linux-kernel - [PATCH v2 3/3] media: vb2-core: vb2_ops: document non-interrupt-context calling

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Date:   Thu,  8 Mar 2018 13:26:22 +0100
From:   Luca Ceresoli <luca@...aceresoli.net>
To:     linux-media@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Luca Ceresoli <luca@...aceresoli.net>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Pawel Osciak <pawel@...iak.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Subject: [PATCH v2 3/3] media: vb2-core: vb2_ops: document non-interrupt-context calling

Driver writers can benefit in knowing if/when callbacks are called in
interrupt context. But it is not completely obvious here, so document
it.

Signed-off-by: Luca Ceresoli <luca@...aceresoli.net>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Pawel Osciak <pawel@...iak.com>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Kyungmin Park <kyungmin.park@...sung.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>

---
Changes v1 -> v2:
 - Fix typo in the title.
---
 include/media/videobuf2-core.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index f20000887d3c..f6818f732f34 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -296,6 +296,9 @@ struct vb2_buffer {
 /**
  * struct vb2_ops - driver-specific callbacks.
  *
+ * These operations are not called from interrupt context except where
+ * mentioned specifically.
+ *
  * @queue_setup:	called from VIDIOC_REQBUFS() and VIDIOC_CREATE_BUFS()
  *			handlers before memory allocation. It can be called
  *			twice: if the original number of requested buffers
-- 
2.7.4