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authorAlexey Dobriyan <adobriyan@gmail.com>2009-03-25 22:48:06 +0300
committerAlexey Dobriyan <adobriyan@gmail.com>2009-03-31 01:14:44 +0400
commit99b76233803beab302123d243eea9e41149804f3 (patch)
tree398178210fe66845ccd6fa4258ba762a87e023ad /drivers/char/ipmi
parent3dec7f59c370c7b58184d63293c3dc984d475840 (diff)
downloadvexpress-lsk-99b76233803beab302123d243eea9e41149804f3.tar.gz
proc 2/2: remove struct proc_dir_entry::owner
Setting ->owner as done currently (pde->owner = THIS_MODULE) is racy as correctly noted at bug #12454. Someone can lookup entry with NULL ->owner, thus not pinning enything, and release it later resulting in module refcount underflow. We can keep ->owner and supply it at registration time like ->proc_fops and ->data. But this leaves ->owner as easy-manipulative field (just one C assignment) and somebody will forget to unpin previous/pin current module when switching ->owner. ->proc_fops is declared as "const" which should give some thoughts. ->read_proc/->write_proc were just fixed to not require ->owner for protection. rmmod'ed directories will be empty and return "." and ".." -- no harm. And directories with tricky enough readdir and lookup shouldn't be modular. We definitely don't want such modular code. Removing ->owner will also make PDE smaller. So, let's nuke it. Kudos to Jeff Layton for reminding about this, let's say, oversight. http://bugzilla.kernel.org/show_bug.cgi?id=12454 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Diffstat (limited to 'drivers/char/ipmi')
-rw-r--r--drivers/char/ipmi/ipmi_msghandler.c12
-rw-r--r--drivers/char/ipmi/ipmi_si_intf.c6
2 files changed, 7 insertions, 11 deletions
diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index 7a88dfd4427..e93fc8d22fb 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -1944,7 +1944,7 @@ static int stat_file_read_proc(char *page, char **start, off_t off,
int ipmi_smi_add_proc_entry(ipmi_smi_t smi, char *name,
read_proc_t *read_proc,
- void *data, struct module *owner)
+ void *data)
{
int rv = 0;
#ifdef CONFIG_PROC_FS
@@ -1970,7 +1970,6 @@ int ipmi_smi_add_proc_entry(ipmi_smi_t smi, char *name,
} else {
file->data = data;
file->read_proc = read_proc;
- file->owner = owner;
mutex_lock(&smi->proc_entry_lock);
/* Stick it on the list. */
@@ -1993,23 +1992,21 @@ static int add_proc_entries(ipmi_smi_t smi, int num)
smi->proc_dir = proc_mkdir(smi->proc_dir_name, proc_ipmi_root);
if (!smi->proc_dir)
rv = -ENOMEM;
- else
- smi->proc_dir->owner = THIS_MODULE;
if (rv == 0)
rv = ipmi_smi_add_proc_entry(smi, "stats",
stat_file_read_proc,
- smi, THIS_MODULE);
+ smi);
if (rv == 0)
rv = ipmi_smi_add_proc_entry(smi, "ipmb",
ipmb_file_read_proc,
- smi, THIS_MODULE);
+ smi);
if (rv == 0)
rv = ipmi_smi_add_proc_entry(smi, "version",
version_file_read_proc,
- smi, THIS_MODULE);
+ smi);
#endif /* CONFIG_PROC_FS */
return rv;
@@ -4265,7 +4262,6 @@ static int ipmi_init_msghandler(void)
return -ENOMEM;
}
- proc_ipmi_root->owner = THIS_MODULE;
#endif /* CONFIG_PROC_FS */
setup_timer(&ipmi_timer, ipmi_timeout, 0);
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index 3000135f2ea..e58ea4cd55c 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -2899,7 +2899,7 @@ static int try_smi_init(struct smi_info *new_smi)
rv = ipmi_smi_add_proc_entry(new_smi->intf, "type",
type_file_read_proc,
- new_smi, THIS_MODULE);
+ new_smi);
if (rv) {
printk(KERN_ERR
"ipmi_si: Unable to create proc entry: %d\n",
@@ -2909,7 +2909,7 @@ static int try_smi_init(struct smi_info *new_smi)
rv = ipmi_smi_add_proc_entry(new_smi->intf, "si_stats",
stat_file_read_proc,
- new_smi, THIS_MODULE);
+ new_smi);
if (rv) {
printk(KERN_ERR
"ipmi_si: Unable to create proc entry: %d\n",
@@ -2919,7 +2919,7 @@ static int try_smi_init(struct smi_info *new_smi)
rv = ipmi_smi_add_proc_entry(new_smi->intf, "params",
param_read_proc,
- new_smi, THIS_MODULE);
+ new_smi);
if (rv) {
printk(KERN_ERR
"ipmi_si: Unable to create proc entry: %d\n",