Showing error 952

User: Jiri Slaby
Error type: Leaving function in locked state
Error type description: Some lock is not unlocked on all paths of a function, so it is leaked
File location: mm/mremap.c
Line in file: 127
Project: Linux Kernel
Project version: 2.6.28
Tools: Stanse (1.2)
Undetermined 1
Entered: 2012-03-02 21:35:17 UTC

Source: 

 97        }
 98
 99        /*
100         * We don't have to worry about the ordering of src and dst
101         * pte locks because exclusive mmap_sem prevents deadlock.
102         */
103        old_pte = pte_offset_map_lock(mm, old_pmd, old_addr, &old_ptl);
104         new_pte = pte_offset_map_nested(new_pmd, new_addr);
105        new_ptl = pte_lockptr(mm, new_pmd);
106        if (new_ptl != old_ptl)
107                spin_lock_nested(new_ptl, SINGLE_DEPTH_NESTING);
108        arch_enter_lazy_mmu_mode();
109
110        for (; old_addr < old_end; old_pte++, old_addr += PAGE_SIZE,
111                                   new_pte++, new_addr += PAGE_SIZE) {
112                if (pte_none(*old_pte))
113                        continue;
114                pte = ptep_clear_flush(vma, old_addr, old_pte);
115                pte = move_pte(pte, new_vma->vm_page_prot, old_addr, new_addr);
116                set_pte_at(mm, new_addr, new_pte, pte);
117        }
118
119        arch_leave_lazy_mmu_mode();
120        if (new_ptl != old_ptl)
121                spin_unlock(new_ptl);
122        pte_unmap_nested(new_pte - 1);
123        pte_unmap_unlock(old_pte - 1, old_ptl);
124        if (mapping)
125                spin_unlock(&mapping->i_mmap_lock);
126        mmu_notifier_invalidate_range_end(vma->vm_mm, old_start, old_end);
127}
128
129#define LATENCY_LIMIT        (64 * PAGE_SIZE)
130
131unsigned long move_page_tables(struct vm_area_struct *vma,
132                unsigned long old_addr, struct vm_area_struct *new_vma,
133                unsigned long new_addr, unsigned long len)
134{
135        unsigned long extent, next, old_end;
136        pmd_t *old_pmd, *new_pmd;
137
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