[POWERPC] Fix dcr_unmap()

Fix a bug in dcr_unmap().

At unmap time the DCR offset need to be added instead of substracted.

Signed-off-by: Jean-Christophe Dubois <jdubois@mc.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/sysdev/dcr.c b/arch/powerpc/sysdev/dcr.c
index dffeeaeca1d938ea9ef740d9d5be5a114b336f0f..1fc5819e7d18d595b7f37e364ce9b52e8efe9591 100644 (file)
--- a/arch/powerpc/sysdev/dcr.c
+++ b/arch/powerpc/sysdev/dcr.c
@@ -129,7 +129,7 @@ void dcr_unmap(dcr_host_t host, unsigned int dcr_n, unsigned int dcr_c)
 
        if (h.token == NULL)
                return;
-       h.token -= dcr_n * h.stride;
+       h.token += dcr_n * h.stride;
        iounmap(h.token);
        h.token = NULL;
 }