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[PATCH RESEND 01/11] ALSA: vsnd: Implement driver's probe/remove

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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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[PATCH RESEND 00/11] ALSA: vsnd: Add Xen para-virtualized frontend driver Oleksandr Andrushchenko <andr2000@gmail.com> - 2017-08-07 14:00 +0200
  [PATCH RESEND 07/11] ALSA: vsnd: Initialize virtul sound card Oleksandr Andrushchenko <andr2000@gmail.com> - 2017-08-07 14:00 +0200
  [PATCH RESEND 04/11] ALSA: vsnd: Implement Xen event channel handling Oleksandr Andrushchenko <andr2000@gmail.com> - 2017-08-07 14:00 +0200
  [PATCH RESEND 06/11] ALSA: vsnd: Introduce ALSA virtual sound driver Oleksandr Andrushchenko <andr2000@gmail.com> - 2017-08-07 14:00 +0200
  [PATCH RESEND 02/11] ALSA: vsnd: Implement Xen bus state handling Oleksandr Andrushchenko <andr2000@gmail.com> - 2017-08-07 14:00 +0200
  [PATCH RESEND 01/11] ALSA: vsnd: Implement driver's probe/remove Oleksandr Andrushchenko <andr2000@gmail.com> - 2017-08-07 14:00 +0200
  [PATCH RESEND 11/11] ALSA: vsnd: Introduce Kconfig option to enable Xen PV sound Oleksandr Andrushchenko <andr2000@gmail.com> - 2017-08-07 14:00 +0200
  [PATCH RESEND 09/11] ALSA: vsnd: Implement ALSA PCM operations Oleksandr Andrushchenko <andr2000@gmail.com> - 2017-08-07 14:00 +0200
  [PATCH RESEND 03/11] ALSA: vsnd: Read sound driver configuration from Xen store Oleksandr Andrushchenko <andr2000@gmail.com> - 2017-08-07 14:00 +0200
  [PATCH RESEND 05/11] ALSA: vsnd: Implement handling of shared buffers Oleksandr Andrushchenko <andr2000@gmail.com> - 2017-08-07 14:00 +0200
  [PATCH RESEND 10/11] ALSA: vsnd: Implement communication with backend Oleksandr Andrushchenko <andr2000@gmail.com> - 2017-08-07 14:00 +0200
  Re: [PATCH RESEND 00/11] ALSA: vsnd: Add Xen para-virtualized  frontend driver Takashi Sakamoto <o-takashi@sakamocchi.jp> - 2017-08-07 14:10 +0200
    Re: [PATCH RESEND 00/11] ALSA: vsnd: Add Xen para-virtualized  frontend driver Oleksandr Andrushchenko <andr2000@gmail.com> - 2017-08-07 14:20 +0200
      Re: [PATCH RESEND 00/11] ALSA: vsnd: Add Xen para-virtualized  frontend driver Takashi Sakamoto <o-takashi@sakamocchi.jp> - 2017-08-07 14:40 +0200
        Re: [PATCH RESEND 00/11] ALSA: vsnd: Add Xen para-virtualized  frontend driver Oleksandr Andrushchenko <andr2000@gmail.com> - 2017-08-07 14:40 +0200

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