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Subject: media: docs-rst: Document EBUSY for VIDIOC_S_FMT
Author:  Sakari Ailus <>
Date:    Mon Jun 26 06:26:24 2017 -0300

VIDIOC_S_FMT may return EBUSY if the device is streaming or there are
buffers allocated. Document this.

Signed-off-by: Sakari Ailus <>
Acked-by: Hans Verkuil <>
Signed-off-by: Mauro Carvalho Chehab <>

 Documentation/media/uapi/v4l/vidioc-g-fmt.rst | 6 ++++++
 1 file changed, 6 insertions(+)


diff --git a/Documentation/media/uapi/v4l/vidioc-g-fmt.rst 
index b853e48312e2..d082f9a21548 100644
--- a/Documentation/media/uapi/v4l/vidioc-g-fmt.rst
+++ b/Documentation/media/uapi/v4l/vidioc-g-fmt.rst
@@ -147,3 +147,9 @@ appropriately. The generic error codes are described at the
     The struct :c:type:`v4l2_format` ``type`` field is
     invalid or the requested buffer type not supported.
+    The device is busy and cannot change the format. This could be
+    because or the device is streaming or buffers are allocated or
+    queued to the driver. Relevant for :ref:`VIDIOC_S_FMT
+    <VIDIOC_G_FMT>` only.

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