[S390] smp: fix memory leak on __cpu_up

If sigp_set_prefix fails on __cpu_up we leak the lowcore structures
and async+panic stacks for the failed cpu.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2 files changed, 3 insertions, 5 deletions

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index bb3d34aa7b85..1f4711b60aab 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -508,7 +508,6 @@ out:
         return -ENOMEM;
 }
 
-#ifdef CONFIG_HOTPLUG_CPU
 static void smp_free_lowcore(int cpu)
 {
         struct _lowcore *lowcore;
@@ -527,7 +526,6 @@ static void smp_free_lowcore(int cpu)
         free_pages((unsigned long) lowcore, lc_order);
         lowcore_ptr[cpu] = NULL;
 }
-#endif /* CONFIG_HOTPLUG_CPU */
 
 /* Upping and downing of CPUs */
 int __cpuinit __cpu_up(unsigned int cpu)
@@ -544,8 +542,10 @@ int __cpuinit __cpu_up(unsigned int cpu)
 
         ccode = signal_processor_p((__u32)(unsigned long)(lowcore_ptr[cpu]),
                                    cpu, sigp_set_prefix);
-        if (ccode)
+        if (ccode) {
+                smp_free_lowcore(cpu);
                 return -EIO;
+        }
 
         idle = current_set[cpu];
         cpu_lowcore = lowcore_ptr[cpu];
diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c
index 690e17819686..89b2e7f1b7a9 100644
--- a/arch/s390/kernel/vdso.c
+++ b/arch/s390/kernel/vdso.c
@@ -144,7 +144,6 @@ out:
         return -ENOMEM;
 }
 
-#ifdef CONFIG_HOTPLUG_CPU
 void vdso_free_per_cpu(int cpu, struct _lowcore *lowcore)
 {
         unsigned long segment_table, page_table, page_frame;
@@ -163,7 +162,6 @@ void vdso_free_per_cpu(int cpu, struct _lowcore *lowcore)
         free_page(page_table);
         free_pages(segment_table, SEGMENT_ORDER);
 }
-#endif /* CONFIG_HOTPLUG_CPU */
 
 static void __vdso_init_cr5(void *dummy)
 {