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xtensa: fix lock_mm_and_find_vma in case VMA not found 

commit 03f889378f upstream.

MMU version of lock_mm_and_find_vma releases the mm lock before
returning when VMA is not found. Do the same in noMMU version.
This fixes hang on an attempt to handle protection fault.

Fixes: d85a143b69 ("xtensa: fix NOMMU build with lock_mm_and_find_vma() conversion")
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Max Filippov 2023-07-01 03:31:55 -07:00 committed by Greg Kroah-Hartman
parent 0f4ac6b4c5
commit 6b2849b3e0
1 changed files with 6 additions and 1 deletions
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7
mm/nommu.c
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@ -688,8 +688,13 @@ EXPORT_SYMBOL(find_vma);
struct vm_area_struct *lock_mm_and_find_vma(struct mm_struct *mm,
unsigned long addr, struct pt_regs *regs)
{
struct vm_area_struct *vma;
mmap_read_lock(mm);
return vma_lookup(mm, addr);
vma = vma_lookup(mm, addr);
if (!vma)
mmap_read_unlock(mm);
return vma;
}
/*