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    Subject[PATCH 01/11] ALSA: vsnd: Implement driver's probe/remove
    Date
    From: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>

    Add essential driver private info structure, initialize
    locks and implement probe/remove of the Xen frontend
    driver.

    Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
    ---
    sound/drivers/xen-front.c | 27 +++++++++++++++++++++++++++
    1 file changed, 27 insertions(+)

    diff --git a/sound/drivers/xen-front.c b/sound/drivers/xen-front.c
    index 61779c36cae3..8c5de7b0e7b5 100644
    --- a/sound/drivers/xen-front.c
    +++ b/sound/drivers/xen-front.c
    @@ -26,6 +26,16 @@

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

    +struct xdrv_info {
    + struct xenbus_device *xb_dev;
    + spinlock_t io_lock;
    + struct mutex mutex;
    +};
    +
    +static void xdrv_remove_internal(struct xdrv_info *drv_info)
    +{
    +}
    +
    static void xdrv_be_on_changed(struct xenbus_device *xb_dev,
    enum xenbus_state backend_state)
    {
    @@ -34,11 +44,28 @@ static void xdrv_be_on_changed(struct xenbus_device *xb_dev,
    static int xdrv_probe(struct xenbus_device *xb_dev,
    const struct xenbus_device_id *id)
    {
    + struct xdrv_info *drv_info;
    +
    + drv_info = devm_kzalloc(&xb_dev->dev, sizeof(*drv_info), GFP_KERNEL);
    + if (!drv_info) {
    + xenbus_dev_fatal(xb_dev, -ENOMEM, "allocating device memory");
    + return -ENOMEM;
    + }
    +
    + drv_info->xb_dev = xb_dev;
    + spin_lock_init(&drv_info->io_lock);
    + mutex_init(&drv_info->mutex);
    + dev_set_drvdata(&xb_dev->dev, drv_info);
    return 0;
    }

    static int xdrv_remove(struct xenbus_device *dev)
    {
    + struct xdrv_info *drv_info = dev_get_drvdata(&dev->dev);
    +
    + mutex_lock(&drv_info->mutex);
    + xdrv_remove_internal(drv_info);
    + mutex_unlock(&drv_info->mutex);
    return 0;
    }

    --
    2.7.4
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