I'm not against this patch, but I don't see a lot of meaning in it either,
apart from the .irq part - that makes the type match *request_*irq()
prototypes. Apart from that... Using "int i" for a simple iterator, that
doesn't go beyond INT_MAX is kinda traditional, I think. You change int
frame to unsigned, but if you look at mcam_buffer_done(), as it is called
from mcam_frame_tasklet(), the
int bufno = cam->next_buf;
variable is used for its second parameter (int frame). And ->next_buf is
declared as (signed) int, and can indeed be negative in
mcam_reset_buffers():
cam->next_buf = -1;
So... You might need to be more careful with those changes, if you
_really_ need them. Otherwise, unless there are real reasons, like
matching an existing API, avoiding warnings, I'd really just drop all
this, perhaps, apart from ->irq.
Thanks
Guennadi
On Thu, 7 Feb 2013, Albert Wang wrote:
> This patch uses unsigned int type replace int type in marvell-ccic.
> These variables: frame number, buf number, irq... should be unsigned.
>
> Signed-off-by: Albert Wang <twang13@xxxxxxxxxxx>
> Signed-off-by: Libin Yang <lbyang@xxxxxxxxxxx>
> Acked-by: Jonathan Corbet <corbet@xxxxxxx>
> ---
> drivers/media/platform/marvell-ccic/mcam-core.c | 22 +++++++++++-----------
> drivers/media/platform/marvell-ccic/mcam-core.h | 2 +-
> drivers/media/platform/marvell-ccic/mmp-driver.c | 2 +-
> 3 files changed, 13 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/media/platform/marvell-ccic/mcam-core.c b/drivers/media/platform/marvell-ccic/mcam-core.c
> index 939c430..b668f2b 100755
> --- a/drivers/media/platform/marvell-ccic/mcam-core.c
> +++ b/drivers/media/platform/marvell-ccic/mcam-core.c
> @@ -233,7 +233,7 @@ static inline struct mcam_vb_buffer *vb_to_mvb(struct vb2_buffer *vb)
> /*
> * Hand a completed buffer back to user space.
> */
> -static void mcam_buffer_done(struct mcam_camera *cam, int frame,
> +static void mcam_buffer_done(struct mcam_camera *cam, unsigned int frame,
> struct vb2_buffer *vbuf)
> {
> vbuf->v4l2_buf.bytesused = cam->pix_format.sizeimage;
> @@ -260,7 +260,7 @@ static void mcam_buffer_done(struct mcam_camera *cam, int frame,
> */
> static void mcam_reset_buffers(struct mcam_camera *cam)
> {
> - int i;
> + unsigned int i;
>
> cam->next_buf = -1;
> for (i = 0; i < cam->nbufs; i++) {
> @@ -344,7 +344,7 @@ static int mcam_config_mipi(struct mcam_camera *mcam, int enable)
> */
> static int mcam_alloc_dma_bufs(struct mcam_camera *cam, int loadtime)
> {
> - int i;
> + unsigned int i;
>
> mcam_set_config_needed(cam, 1);
> if (loadtime)
> @@ -385,7 +385,7 @@ static int mcam_alloc_dma_bufs(struct mcam_camera *cam, int loadtime)
>
> static void mcam_free_dma_bufs(struct mcam_camera *cam)
> {
> - int i;
> + unsigned int i;
>
> for (i = 0; i < cam->nbufs; i++) {
> dma_free_coherent(cam->dev, cam->dma_buf_size,
> @@ -424,7 +424,7 @@ static void mcam_ctlr_dma_vmalloc(struct mcam_camera *cam)
> static void mcam_frame_tasklet(unsigned long data)
> {
> struct mcam_camera *cam = (struct mcam_camera *) data;
> - int i;
> + unsigned int i;
> unsigned long flags;
> struct mcam_vb_buffer *buf;
>
> @@ -472,7 +472,7 @@ static int mcam_check_dma_buffers(struct mcam_camera *cam)
> return 0;
> }
>
> -static void mcam_vmalloc_done(struct mcam_camera *cam, int frame)
> +static void mcam_vmalloc_done(struct mcam_camera *cam, unsigned int frame)
> {
> tasklet_schedule(&cam->s_tasklet);
> }
> @@ -521,7 +521,7 @@ static bool mcam_fmt_is_planar(__u32 pfmt)
> * space. In this way, we always have a buffer to DMA to and don't
> * have to try to play games stopping and restarting the controller.
