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authorDave Jones <davej@redhat.com>2007-12-17 16:19:58 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-12-17 19:28:16 -0800
commitbd6cba53c524dccf72900435d29722b22f61d835 (patch)
treeef16fee47a90de1dc891f5814bee014ebe7f1546 /drivers/cpufreq
parent9548b209a37397f3036aa5bd3d5b4d3b725aa11a (diff)
downloadop-kernel-dev-bd6cba53c524dccf72900435d29722b22f61d835.zip
op-kernel-dev-bd6cba53c524dccf72900435d29722b22f61d835.tar.gz
cpufreq: fix missing unlocks in cpufreq_add_dev error paths.
Ingo hit some BUG_ONs that were probably caused by these missing unlocks causing an unbalance. He couldn't reproduce the bug reliably, so it's unknown that it's definitly fixing the problem he hit, but it's a fairly good chance, and this fixes an obvious bug. [ Dave: "Ingo followed up that he hit some lockdep related output with this applied, so it may not be right. I'll look at it after xmas if no-one has it figured out before then." Akpm: "It looks pretty correct to me though." ] Signed-off-by: Dave Jones <davej@redhat.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/cpufreq.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 5e626b1..79581fa 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -841,19 +841,25 @@ static int cpufreq_add_dev (struct sys_device * sys_dev)
drv_attr = cpufreq_driver->attr;
while ((drv_attr) && (*drv_attr)) {
ret = sysfs_create_file(&policy->kobj, &((*drv_attr)->attr));
- if (ret)
+ if (ret) {
+ unlock_policy_rwsem_write(cpu);
goto err_out_driver_exit;
+ }
drv_attr++;
}
if (cpufreq_driver->get){
ret = sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr);
- if (ret)
+ if (ret) {
+ unlock_policy_rwsem_write(cpu);
goto err_out_driver_exit;
+ }
}
if (cpufreq_driver->target){
ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr);
- if (ret)
+ if (ret) {
+ unlock_policy_rwsem_write(cpu);
goto err_out_driver_exit;
+ }
}
spin_lock_irqsave(&cpufreq_driver_lock, flags);
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