drivers: 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.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

5 files changed, 23 insertions, 28 deletions

diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c
index 8609b8236c67..f49037b744f9 100644
--- a/drivers/char/i8k.c
+++ b/drivers/char/i8k.c
@@ -82,6 +82,7 @@ static int i8k_ioctl(struct inode *, struct file *, unsigned int,
                      unsigned long);
 
 static const struct file_operations i8k_fops = {
+        .owner          = THIS_MODULE,
         .open           = i8k_open_fs,
         .read           = seq_read,
         .llseek         = seq_lseek,
@@ -554,13 +555,10 @@ static int __init i8k_init(void)
                 return -ENODEV;
 
         /* Register the proc entry */
-        proc_i8k = create_proc_entry("i8k", 0, NULL);
+        proc_i8k = proc_create("i8k", 0, NULL, &i8k_fops);
         if (!proc_i8k)
                 return -ENOENT;
 
-        proc_i8k->proc_fops = &i8k_fops;
-        proc_i8k->owner = THIS_MODULE;
-
         printk(KERN_INFO
                "Dell laptop SMM driver v%s Massimo Dal Zotto (dz@debian.org)\n",
                I8K_VERSION);
diff --git a/drivers/char/misc.c b/drivers/char/misc.c
index 4d058dadbfcc..eaace0db0ff4 100644
--- a/drivers/char/misc.c
+++ b/drivers/char/misc.c
@@ -263,23 +263,26 @@ EXPORT_SYMBOL(misc_deregister);
 
 static int __init misc_init(void)
 {
-#ifdef CONFIG_PROC_FS
-        struct proc_dir_entry *ent;
+        int err;
 
-        ent = create_proc_entry("misc", 0, NULL);
-        if (ent)
-                ent->proc_fops = &misc_proc_fops;
+#ifdef CONFIG_PROC_FS
+        proc_create("misc", 0, NULL, &misc_proc_fops);
 #endif
         misc_class = class_create(THIS_MODULE, "misc");
+        err = PTR_ERR(misc_class);
         if (IS_ERR(misc_class))
-                return PTR_ERR(misc_class);
+                goto fail_remove;
 
-        if (register_chrdev(MISC_MAJOR,"misc",&misc_fops)) {
-                printk("unable to get major %d for misc devices\n",
-                       MISC_MAJOR);
-                class_destroy(misc_class);
-                return -EIO;
-        }
+        err = -EIO;
+        if (register_chrdev(MISC_MAJOR,"misc",&misc_fops))
+                goto fail_printk;
         return 0;
+
+fail_printk:
+        printk("unable to get major %d for misc devices\n", MISC_MAJOR);
+        class_destroy(misc_class);
+fail_remove:
+        remove_proc_entry("misc", NULL);
+        return err;
 }
 subsys_initcall(misc_init);
diff --git a/drivers/char/rtc.c b/drivers/char/rtc.c
index e2ec2ee4cf79..5f80a9dff573 100644
--- a/drivers/char/rtc.c
+++ b/drivers/char/rtc.c
@@ -1069,10 +1069,8 @@ no_irq:
         }
 
 #ifdef CONFIG_PROC_FS
-        ent = create_proc_entry("driver/rtc", 0, NULL);
-        if (ent)
-                ent->proc_fops = &rtc_proc_fops;
-        else
+        ent = proc_create("driver/rtc", 0, NULL, &rtc_proc_fops);
+        if (!ent)
                 printk(KERN_WARNING "rtc: Failed to register with procfs.\n");
 #endif
 
diff --git a/drivers/char/toshiba.c b/drivers/char/toshiba.c
index ce5ebe3b168f..64f1ceed0b2c 100644
--- a/drivers/char/toshiba.c
+++ b/drivers/char/toshiba.c
@@ -520,12 +520,11 @@ static int __init toshiba_init(void)
         {
                 struct proc_dir_entry *pde;
 
-                pde = create_proc_entry("toshiba", 0, NULL);
+                pde = proc_create("toshiba", 0, NULL, &proc_toshiba_fops);
                 if (!pde) {
                         misc_deregister(&tosh_device);
                         return -ENOMEM;
                 }
-                pde->proc_fops = &proc_toshiba_fops;
         }
 #endif
 
diff --git a/drivers/char/viotape.c b/drivers/char/viotape.c
index db7a731e2362..58aad63831f4 100644
--- a/drivers/char/viotape.c
+++ b/drivers/char/viotape.c
@@ -249,6 +249,7 @@ static int proc_viotape_open(struct inode *inode, struct file *file)
 }
 
 static const struct file_operations proc_viotape_operations = {
+        .owner          = THIS_MODULE,
         .open           = proc_viotape_open,
         .read           = seq_read,
         .llseek         = seq_lseek,
@@ -915,7 +916,6 @@ static struct vio_driver viotape_driver = {
 int __init viotap_init(void)
 {
         int ret;
-        struct proc_dir_entry *e;
 
         if (!firmware_has_feature(FW_FEATURE_ISERIES))
                 return -ENODEV;
@@ -968,11 +968,8 @@ int __init viotap_init(void)
         if (ret)
                 goto unreg_class;
 
-        e = create_proc_entry("iSeries/viotape", S_IFREG|S_IRUGO, NULL);
-        if (e) {
-                e->owner = THIS_MODULE;
-                e->proc_fops = &proc_viotape_operations;
-        }
+        proc_create("iSeries/viotape", S_IFREG|S_IRUGO, NULL,
+                    &proc_viotape_operations);
 
         return 0;