x86: ioremap fix failing nesting check

Mika Kukkonen noticed that the nesting check in early_iounmap() is not
actually done.

Reported-by: Mika Kukkonen <mikukkon@srv1-m700-lanp.koti>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: torvalds@linux-foundation.org
Cc: arjan@linux.intel.com
Cc: mikukkon@iki.fi
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 3 insertions, 2 deletions

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 71bb3159031a..2b2bb3f9b683 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -593,10 +593,11 @@ void __init early_iounmap(void *addr, unsigned long size)
         unsigned long offset;
         unsigned int nrpages;
         enum fixed_addresses idx;
-        unsigned int nesting;
+        int nesting;
 
         nesting = --early_ioremap_nested;
-        WARN_ON(nesting < 0);
+        if (WARN_ON(nesting < 0))
+                return;
 
         if (early_ioremap_debug) {
                 printk(KERN_INFO "early_iounmap(%p, %08lx) [%d]\n", addr,