. */ - i_mmap_unlock_read(vma->vm_file->f_mapping); + i_mmap_unlock_write(vma->vm_file->f_mapping); } goto uncharge_out; } @@ -3029,9 +3029,9 @@ static int do_cow_fault(struct mm_struct *mm, struct vm_area_struct *vma, } else { /* * The fault handler has no page to lock, so it holds - * i_mmap_lock for read to protect against truncate. + * i_mmap_lock for write to protect against truncate. */ - i_mmap_unlock_read(vma->vm_file->f_mapping); + i_mmap_unlock_write(vma->vm_file->f_mapping); } return ret; uncharge_out: