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Commit 2c4a336e authored by Andy King's avatar Andy King Committed by David S. Miller
Browse files

vsock: Make transport the proto owner 



Right now the core vsock module is the owner of the proto family. This
means there's nothing preventing the transport module from unloading if
there are open sockets, which results in a panic. Fix that by allowing
the transport to be the owner, which will refcount it properly.

Includes version bump to 1.0.1.0-k

Passes checkpatch this time, I swear...

Acked-by: default avatarDmitry Torokhov <dtor@vmware.com>
Signed-off-by: default avatarAndy King <acking@vmware.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b8dff4e6

include/net/af_vsock.h

+5 −1
Original line number Diff line number Diff line
@@ -155,7 +155,11 @@ struct vsock_transport { 


/**** CORE ****/



int vsock_core_init(const struct vsock_transport *t);

int __vsock_core_init(const struct vsock_transport *t, struct module *owner);

static inline int vsock_core_init(const struct vsock_transport *t)

{

	return __vsock_core_init(t, THIS_MODULE);

}

void vsock_core_exit(void);



/**** UTILS ****/

net/vmw_vsock/af_vsock.c

+22 −25
Original line number Diff line number Diff line
@@ -1925,9 +1925,23 @@ static struct miscdevice vsock_device = { 
	.fops		= &vsock_device_ops,

};



static int __vsock_core_init(void)

int __vsock_core_init(const struct vsock_transport *t, struct module *owner)

{

	int err;

	int err = mutex_lock_interruptible(&vsock_register_mutex);



	if (err)

		return err;



	if (transport) {

		err = -EBUSY;

		goto err_busy;

	}



	/* Transport must be the owner of the protocol so that it can't

	 * unload while there are open sockets.

	 */

	vsock_proto.owner = owner;

	transport = t;



	vsock_init_tables();
@@ -1951,36 +1965,19 @@ static int __vsock_core_init(void) 
		goto err_unregister_proto;

	}



	mutex_unlock(&vsock_register_mutex);

	return 0;



err_unregister_proto:

	proto_unregister(&vsock_proto);

err_misc_deregister:

	misc_deregister(&vsock_device);

	return err;

}



int vsock_core_init(const struct vsock_transport *t)

{

	int retval = mutex_lock_interruptible(&vsock_register_mutex);

	if (retval)

		return retval;



	if (transport) {

		retval = -EBUSY;

		goto out;

	}



	transport = t;

	retval = __vsock_core_init();

	if (retval)

	transport = NULL;



out:

err_busy:

	mutex_unlock(&vsock_register_mutex);

	return retval;

	return err;

}

EXPORT_SYMBOL_GPL(vsock_core_init);

EXPORT_SYMBOL_GPL(__vsock_core_init);



void vsock_core_exit(void)

{
@@ -2000,5 +1997,5 @@ EXPORT_SYMBOL_GPL(vsock_core_exit); 


MODULE_AUTHOR("VMware, Inc.");

MODULE_DESCRIPTION("VMware Virtual Socket Family");

MODULE_VERSION("1.0.0.0-k");

MODULE_VERSION("1.0.1.0-k");

MODULE_LICENSE("GPL v2");