From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752664AbdHGHqZ (ORCPT ); Mon, 7 Aug 2017 03:46:25 -0400 Received: from mail-lf0-f68.google.com ([209.85.215.68]:35204 "EHLO mail-lf0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751377AbdHGHnh (ORCPT ); Mon, 7 Aug 2017 03:43:37 -0400 From: Oleksandr Andrushchenko To: alsa-devel@alsa-project.org, xen-devel@lists.xen.org, linux-kernel@vger.kernel.org Cc: perex@perex.cz, tiwai@suse.com, andr2000@gmail.com, Oleksandr Andrushchenko Subject: [PATCH 01/11] ALSA: vsnd: Implement driver's probe/remove Date: Mon, 7 Aug 2017 10:43:06 +0300 Message-Id: <1502091796-14413-2-git-send-email-andr2000@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1502091796-14413-1-git-send-email-andr2000@gmail.com> References: <1502091796-14413-1-git-send-email-andr2000@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Oleksandr Andrushchenko Add essential driver private info structure, initialize locks and implement probe/remove of the Xen frontend driver. Signed-off-by: Oleksandr Andrushchenko --- 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 +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