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xen/arm: Use p2m entry with lock protection 

A new local variable is introduced for accessing p2m entry with lock
protection.

Signed-off-by: Hillf Danton <hdanton@sina.com>
Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
This commit is contained in:
Hillf Danton 2019-04-30 11:26:08 -07:00 committed by Stefano Stabellini
parent 425f1cc221
commit fe846979d3
1 changed files with 2 additions and 1 deletions
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3
arch/arm/xen/p2m.c
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@ -70,8 +70,9 @@ unsigned long __pfn_to_mfn(unsigned long pfn)
entry = rb_entry(n, struct xen_p2m_entry, rbnode_phys);
if (entry->pfn <= pfn &&
entry->pfn + entry->nr_pages > pfn) {
unsigned long mfn = entry->mfn + (pfn - entry->pfn);
read_unlock_irqrestore(&p2m_lock, irqflags);
return entry->mfn + (pfn - entry->pfn);
return mfn;
}
if (pfn < entry->pfn)
n = n->rb_left;