[PATCH v2] parisc: Fix vmap memory leak in ioremap()/iounmap()

[Helge Deller <deller@gmx.de>]

Sven noticed that calling ioremap() and iounmap() multiple times leads
to a vmap memory leak:
	vmap allocation for size 4198400 failed:
	use vmalloc=<size> to increase size

It seems we missed calling vunmap() in ioummap().

Signed-off-by: Helge Deller <deller@gmx.de>
Noticed-by: Sven Schnelle <svens@stackframe.org>
Cc: <stable@vger.kernel.org>

diff --git a/arch/parisc/mm/ioremap.c b/arch/parisc/mm/ioremap.c
index 92a9b5f12f98..f29f682352f0 100644
--- a/arch/parisc/mm/ioremap.c
+++ b/arch/parisc/mm/ioremap.c
@@ -3,7 +3,7 @@
  * arch/parisc/mm/ioremap.c
  *
  * (C) Copyright 1995 1996 Linus Torvalds
- * (C) Copyright 2001-2006 Helge Deller <deller@gmx.de>
+ * (C) Copyright 2001-2019 Helge Deller <deller@gmx.de>
  * (C) Copyright 2005 Kyle McMartin <kyle@parisc-linux.org>
  */

@@ -84,7 +84,7 @@ void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned l
 	addr = (void __iomem *) area->addr;
 	if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size,
 			       phys_addr, pgprot)) {
-		vfree(addr);
+		vunmap(addr);
 		return NULL;
 	}

@@ -92,9 +92,11 @@ void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned l
 }
 EXPORT_SYMBOL(__ioremap);

-void iounmap(const volatile void __iomem *addr)
+void iounmap(const volatile void __iomem *io_addr)
 {
-	if (addr > high_memory)
-		return vfree((void *) (PAGE_MASK & (unsigned long __force) addr));
+	unsigned long addr = (unsigned long)io_addr & PAGE_MASK;
+
+	if (is_vmalloc_addr((void *)addr))
+		vunmap((void *)addr);
 }
 EXPORT_SYMBOL(iounmap);