diff mbox series

[v5,03/15] device property: Return true in fwnode_device_is_available for NULL ops

Message ID 20210107132838.396641-4-djrscally@gmail.com
State Accepted
Commit 5273382d03763277aaf8c6a2d6088e2afaee0cf0
Headers show
Series None | expand

Commit Message

Daniel Scally Jan. 7, 2021, 1:28 p.m. UTC 
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 v5:

	- Changed the commit subject

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

Comments

Greg KH Jan. 10, 2021, 3:09 p.m. UTC | #1 
On Thu, Jan 07, 2021 at 01:28:26PM +0000, Daniel Scally wrote:
> 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 v5:
> 
> 	- Changed the commit subject
> 

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff mbox series

Patch

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 35b95c6ac0c6..0bf5260f14c6 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -837,9 +837,15 @@  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);