linux-kernel - [PATCH 5/6] staging: bcm2835-camera: constify vb2

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Date:   Sat,  5 Aug 2017 12:47:12 +0200
From:   Julia Lawall <Julia.Lawall@...6.fr>
To:     Eric Anholt <eric@...olt.net>
Cc:     bhumirks@...il.com, kernel-janitors@...r.kernel.org,
        Stefan Wahren <stefan.wahren@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 5/6] staging: bcm2835-camera: constify vb2_ops structures

These vb2_ops structures are only stored in the ops field of a
vb2_queue structure, which is declared as const.  Thus the vb2_ops
structures themselves can be const.

Done with the help of Coccinelle.

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@
static struct vb2_ops i@p = { ... };

@ok@
identifier r.i;
struct vb2_queue e;
position p;
@@
e.ops = &i@p;

@bad@
position p != {r.p,ok.p};
identifier r.i;
struct vb2_ops e;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
 struct vb2_ops i = { ... };
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
index a11e047..5af758a 100644
--- a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
@@ -642,7 +642,7 @@ static void bm2835_mmal_unlock(struct vb2_queue *vq)
 	mutex_unlock(&dev->mutex);
 }
 
-static struct vb2_ops bm2835_mmal_video_qops = {
+static const struct vb2_ops bm2835_mmal_video_qops = {
 	.queue_setup = queue_setup,
 	.buf_prepare = buffer_prepare,
 	.buf_queue = buffer_queue,