Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7c7a9bccd2ba9f17e4b588461f140578a0a7b073
Commit: 7c7a9bccd2ba9f17e4b588461f140578a0a7b073
Parent: ab64b960673250518e748f8b4f1545447136b68b
Author: Roland Dreier <[EMAIL PROTECTED]>
AuthorDate: Tue Feb 12 14:38:27 2008 -0800
Committer: Roland Dreier <[EMAIL PROTECTED]>
CommitDate: Tue Feb 12 14:38:27 2008 -0800
IB/cm: Fix infiniband_cm class kobject ref counting
Commit 9af57b7a ("IB/cm: Add basic performance counters") introduced a
bug in how the reference count for cm_class.subsys.kobj was handled:
the path that released a device did a kobject_put() on that kobject, but
there was no kobject_get() in the path the handles adding a device. So
the reference count ended up too low, which leads to bad things. Fix up
and simplify the reference counting to avoid this.
(Actually, I introduced the bug when fixing the patch up to match some
of Greg's kobject changes, but who's counting)
Signed-off-by: Roland Dreier <[EMAIL PROTECTED]>
---
drivers/infiniband/core/cm.c | 22 ++++++++--------------
1 files changed, 8 insertions(+), 14 deletions(-)
diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c
index 435e276..b10ade9 100644
--- a/drivers/infiniband/core/cm.c
+++ b/drivers/infiniband/core/cm.c
@@ -3612,18 +3612,12 @@ struct class cm_class = {
};
EXPORT_SYMBOL(cm_class);
-static void cm_remove_fs_obj(struct kobject *obj)
-{
- kobject_put(obj->parent);
- kobject_put(obj);
-}
-
static int cm_create_port_fs(struct cm_port *port)
{
int i, ret;
ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
- kobject_get(&port->cm_dev->dev_obj),
+ &port->cm_dev->dev_obj,
"%d", port->port_num);
if (ret) {
kfree(port);
@@ -3633,7 +3627,7 @@ static int cm_create_port_fs(struct cm_port *port)
for (i = 0; i < CM_COUNTER_GROUPS; i++) {
ret = kobject_init_and_add(&port->counter_group[i].obj,
&cm_counter_obj_type,
- kobject_get(&port->port_obj),
+ &port->port_obj,
"%s", counter_group_names[i]);
if (ret)
goto error;
@@ -3643,8 +3637,8 @@ static int cm_create_port_fs(struct cm_port *port)
error:
while (i--)
- cm_remove_fs_obj(&port->counter_group[i].obj);
- cm_remove_fs_obj(&port->port_obj);
+ kobject_put(&port->counter_group[i].obj);
+ kobject_put(&port->port_obj);
return ret;
}
@@ -3654,9 +3648,9 @@ static void cm_remove_port_fs(struct cm_port *port)
int i;
for (i = 0; i < CM_COUNTER_GROUPS; i++)
- cm_remove_fs_obj(&port->counter_group[i].obj);
+ kobject_put(&port->counter_group[i].obj);
- cm_remove_fs_obj(&port->port_obj);
+ kobject_put(&port->port_obj);
}
static void cm_add_one(struct ib_device *device)
@@ -3740,7 +3734,7 @@ error1:
ib_unregister_mad_agent(port->mad_agent);
cm_remove_port_fs(port);
}
- cm_remove_fs_obj(&cm_dev->dev_obj);
+ kobject_put(&cm_dev->dev_obj);
}
static void cm_remove_one(struct ib_device *device)
@@ -3767,7 +3761,7 @@ static void cm_remove_one(struct ib_device *device)
ib_unregister_mad_agent(port->mad_agent);
cm_remove_port_fs(port);
}
- cm_remove_fs_obj(&cm_dev->dev_obj);
+ kobject_put(&cm_dev->dev_obj);
}
static int __init ib_cm_init(void)
-
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