From 9be07334f99e1f9e0b244d73528bc3afce126735 Mon Sep 17 00:00:00 2001 From: Stefano Stabellini Date: Wed, 5 Jul 2017 13:08:48 -0700 Subject: [PATCH] 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: Stefano Stabellini Reviewed-by: Boris Ostrovsky Reviewed-by: Juergen Gross CC: boris.ostrovsky@oracle.com CC: jgross@suse.com Signed-off-by: Boris Ostrovsky --- drivers/xen/pvcalls-back.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c index f3d0daad3da6..9044cf21b31c 100644 --- a/drivers/xen/pvcalls-back.c +++ b/drivers/xen/pvcalls-back.c @@ -25,6 +25,11 @@ #include #include +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); -- 2.20.1