Showing error 1015

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: arch/x86/mm/pageattr.c
Line in file: 534
Project: Linux Kernel
Project version: 2.6.28
Tools: Undetermined 1
Entered: 2012-03-04 17:07:06 UTC

Source: 

 504#ifdef CONFIG_X86_64
 505        if (address >= (unsigned long)__va(1UL<<32) &&
 506                address < (unsigned long)__va(max_pfn_mapped << PAGE_SHIFT))
 507                split_page_count(level);
 508#endif
 509
 510        /*
 511         * Install the new, split up pagetable. Important details here:
 512         *
 513         * On Intel the NX bit of all levels must be cleared to make a
 514         * page executable. See section 4.13.2 of Intel 64 and IA-32
 515         * Architectures Software Developer's Manual).
 516         *
 517         * Mark the entry present. The current mapping might be
 518         * set to not present, which we preserved above.
 519         */
 520        ref_prot = pte_pgprot(pte_mkexec(pte_clrhuge(*kpte)));
 521        pgprot_val(ref_prot) |= _PAGE_PRESENT;
 522        __set_pmd_pte(kpte, address, mk_pte(base, ref_prot));
 523        base = NULL;
 524
 525out_unlock:
 526        /*
 527         * If we dropped out via the lookup_address check under
 528         * pgd_lock then stick the page back into the pool:
 529         */
 530        if (base)
 531                __free_page(base);
 532        spin_unlock_irqrestore(&pgd_lock, flags);
 533
 534        return 0;
 535}
 536
 537static int __change_page_attr(struct cpa_data *cpa, int primary)
 538{
 539        unsigned long address;
 540        int do_split, err;
 541        unsigned int level;
 542        pte_t *kpte, old_pte;
 543
 544        if (cpa->flags & CPA_ARRAY)
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