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authorHeiko Carstens <heiko.carstens@de.ibm.com>2008-04-30 13:38:36 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-04-30 13:38:44 +0200
commit0b18d318b80a7f350648ca8f7cc00a2f688104cb (patch)
tree7a5346faefb67b24f05c00691ca170a6805b0921 /arch/s390/kernel/smp.c
parentf291e17227cf30432ca7c402220f62e6924dd97d (diff)
[S390] smp: Fix locking order.
On some smp sysfs store attributes get_online_cpus() may block on cpu_hotplug.lock, but we hold already smp_cpu_state_mutex. Since the locking order on cpu hotplug via arch_update_cpu_topology is inverse this might lead to deadlocks. So make sure locking order is always the same. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/smp.c')
-rw-r--r--arch/s390/kernel/smp.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 0dfa988c1b2..6bb5c050640 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -890,8 +890,8 @@ static ssize_t cpu_configure_store(struct sys_device *dev, const char *buf,
if (val != 0 && val != 1)
return -EINVAL;
- mutex_lock(&smp_cpu_state_mutex);
get_online_cpus();
+ mutex_lock(&smp_cpu_state_mutex);
rc = -EBUSY;
if (cpu_online(cpu))
goto out;
@@ -919,8 +919,8 @@ static ssize_t cpu_configure_store(struct sys_device *dev, const char *buf,
break;
}
out:
- put_online_cpus();
mutex_unlock(&smp_cpu_state_mutex);
+ put_online_cpus();
return rc ? rc : count;
}
static SYSDEV_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store);
@@ -1095,8 +1095,8 @@ static ssize_t __ref rescan_store(struct sys_device *dev,
int cpu;
int rc;
- mutex_lock(&smp_cpu_state_mutex);
get_online_cpus();
+ mutex_lock(&smp_cpu_state_mutex);
newcpus = cpu_present_map;
rc = smp_rescan_cpus();
if (rc)
@@ -1109,8 +1109,8 @@ static ssize_t __ref rescan_store(struct sys_device *dev,
}
rc = 0;
out:
- put_online_cpus();
mutex_unlock(&smp_cpu_state_mutex);
+ put_online_cpus();
if (!cpus_empty(newcpus))
topology_schedule_update();
return rc ? rc : count;
@@ -1139,16 +1139,16 @@ static ssize_t dispatching_store(struct sys_device *dev, const char *buf,
if (val != 0 && val != 1)
return -EINVAL;
rc = 0;
- mutex_lock(&smp_cpu_state_mutex);
get_online_cpus();
+ mutex_lock(&smp_cpu_state_mutex);
if (cpu_management == val)
goto out;
rc = topology_set_cpu_management(val);
if (!rc)
cpu_management = val;
out:
- put_online_cpus();
mutex_unlock(&smp_cpu_state_mutex);
+ put_online_cpus();
return rc ? rc : count;
}
static SYSDEV_ATTR(dispatching, 0644, dispatching_show, dispatching_store);