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i2c: dev: Fix the race between the release of i2c_dev and cdev 

The struct cdev is embedded in the struct i2c_dev. In the current code,
we would free the i2c_dev struct directly in put_i2c_dev(), but the
cdev is manged by a kobject, and the release of it is not predictable.
So it is very possible that the i2c_dev is freed before the cdev is
entirely released. We can easily get the following call trace with
CONFIG_DEBUG_KOBJECT_RELEASE and CONFIG_DEBUG_OBJECTS_TIMERS enabled.
  ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x38
  WARNING: CPU: 19 PID: 1 at lib/debugobjects.c:325 debug_print_object+0xb0/0xf0
  Modules linked in:
  CPU: 19 PID: 1 Comm: swapper/0 Tainted: G        W         5.2.20-yocto-standard+ #120
  Hardware name: Marvell OcteonTX CN96XX board (DT)
  pstate: 80c00089 (Nzcv daIf +PAN +UAO)
  pc : debug_print_object+0xb0/0xf0
  lr : debug_print_object+0xb0/0xf0
  sp : ffff00001292f7d0
  x29: ffff00001292f7d0 x28: ffff800b82151788
  x27: 0000000000000001 x26: ffff800b892c0000
  x25: ffff0000124a2558 x24: 0000000000000000
  x23: ffff00001107a1d8 x22: ffff0000116b5088
  x21: ffff800bdc6afca8 x20: ffff000012471ae8
  x19: ffff00001168f2c8 x18: 0000000000000010
  x17: 00000000fd6f304b x16: 00000000ee79de43
  x15: ffff800bc0e80568 x14: 79616c6564203a74
  x13: 6e6968207473696c x12: 5f72656d6974203a
  x11: ffff0000113f0018 x10: 0000000000000000
  x9 : 000000000000001f x8 : 0000000000000000
  x7 : ffff0000101294cc x6 : 0000000000000000
  x5 : 0000000000000000 x4 : 0000000000000001
  x3 : 00000000ffffffff x2 : 0000000000000000
  x1 : 387fc15c8ec0f200 x0 : 0000000000000000
  Call trace:
   debug_print_object+0xb0/0xf0
   __debug_check_no_obj_freed+0x19c/0x228
   debug_check_no_obj_freed+0x1c/0x28
   kfree+0x250/0x440
   put_i2c_dev+0x68/0x78
   i2cdev_detach_adapter+0x60/0xc8
   i2cdev_notifier_call+0x3c/0x70
   notifier_call_chain+0x8c/0xe8
   blocking_notifier_call_chain+0x64/0x88
   device_del+0x74/0x380
   device_unregister+0x54/0x78
   i2c_del_adapter+0x278/0x2d0
   unittest_i2c_bus_remove+0x3c/0x80
   platform_drv_remove+0x30/0x50
   device_release_driver_internal+0xf4/0x1c0
   driver_detach+0x58/0xa0
   bus_remove_driver+0x84/0xd8
   driver_unregister+0x34/0x60
   platform_driver_unregister+0x20/0x30
   of_unittest_overlay+0x8d4/0xbe0
   of_unittest+0xae8/0xb3c
   do_one_initcall+0xac/0x450
   do_initcall_level+0x208/0x224
   kernel_init_freeable+0x2d8/0x36c
   kernel_init+0x18/0x108
   ret_from_fork+0x10/0x1c
  irq event stamp: 3934661
  hardirqs last  enabled at (3934661): [<ffff00001009fa04>] debug_exception_exit+0x4c/0x58
  hardirqs last disabled at (3934660): [<ffff00001009fb14>] debug_exception_enter+0xa4/0xe0
  softirqs last  enabled at (3934654): [<ffff000010081d94>] __do_softirq+0x46c/0x628
  softirqs last disabled at (3934649): [<ffff0000100b4a1c>] irq_exit+0x104/0x118

This is a common issue when using cdev embedded in a struct.
Fortunately, we already have a mechanism to solve this kind of issue.
Please see commit 233ed09d7f ("chardev: add helper function to
register char devs with a struct device") for more detail.

