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Commit 9be07334 authored by Stefano Stabellini's avatar Stefano Stabellini Committed by Boris Ostrovsky
Browse files

xen/pvcalls: initialize the module and register the xenbus backend 



Keep a list of connected frontends. Use a semaphore to protect list
accesses.

Signed-off-by: default avatarStefano Stabellini <stefano@aporeto.com>
Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: default avatarJuergen Gross <jgross@suse.com>
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
Signed-off-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
parent 72e59c30

drivers/xen/pvcalls-back.c

+22 −0
Original line number Diff line number Diff line
@@ -25,6 +25,11 @@ 
#include <xen/xenbus.h>

#include <xen/interface/io/pvcalls.h>



struct pvcalls_back_global {

	struct list_head frontends;

	struct semaphore frontends_lock;

} pvcalls_back_global;



static int pvcalls_back_probe(struct xenbus_device *dev,

			      const struct xenbus_device_id *id)

{
@@ -59,3 +64,20 @@ static struct xenbus_driver pvcalls_back_driver = { 
	.uevent = pvcalls_back_uevent,

	.otherend_changed = pvcalls_back_changed,

};



static int __init pvcalls_back_init(void)

{

	int ret;



	if (!xen_domain())

		return -ENODEV;



	ret = xenbus_register_backend(&pvcalls_back_driver);

	if (ret < 0)

		return ret;



	sema_init(&pvcalls_back_global.frontends_lock, 1);

	INIT_LIST_HEAD(&pvcalls_back_global.frontends);

	return 0;

}

module_init(pvcalls_back_init);