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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/platform
parent3dec7f59c370c7b58184d63293c3dc984d475840 (diff)
downloadop-kernel-dev-99b76233803beab302123d243eea9e41149804f3.zip
op-kernel-dev-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/platform')
-rw-r--r--drivers/platform/x86/asus_acpi.c3
-rw-r--r--drivers/platform/x86/thinkpad_acpi.c2
-rw-r--r--drivers/platform/x86/toshiba_acpi.c3
3 files changed, 0 insertions, 8 deletions
diff --git a/drivers/platform/x86/asus_acpi.c b/drivers/platform/x86/asus_acpi.c
index d63f26e..ba1f749 100644
--- a/drivers/platform/x86/asus_acpi.c
+++ b/drivers/platform/x86/asus_acpi.c
@@ -987,7 +987,6 @@ asus_proc_add(char *name, proc_writefunc *writefunc,
proc->write_proc = writefunc;
proc->read_proc = readfunc;
proc->data = acpi_driver_data(device);
- proc->owner = THIS_MODULE;
proc->uid = asus_uid;
proc->gid = asus_gid;
return 0;
@@ -1020,7 +1019,6 @@ static int asus_hotk_add_fs(struct acpi_device *device)
if (proc) {
proc->read_proc = proc_read_info;
proc->data = acpi_driver_data(device);
- proc->owner = THIS_MODULE;
proc->uid = asus_uid;
proc->gid = asus_gid;
} else {
@@ -1436,7 +1434,6 @@ static int __init asus_acpi_init(void)
printk(KERN_ERR "Asus ACPI: Unable to create /proc entry\n");
return -ENODEV;
}
- asus_proc_dir->owner = THIS_MODULE;
result = acpi_bus_register_driver(&asus_hotk_driver);
if (result < 0) {
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index d243320..3dad27a3 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -6992,7 +6992,6 @@ static int __init ibm_init(struct ibm_init_struct *iibm)
ret = -ENODEV;
goto err_out;
}
- entry->owner = THIS_MODULE;
entry->data = ibm;
entry->read_proc = &dispatch_procfs_read;
if (ibm->write)
@@ -7405,7 +7404,6 @@ static int __init thinkpad_acpi_module_init(void)
thinkpad_acpi_module_exit();
return -ENODEV;
}
- proc_dir->owner = THIS_MODULE;
ret = platform_driver_register(&tpacpi_pdriver);
if (ret) {
diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
index 40e60fc..9f18726 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -679,8 +679,6 @@ static acpi_status __init add_device(void)
toshiba_proc_dir,
(read_proc_t *) dispatch_read,
item);
- if (proc)
- proc->owner = THIS_MODULE;
if (proc && item->write_func)
proc->write_proc = (write_proc_t *) dispatch_write;
}
@@ -772,7 +770,6 @@ static int __init toshiba_acpi_init(void)
toshiba_acpi_exit();
return -ENODEV;
} else {
- toshiba_proc_dir->owner = THIS_MODULE;
status = add_device();
if (ACPI_FAILURE(status)) {
toshiba_acpi_exit();
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