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2023-12-11 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4

 kernel/arch/arm/xen/p2m.c
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@@ -1,4 +1,5 @@
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-#include <linux/bootmem.h>
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+// SPDX-License-Identifier: GPL-2.0-only
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+#include <linux/memblock.h>
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 #include <linux/gfp.h>
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 #include <linux/export.h>
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 #include <linux/spinlock.h>
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@@ -61,17 +62,19 @@
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62
 
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 unsigned long __pfn_to_mfn(unsigned long pfn)
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 {
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-	struct rb_node *n = phys_to_mach.rb_node;
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+	struct rb_node *n;
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 	struct xen_p2m_entry *entry;
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 	unsigned long irqflags;
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 	read_lock_irqsave(&p2m_lock, irqflags);
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+	n = phys_to_mach.rb_node;
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 	while (n) {
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 		entry = rb_entry(n, struct xen_p2m_entry, rbnode_phys);
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 		if (entry->pfn <= pfn &&
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 				entry->pfn + entry->nr_pages > pfn) {
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+			unsigned long mfn = entry->mfn + (pfn - entry->pfn);
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 			read_unlock_irqrestore(&p2m_lock, irqflags);
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-			return entry->mfn + (pfn - entry->pfn);
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+			return mfn;
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 		}
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 		if (pfn < entry->pfn)
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 			n = n->rb_left;
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@@ -151,10 +154,11 @@
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 	int rc;
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 	unsigned long irqflags;
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 	struct xen_p2m_entry *p2m_entry;
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-	struct rb_node *n = phys_to_mach.rb_node;
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+	struct rb_node *n;
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 	if (mfn == INVALID_P2M_ENTRY) {
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 		write_lock_irqsave(&p2m_lock, irqflags);
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+		n = phys_to_mach.rb_node;
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 		while (n) {
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 			p2m_entry = rb_entry(n, struct xen_p2m_entry, rbnode_phys);
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 			if (p2m_entry->pfn <= pfn &&
..
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@@ -185,6 +189,7 @@
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 	rc = xen_add_phys_to_mach_entry(p2m_entry);
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 	if (rc < 0) {
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 		write_unlock_irqrestore(&p2m_lock, irqflags);
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+		kfree(p2m_entry);
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 		return false;
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 	}
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 	write_unlock_irqrestore(&p2m_lock, irqflags);