[PATCH 28/29] drivers: use non-racy method for proc entries creation

Denis V. Lunev
2008-04-08T11:25:09Z

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>
CC: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/char/i8k.c | 6 ++----
drivers/char/misc.c | 27 +++++++++++++++------------
drivers/char/rtc.c | 6 ++----
drivers/char/toshiba.c | 3 +--
drivers/char/viotape.c | 9 +++------
5 files changed, 23 insertions(+), 28 deletions(-)

diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c
index 8609b82..f49037b 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 bc717e4..2f8ceb0 100644
--- a/drivers/char/misc.c
+++ b/drivers/char/misc.c
@@ -262,23 +262,26 @@ 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 5c3142b..b775df9 100644
--- a/drivers/char/rtc.c
+++ b/drivers/char/rtc.c
@@ -1068,10 +1068,8 @@ 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 ce5ebe3..64f1cee 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 db7a731..58aad63 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;

--
1.5.3.rc5