From: Dave Jones Date: Tue, 18 Dec 2007 00:19:58 +0000 (-0800) Subject: cpufreq: fix missing unlocks in cpufreq_add_dev error paths. X-Git-Tag: firefly_0821_release~23979 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=bd6cba53c524dccf72900435d29722b22f61d835;p=firefly-linux-kernel-4.4.55.git 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 Cc: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 5e626b12b97e..79581fab82d6 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);