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    Subject[PATCH v7 03/18] xen/pvcalls: initialize the module and register the xenbus backend
    Date
    Keep a list of connected frontends. Use a semaphore to protect list
    accesses.

    Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
    Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
    Reviewed-by: Juergen Gross <jgross@suse.com>
    CC: boris.ostrovsky@oracle.com
    CC: jgross@suse.com
    ---
    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 f3d0daa..9044cf2 100644
    --- a/drivers/xen/pvcalls-back.c
    +++ b/drivers/xen/pvcalls-back.c
    @@ -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 int pvcalls_back_uevent(struct xenbus_device *xdev,
    .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);
    --
    1.9.1
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