In this patch, we choose to embed the struct device into the i2c_dev,
and use the API provided by the commit 233ed09d7f to make sure that
the release of i2c_dev and cdev are in sequence.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Kevin Hao 2019-10-11 23:00:14 +08:00 committed by Wolfram Sang
parent 383c67cda2
commit 1413ef638a
1 changed files with 25 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
drivers/i2c/i2c-dev.c
View File

@ -40,7 +40,7 @@
struct i2c_dev {
struct list_head list;
struct i2c_adapter *adap;
struct device *dev;
struct device dev;
struct cdev cdev;
};
@ -84,12 +84,14 @@ static struct i2c_dev *get_free_i2c_dev(struct i2c_adapter *adap)
return i2c_dev;
}
static void put_i2c_dev(struct i2c_dev *i2c_dev)
static void put_i2c_dev(struct i2c_dev *i2c_dev, bool del_cdev)
{
spin_lock(&i2c_dev_list_lock);
list_del(&i2c_dev->list);
spin_unlock(&i2c_dev_list_lock);
kfree(i2c_dev);
if (del_cdev)
cdev_device_del(&i2c_dev->cdev, &i2c_dev->dev);
put_device(&i2c_dev->dev);
}
static ssize_t name_show(struct device *dev,
@ -628,6 +630,14 @@ static const struct file_operations i2cdev_fops = {
static struct class *i2c_dev_class;
static void i2cdev_dev_release(struct device *dev)
{
struct i2c_dev *i2c_dev;
i2c_dev = container_of(dev, struct i2c_dev, dev);
kfree(i2c_dev);
}
static int i2cdev_attach_adapter(struct device *dev, void *dummy)
{
struct i2c_adapter *adap;
@ -644,27 +654,23 @@ static int i2cdev_attach_adapter(struct device *dev, void *dummy)
cdev_init(&i2c_dev->cdev, &i2cdev_fops);
i2c_dev->cdev.owner = THIS_MODULE;
res = cdev_add(&i2c_dev->cdev, MKDEV(I2C_MAJOR, adap->nr), 1);
if (res)
goto error_cdev;
/* register this i2c device with the driver core */
i2c_dev->dev = device_create(i2c_dev_class, &adap->dev,
MKDEV(I2C_MAJOR, adap->nr), NULL,
"i2c-%d", adap->nr);
if (IS_ERR(i2c_dev->dev)) {
res = PTR_ERR(i2c_dev->dev);
goto error;
device_initialize(&i2c_dev->dev);
i2c_dev->dev.devt = MKDEV(I2C_MAJOR, adap->nr);
i2c_dev->dev.class = i2c_dev_class;
i2c_dev->dev.parent = &adap->dev;
i2c_dev->dev.release = i2cdev_dev_release;
dev_set_name(&i2c_dev->dev, "i2c-%d", adap->nr);
res = cdev_device_add(&i2c_dev->cdev, &i2c_dev->dev);
if (res) {
put_i2c_dev(i2c_dev, false);
return res;
}
pr_debug("i2c-dev: adapter [%s] registered as minor %d\n",
adap->name, adap->nr);
return 0;
error:
cdev_del(&i2c_dev->cdev);
error_cdev:
put_i2c_dev(i2c_dev);
return res;
}
static int i2cdev_detach_adapter(struct device *dev, void *dummy)
@ -680,9 +686,7 @@ static int i2cdev_detach_adapter(struct device *dev, void *dummy)
if (!i2c_dev) /* attach_adapter must have failed */
return 0;
cdev_del(&i2c_dev->cdev);
put_i2c_dev(i2c_dev);
device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr));
put_i2c_dev(i2c_dev, true);
pr_debug("i2c-dev: adapter [%s] unregistered\n", adap->name);
return 0;