> */
> -static void mcam_set_contig_buffer(struct mcam_camera *cam, int frame)
> +static void mcam_set_contig_buffer(struct mcam_camera *cam, unsigned int frame)
> {
> struct mcam_vb_buffer *buf;
> struct v4l2_pix_format *fmt = &cam->pix_format;
> @@ -567,7 +567,7 @@ static void mcam_ctlr_dma_contig(struct mcam_camera *cam)
> /*
> * Frame completion handling.
> */
> -static void mcam_dma_contig_done(struct mcam_camera *cam, int frame)
> +static void mcam_dma_contig_done(struct mcam_camera *cam, unsigned int frame)
> {
> struct mcam_vb_buffer *buf = cam->vb_bufs[frame];
>
> @@ -643,7 +643,7 @@ static void mcam_ctlr_dma_sg(struct mcam_camera *cam)
> * safely change the DMA descriptor array here and restart things
> * (assuming there's another buffer waiting to go).
> */
> -static void mcam_dma_sg_done(struct mcam_camera *cam, int frame)
> +static void mcam_dma_sg_done(struct mcam_camera *cam, unsigned int frame)
> {
> struct mcam_vb_buffer *buf = cam->vb_bufs[0];
>
> @@ -1051,7 +1051,7 @@ static int mcam_vb_queue_setup(struct vb2_queue *vq,
> void *alloc_ctxs[])
> {
> struct mcam_camera *cam = vb2_get_drv_priv(vq);
> - int minbufs = (cam->buffer_mode == B_DMA_CONTIG) ? 3 : 2;
> + unsigned int minbufs = (cam->buffer_mode == B_DMA_CONTIG) ? 3 : 2;
>
> sizes[0] = cam->pix_format.sizeimage;
> *num_planes = 1; /* Someday we have to support planar formats... */
> @@ -1855,7 +1855,7 @@ static struct video_device mcam_v4l_template = {
> /*
> * Interrupt handler stuff
> */
> -static void mcam_frame_complete(struct mcam_camera *cam, int frame)
> +static void mcam_frame_complete(struct mcam_camera *cam, unsigned int frame)
> {
> /*
> * Basic frame housekeeping.
> diff --git a/drivers/media/platform/marvell-ccic/mcam-core.h b/drivers/media/platform/marvell-ccic/mcam-core.h
> index 263767e..4cb68e0 100755
> --- a/drivers/media/platform/marvell-ccic/mcam-core.h
> +++ b/drivers/media/platform/marvell-ccic/mcam-core.h
> @@ -163,7 +163,7 @@ struct mcam_camera {
>
> /* Mode-specific ops, set at open time */
> void (*dma_setup)(struct mcam_camera *cam);
> - void (*frame_complete)(struct mcam_camera *cam, int frame);
> + void (*frame_complete)(struct mcam_camera *cam, unsigned int frame);
>
> /* Current operating parameters */
> u32 sensor_type; /* Currently ov7670 only */
> diff --git a/drivers/media/platform/marvell-ccic/mmp-driver.c b/drivers/media/platform/marvell-ccic/mmp-driver.c
> index 89dd078..732af16 100755
> --- a/drivers/media/platform/marvell-ccic/mmp-driver.c
> +++ b/drivers/media/platform/marvell-ccic/mmp-driver.c
> @@ -42,7 +42,7 @@ struct mmp_camera {
> struct platform_device *pdev;
> struct mcam_camera mcam;
> struct list_head devlist;
> - int irq;
> + unsigned int irq;
> };
>
> static inline struct mmp_camera *mcam_to_cam(struct mcam_camera *mcam)
> --
> 1.7.9.5
>
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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