From 7b9d1b22a382aa221018c19880ee22c44467feec Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Mon, 9 Jun 2008 15:50:30 -0700 Subject: iucv: prevent cpu hotplug when walking cpu_online_map. The code used preempt_disable() to prevent cpu hotplug, however that doesn't protect for cpus being added. So use get_online_cpus() instead. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky Signed-off-by: Ursula Braun Signed-off-by: David S. Miller --- net/iucv/iucv.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) (limited to 'net/iucv/iucv.c') diff --git a/net/iucv/iucv.c b/net/iucv/iucv.c index 2d43175b0cdb..531a206ce7a6 100644 --- a/net/iucv/iucv.c +++ b/net/iucv/iucv.c @@ -474,14 +474,14 @@ static void iucv_setmask_mp(void) { int cpu; - preempt_disable(); + get_online_cpus(); for_each_online_cpu(cpu) /* Enable all cpus with a declared buffer. */ if (cpu_isset(cpu, iucv_buffer_cpumask) && !cpu_isset(cpu, iucv_irq_cpumask)) smp_call_function_single(cpu, iucv_allow_cpu, NULL, 0, 1); - preempt_enable(); + put_online_cpus(); } /** @@ -521,16 +521,17 @@ static int iucv_enable(void) goto out; /* Declare per cpu buffers. */ rc = -EIO; - preempt_disable(); + get_online_cpus(); for_each_online_cpu(cpu) smp_call_function_single(cpu, iucv_declare_cpu, NULL, 0, 1); - preempt_enable(); if (cpus_empty(iucv_buffer_cpumask)) /* No cpu could declare an iucv buffer. */ goto out_path; + put_online_cpus(); return 0; out_path: + put_online_cpus(); kfree(iucv_path_table); out: return rc; @@ -545,7 +546,9 @@ out: */ static void iucv_disable(void) { + get_online_cpus(); on_each_cpu(iucv_retrieve_cpu, NULL, 0, 1); + put_online_cpus(); kfree(iucv_path_table); } -- cgit v1.2.3-59-g8ed1b