Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Daniel Scally <djrscally@gmail.com>
To:     linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
        linux-media@vger.kernel.org, devel@acpica.org,
        gregkh@linuxfoundation.org, rjw@rjwysocki.net,
        sergey.senozhatsky@gmail.com, mchehab@kernel.org
Cc:     lenb@kernel.org, yong.zhi@intel.com, sakari.ailus@linux.intel.com,
        bingbu.cao@intel.com, tian.shu.qiu@intel.com,
        robert.moore@intel.com, erik.kaneda@intel.com, pmladek@suse.com,
        rostedt@goodmis.org, andriy.shevchenko@linux.intel.com,
        linux@rasmusvillemoes.dk,
        laurent.pinchart+renesas@ideasonboard.com,
        jacopo+renesas@jmondi.org, kieran.bingham+renesas@ideasonboard.com,
        hverkuil-cisco@xs4all.nl, m.felsch@pengutronix.de,
        niklas.soderlund+renesas@ragnatech.se, slongerbeam@gmail.com,
        heikki.krogerus@linux.intel.com, linus.walleij@linaro.org,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Subject: [PATCH v4 03/15] property: Return true in fwnode_device_is_available for NULL ops
Date:   Sun,  3 Jan 2021 23:12:23 +0000
Message-Id: <20210103231235.792999-4-djrscally@gmail.com>
In-Reply-To: <20210103231235.792999-1-djrscally@gmail.com>
References: <20210103231235.792999-1-djrscally@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Some types of fwnode_handle do not implement the device_is_available()
check, such as those created by software_nodes. There isn't really a
meaningful way to check for the availability of a device that doesn't
actually exist, so if the check isn't implemented just assume that the
"device" is present.

Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Daniel Scally <djrscally@gmail.com>
---
Changes in v4:

	- None

 drivers/base/property.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 4c43d30145c6..bc9c634df6df 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -785,9 +785,15 @@ EXPORT_SYMBOL_GPL(fwnode_handle_put);
 /**
  * fwnode_device_is_available - check if a device is available for use
  * @fwnode: Pointer to the fwnode of the device.
+ *
+ * For fwnode node types that don't implement the .device_is_available()
+ * operation, this function returns true.
  */
 bool fwnode_device_is_available(const struct fwnode_handle *fwnode)
 {
+	if (!fwnode_has_op(fwnode, device_is_available))
+		return true;
+
 	return fwnode_call_bool_op(fwnode, device_is_available);
 }
 EXPORT_SYMBOL_GPL(fwnode_device_is_available);
-- 
2.25.1