On Wed, Jan 11, 2017 at 08:54:21PM -0500, tedheadster wrote:
> Tejun,
> I'm interested in debugging this. What can I do to help?
Sorry about taking so long. I suck. :)
Can you please try the following patch and post what the kernel prints
out?
Thanks.
---
drivers/ata/pata_legacy.c | 2 ++
drivers/base/core.c | 9 +++++++++
include/linux/kobject.h | 1 +
lib/kobject.c | 22 ++++++++++++++++++++++
4 files changed, 34 insertions(+)
--- a/drivers/ata/pata_legacy.c
+++ b/drivers/ata/pata_legacy.c
@@ -962,6 +962,8 @@ static __init int legacy_init_one(struct
if (IS_ERR(pdev))
return PTR_ERR(pdev);
+ pdev->dev.kobj.release_debug = true;
+
ret = -EBUSY;
if (devm_request_region(&pdev->dev, io, 8, "pata_legacy") == NULL ||
devm_request_region(&pdev->dev, io + 0x0206, 1,
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -803,8 +803,17 @@ static void device_release(struct kobjec
* is deleted but alive, so release devres here to avoid
* possible memory leak.
*/
+ if (kobj->release_debug)
+ dev_info(dev, "XXX device_release: drel=%pf trel=%pf cdrel=%pf\n",
+ dev->release,
+ dev->type ? dev->type->release : NULL,
+ dev->class ? dev->class->dev_release : NULL);
+
devres_release_all(dev);
+ if (kobj->release_debug)
+ dev_info(dev, "XXX device_release: devres_release_all() done\n");
+
if (dev->release)
dev->release(dev);
else if (dev->type && dev->type->release)
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -76,6 +76,7 @@ struct kobject {
unsigned int state_add_uevent_sent:1;
unsigned int state_remove_uevent_sent:1;
unsigned int uevent_suppress:1;
+ unsigned int release_debug:1;
};
extern __printf(2, 3)
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -595,6 +595,13 @@ struct kobject *kobject_get(struct kobje
WARN(1, KERN_WARNING "kobject: '%s' (%p): is not "
"initialized, yet kobject_get() is being "
"called.\n", kobject_name(kobj), kobj);
+ if (kobj->release_debug)
+ printk("XXX kobject_get(%s): ref=%d++ (%pf:%pf:%pf)\n",
+ kobject_name(kobj),
+ atomic_read(&kobj->kref.refcount),
+ __builtin_return_address(1),
+ __builtin_return_address(2),
+ __builtin_return_address(3));
kref_get(&kobj->kref);
}
return kobj;
@@ -620,6 +627,14 @@ static void kobject_cleanup(struct kobje
pr_debug("kobject: '%s' (%p): %s, parent %p\n",
kobject_name(kobj), kobj, __func__, kobj->parent);
+ if (kobj->release_debug)
+ printk("XXX kobject_cleanup(%s): rel=%pf (%pf:%pf:%pf)\n",
+ kobject_name(kobj),
+ (t && t->release) ? t->release : NULL,
+ __builtin_return_address(1),
+ __builtin_return_address(2),
+ __builtin_return_address(3));
+
if (t && !t->release)
pr_debug("kobject: '%s' (%p): does not have a release() "
"function, it is broken and must be fixed.\n",
@@ -688,6 +703,13 @@ void kobject_put(struct kobject *kobj)
WARN(1, KERN_WARNING "kobject: '%s' (%p): is not "
"initialized, yet kobject_put() is being "
"called.\n", kobject_name(kobj), kobj);
+ if (kobj->release_debug)
+ printk("XXX kobject_put(%s): ref=%d-- (%pf:%pf:%pf)\n",
+ kobject_name(kobj),
+ atomic_read(&kobj->kref.refcount),
+ __builtin_return_address(1),
+ __builtin_return_address(2),
+ __builtin_return_address(3));
kref_put(&kobj->kref, kobject_release);
}
}
--
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