linux-kernel - [PATCH v2 2/3] media: uapi: Document IOCTL number assignment

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Message-Id: <20250527055648.503884-3-sakari.ailus@linux.intel.com>
Date: Tue, 27 May 2025 08:56:47 +0300
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: linux-doc@...r.kernel.org
Cc: Jonathan Corbet <corbet@....net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Haren Myneni <haren@...ux.ibm.com>,
	Bagas Sanjaya <bagasdotme@...il.com>,
	Andrew Donnellan <ajd@...ux.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Akshay Gupta <akshay.gupta@....com>,
	linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org,
	hans@...erkuil.nl,
	laurent.pinchart@...asonboard.com,
	Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
	Lee Jones <lee@...nel.org>
Subject: [PATCH v2 2/3] media: uapi: Document IOCTL number assignment

Document MC IOCTL number assignment in linux/media.h. In the past the
assignment up to 0x7f was missed so to prevent that from happening again,
document the value here as well.

Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
---
 include/uapi/linux/media.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/uapi/linux/media.h b/include/uapi/linux/media.h
index 1c80b1d6bbaf..2808132fcf49 100644
--- a/include/uapi/linux/media.h
+++ b/include/uapi/linux/media.h
@@ -381,6 +381,10 @@ struct media_v2_topology {
  */
 #define MEDIA_REQUEST_IOC_QUEUE		_IO('|',  0x80)
 #define MEDIA_REQUEST_IOC_REINIT	_IO('|',  0x81)
+/*
+ * Don't allocate new IOCTL numbers past 0x8f, MC IOCTL number assignment ends
+ * there!
+ */
 
 #ifndef __KERNEL__
 
-- 
2.39.5