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authorDenis V. Lunev <den@openvz.org>2008-04-29 01:02:27 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-29 08:06:22 -0700
commitcf7acfab032ff262f42954328cdfd20a5d9aaaac (patch)
tree231698d72d4508f3b26f606f18ef844387ec43e5 /drivers/acpi/processor_perflib.c
parent667471386d4068e75a6a55b615701ced61eb6333 (diff)
acpi: use non-racy method for proc entries creation
Use proc_create()/proc_create_data() to make sure that ->proc_fops and ->data be setup before gluing PDE to main tree. Add correct ->owner to proc_fops to fix reading/module unloading race. Signed-off-by: Denis V. Lunev <den@openvz.org> Cc: Len Brown <lenb@kernel.org> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/acpi/processor_perflib.c')
-rw-r--r--drivers/acpi/processor_perflib.c13
1 files changed, 4 insertions, 9 deletions
diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index b477a4be8a6..d80b2d1441a 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -411,6 +411,7 @@ EXPORT_SYMBOL(acpi_processor_notify_smm);
static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
static struct file_operations acpi_processor_perf_fops = {
+ .owner = THIS_MODULE,
.open = acpi_processor_perf_open_fs,
.read = seq_read,
.llseek = seq_lseek,
@@ -456,7 +457,6 @@ static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
static void acpi_cpufreq_add_file(struct acpi_processor *pr)
{
- struct proc_dir_entry *entry = NULL;
struct acpi_device *device = NULL;
@@ -464,14 +464,9 @@ static void acpi_cpufreq_add_file(struct acpi_processor *pr)
return;
/* add file 'performance' [R/W] */
- entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
- S_IFREG | S_IRUGO,
- acpi_device_dir(device));
- if (entry){
- entry->proc_fops = &acpi_processor_perf_fops;
- entry->data = acpi_driver_data(device);
- entry->owner = THIS_MODULE;
- }
+ proc_create_data(ACPI_PROCESSOR_FILE_PERFORMANCE, S_IFREG | S_IRUGO,
+ acpi_device_dir(device),
+ &acpi_processor_perf_fops, acpi_driver_data(device));
return;
}