Hi Ming/ Greg
Curious to know your comments on this patch.
On 04/26/2016 10:57 PM, Chandra Sekhar Lingutla wrote:
Hi Ming,
On 03/28/2016 01:57 PM, Ming Lei wrote:
The global mutex of 'gdp_mutex' is used to serialize creating/querying
glue dir and its cleanup. Turns out it isn't a perfect way because
part(kobj_kset_leave()) of the actual cleanup action() is done inside
the release handler of the glue dir kobject. That means gdp_mutex has
to be held before releasing the last reference count of the glue dir
kobject.
This patch moves glue dir's cleanup after kobject_del() in device_del()
for avoiding the race.
Cc: Yijing Wang <[email protected]>
Reported-by: Chandra Sekhar Lingutla <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
---
drivers/base/core.c | 41 +++++++++++++++++++++++++++++++----------
1 file changed, 31 insertions(+), 10 deletions(-)
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 0a8bdad..3f2e1f8 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -836,11 +836,31 @@ static struct kobject *get_device_parent(struct device
*dev,
return NULL;
}
+static inline bool live_in_glue_dir(struct kobject *kobj,
+ struct device *dev)
+{
+ if (!kobj || !dev->class ||
+ kobj->kset != &dev->class->p->glue_dirs)
+ return true;
+ return false;
+}
I think we should return false if kobj->kset != &dev->class->p->glue_dirs.
If kboj->kset points to dev->class->p->glue_dirs, then we live in glue dir.
So logic should be:
if (!kobj || !dev->class ||
kobj->kset != &dev->class->p->glue_dirs)
return false;
return true;
+
+static inline struct kobject *get_glue_dir(struct device *dev)
+{
+ if (live_in_glue_dir(&dev->kobj, dev))
+ return dev->kobj.parent;
+ return NULL;
+}
+
+/*
+ * make sure cleaning up dir as the last step, we need to make
+ * sure .release handler of kobject is run with holding the
+ * global lock
+ */
static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir)
{
/* see if we live in a "glue" directory */
- if (!glue_dir || !dev->class ||
- glue_dir->kset != &dev->class->p->glue_dirs)
+ if (!live_in_glue_dir(glue_dir, dev))
return;
mutex_lock(&gdp_mutex);
@@ -848,11 +868,6 @@ static void cleanup_glue_dir(struct device *dev, struct
kobject *glue_dir)
mutex_unlock(&gdp_mutex);
}
-static void cleanup_device_parent(struct device *dev)
-{
- cleanup_glue_dir(dev, dev->kobj.parent);
-}
-
static int device_add_class_symlinks(struct device *dev)
{
struct device_node *of_node = dev_of_node(dev);
@@ -1028,6 +1043,7 @@ int device_add(struct device *dev)
struct kobject *kobj;
struct class_interface *class_intf;
int error = -EINVAL;
+ struct kobject *glue_dir = NULL;
dev = get_device(dev);
if (!dev)
@@ -1072,8 +1088,10 @@ int device_add(struct device *dev)
/* first, register with generic layer. */
/* we require the name to be set before, and pass NULL */
error = kobject_add(&dev->kobj, dev->kobj.parent, NULL);
- if (error)
+ if (error) {
+ glue_dir = get_glue_dir(dev);
goto Error;
+ }
/* notify platform of device entry */
if (platform_notify)
@@ -1154,9 +1172,10 @@ done:
device_remove_file(dev, &dev_attr_uevent);
attrError:
kobject_uevent(&dev->kobj, KOBJ_REMOVE);
+ glue_dir = get_glue_dir(dev);
kobject_del(&dev->kobj);
Error:
- cleanup_device_parent(dev);
+ cleanup_glue_dir(dev, glue_dir);
put_device(parent);
name_error:
kfree(dev->p);
@@ -1232,6 +1251,7 @@ EXPORT_SYMBOL_GPL(put_device);
void device_del(struct device *dev)
{
struct device *parent = dev->parent;
+ struct kobject *glue_dir = NULL;
struct class_interface *class_intf;
/* Notify clients of device removal. This call must come
@@ -1276,8 +1296,9 @@ void device_del(struct device *dev)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
BUS_NOTIFY_REMOVED_DEVICE, dev);
kobject_uevent(&dev->kobj, KOBJ_REMOVE);
- cleanup_device_parent(dev);
+ glue_dir = get_glue_dir(dev);
kobject_del(&dev->kobj);
+ cleanup_glue_dir(dev, glue_dir);
put_device(parent);
}
EXPORT_SYMBOL_GPL(device_del);
--
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