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authorPravin B Shelar <pshelar@nicira.com>2013-08-23 12:45:04 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-09-14 06:54:55 -0700
commita8077ef001460c41bc0509b096d3d342002c4d9b (patch)
treef1d251921694454c55a89e7302d6807b8a95d104
parente307a8acf8c075261f8110b7088f20d2f7206f56 (diff)
genl: Hold reference on correct module while netlink-dump.
[ Upstream commit 33c6b1f6b154894321f5734e50c66621e9134e7e ] netlink dump operations take module as parameter to hold reference for entire netlink dump duration. Currently it holds ref only on genl module which is not correct when we use ops registered to genl from another module. Following patch adds module pointer to genl_ops so that netlink can hold ref count on it. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> CC: Jesse Gross <jesse@nicira.com> CC: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--include/net/genetlink.h20
-rw-r--r--net/netlink/genetlink.c20
2 files changed, 29 insertions, 11 deletions
diff --git a/include/net/genetlink.h b/include/net/genetlink.h
index 93024a47e0e2..8e0b6c856a13 100644
--- a/include/net/genetlink.h
+++ b/include/net/genetlink.h
@@ -61,6 +61,7 @@ struct genl_family {
struct list_head ops_list; /* private */
struct list_head family_list; /* private */
struct list_head mcast_groups; /* private */
+ struct module *module;
};
/**
@@ -121,9 +122,24 @@ struct genl_ops {
struct list_head ops_list;
};
-extern int genl_register_family(struct genl_family *family);
-extern int genl_register_family_with_ops(struct genl_family *family,
+extern int __genl_register_family(struct genl_family *family);
+
+static inline int genl_register_family(struct genl_family *family)
+{
+ family->module = THIS_MODULE;
+ return __genl_register_family(family);
+}
+
+extern int __genl_register_family_with_ops(struct genl_family *family,
struct genl_ops *ops, size_t n_ops);
+
+static inline int genl_register_family_with_ops(struct genl_family *family,
+ struct genl_ops *ops, size_t n_ops)
+{
+ family->module = THIS_MODULE;
+ return __genl_register_family_with_ops(family, ops, n_ops);
+}
+
extern int genl_unregister_family(struct genl_family *family);
extern int genl_register_ops(struct genl_family *, struct genl_ops *ops);
extern int genl_unregister_ops(struct genl_family *, struct genl_ops *ops);
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 8ee0b4506beb..393f17eea1a2 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -364,7 +364,7 @@ int genl_unregister_ops(struct genl_family *family, struct genl_ops *ops)
EXPORT_SYMBOL(genl_unregister_ops);
/**
- * genl_register_family - register a generic netlink family
+ * __genl_register_family - register a generic netlink family
* @family: generic netlink family
*
* Registers the specified family after validating it first. Only one
@@ -374,7 +374,7 @@ EXPORT_SYMBOL(genl_unregister_ops);
*
* Return 0 on success or a negative error code.
*/
-int genl_register_family(struct genl_family *family)
+int __genl_register_family(struct genl_family *family)
{
int err = -EINVAL;
@@ -430,10 +430,10 @@ errout_locked:
errout:
return err;
}
-EXPORT_SYMBOL(genl_register_family);
+EXPORT_SYMBOL(__genl_register_family);
/**
- * genl_register_family_with_ops - register a generic netlink family
+ * __genl_register_family_with_ops - register a generic netlink family
* @family: generic netlink family
* @ops: operations to be registered
* @n_ops: number of elements to register
@@ -457,12 +457,12 @@ EXPORT_SYMBOL(genl_register_family);
*
* Return 0 on success or a negative error code.
*/
-int genl_register_family_with_ops(struct genl_family *family,
+int __genl_register_family_with_ops(struct genl_family *family,
struct genl_ops *ops, size_t n_ops)
{
int err, i;
- err = genl_register_family(family);
+ err = __genl_register_family(family);
if (err)
return err;
@@ -476,7 +476,7 @@ err_out:
genl_unregister_family(family);
return err;
}
-EXPORT_SYMBOL(genl_register_family_with_ops);
+EXPORT_SYMBOL(__genl_register_family_with_ops);
/**
* genl_unregister_family - unregister generic netlink family
@@ -603,22 +603,24 @@ static int genl_family_rcv_msg(struct genl_family *family,
if (!family->parallel_ops) {
struct netlink_dump_control c = {
+ .module = family->module,
.data = ops,
.dump = genl_lock_dumpit,
.done = genl_lock_done,
};
genl_unlock();
- rc = netlink_dump_start(net->genl_sock, skb, nlh, &c);
+ rc = __netlink_dump_start(net->genl_sock, skb, nlh, &c);
genl_lock();
} else {
struct netlink_dump_control c = {
+ .module = family->module,
.dump = ops->dumpit,
.done = ops->done,
};
- rc = netlink_dump_start(net->genl_sock, skb, nlh, &c);
+ rc = __netlink_dump_start(net->genl_sock, skb, nlh, &c);
}
return rc;