[PATCH] fix oprofile module unloading

[Atsushi Nemoto <anemo@xxxxxxxxxxxxx>]

When unloading oprofile module with timer-mode, oprofile_arch_exit
dereferences a NULL pointer.  This patch fixes it and also fix a
sparse warning.

Signed-off-by: Atsushi Nemoto <anemo@xxxxxxxxxxxxx>

diff --git a/arch/mips/oprofile/common.c b/arch/mips/oprofile/common.c
index 935dd85..f2b4862 100644
--- a/arch/mips/oprofile/common.c
+++ b/arch/mips/oprofile/common.c
@@ -27,7 +27,7 @@ static int op_mips_setup(void)
 	model->reg_setup(ctr);
 
 	/* Configure the registers on all cpus.  */
-	on_each_cpu(model->cpu_setup, 0, 0, 1);
+	on_each_cpu(model->cpu_setup, NULL, 0, 1);
 
         return 0;
 }
@@ -114,5 +114,6 @@ int __init oprofile_arch_init(struct opr
 
 void oprofile_arch_exit(void)
 {
-	model->exit();
+	if (model)
+		model->exit();
 }