On Fri, 23 Nov 2012, Albert Wang wrote:
> This patch use unsigned int type replace int type in marvell-ccic.
>
> These variables: frame number, buf number, irq... should be unsigned.
Several issues to be considered here:
* most these variables will never take values > INT_MAX, so, this isn't
very important
* sometimes it is convenient to use a variable, that normally should only
take positive values, to also check for negative values. These variables
should be signed.
* compile-time compatibility: if variables are used as arguments of
functions or are compared or assigned to other variables, their types
should be compatible.
* my "old" cross-compiler was hiding many such problems, I'm sure at
marvell you use new enough compilers to warn you about any such
issues:-)
So, mainly, just make sure you get no compiler warnings, otherwise it's
not very important, IMHO.
Thanks
Guennadi
>
> Signed-off-by: Albert Wang <twan...@marvell.com>
> ---
> .../media/platform/marvell-ccic/mcam-core-soc.h | 2 +-
> .../platform/marvell-ccic/mcam-core-standard.h | 10 ++++-----
> 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 +-
> 5 files changed, 19 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/media/platform/marvell-ccic/mcam-core-soc.h
> b/drivers/media/platform/marvell-ccic/mcam-core-soc.h
> index a5b5fa6..bff8b2a 100644
> --- a/drivers/media/platform/marvell-ccic/mcam-core-soc.h
> +++ b/drivers/media/platform/marvell-ccic/mcam-core-soc.h
> @@ -11,7 +11,7 @@ extern const struct vb2_ops mcam_soc_vb2_ops;
>
> extern void mcam_ctlr_power_up(struct mcam_camera *cam);
> extern void mcam_ctlr_power_down(struct mcam_camera *cam);
> -extern void mcam_dma_contig_done(struct mcam_camera *cam, int frame);
> +extern void mcam_dma_contig_done(struct mcam_camera *cam, unsigned int
> frame);
> extern void mcam_ctlr_stop(struct mcam_camera *cam);
> extern int mcam_config_mipi(struct mcam_camera *mcam, int enable);
> extern void mcam_ctlr_image(struct mcam_camera *cam);
> diff --git a/drivers/media/platform/marvell-ccic/mcam-core-standard.h
> b/drivers/media/platform/marvell-ccic/mcam-core-standard.h
> index 148a1a1..090c1a2 100644
> --- a/drivers/media/platform/marvell-ccic/mcam-core-standard.h
> +++ b/drivers/media/platform/marvell-ccic/mcam-core-standard.h
> @@ -4,8 +4,8 @@
> * Copyright 2011 Jonathan Corbet cor...@lwn.net
> */
> extern bool alloc_bufs_at_read;
> -extern int n_dma_bufs;
> -extern int buffer_mode;
> +extern unsigned int n_dma_bufs;
> +extern unsigned int buffer_mode;
> extern const struct vb2_ops mcam_vb2_sg_ops;
> extern const struct vb2_ops mcam_vb2_ops;
>
> @@ -17,12 +17,12 @@ extern void mcam_ctlr_init(struct mcam_camera *cam);
> extern int mcam_cam_init(struct mcam_camera *cam);
> extern void mcam_free_dma_bufs(struct mcam_camera *cam);
> extern void mcam_ctlr_dma_sg(struct mcam_camera *cam);
> -extern void mcam_dma_sg_done(struct mcam_camera *cam, int frame);
> +extern void mcam_dma_sg_done(struct mcam_camera *cam, unsigned int frame);
> extern int mcam_check_dma_buffers(struct mcam_camera *cam);
> extern void mcam_set_config_needed(struct mcam_camera *cam, int needed);
> extern int __mcam_cam_reset(struct mcam_camera *cam);
> extern int mcam_alloc_dma_bufs(struct mcam_camera *cam, int loadtime);
> extern void mcam_ctlr_dma_contig(struct mcam_camera *cam);
> -extern void mcam_dma_contig_done(struct mcam_camera *cam, int frame);
> +extern void mcam_dma_contig_done(struct mcam_camera *cam, unsigned int
> frame);
> extern void mcam_ctlr_dma_vmalloc(struct mcam_camera *cam);
> -extern void mcam_vmalloc_done(struct mcam_camera *cam, int frame);
> +extern void mcam_vmalloc_done(struct mcam_camera *cam, unsigned int frame);
> diff --git a/drivers/media/platform/marvell-ccic/mcam-core.c
> b/drivers/media/platform/marvell-ccic/mcam-core.c
> index 3b05d8c..2d200d6 100755
> --- a/drivers/media/platform/marvell-ccic/mcam-core.c
> +++ b/drivers/media/platform/marvell-ccic/mcam-core.c
> @@ -111,7 +111,7 @@ 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;
> @@ -125,7 +125,7 @@ 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++) {
> @@ -216,7 +216,7 @@ int mcam_config_mipi(struct mcam_camera *mcam, int enable)
> */
> int mcam_alloc_dma_bufs(struct mcam_camera *cam, int loadtime)
> {
> - int i;
> + unsigned int i;
>
> mcam_set_config_needed(cam, 1);
> if (loadtime)
> @@ -257,7 +257,7 @@ int mcam_alloc_dma_bufs(struct mcam_camera *cam, int
> loadtime)
>
> 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,
> @@ -296,7 +296,7 @@ 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;
>
> @@ -344,7 +344,7 @@ int mcam_check_dma_buffers(struct mcam_camera *cam)
> return 0;
> }
>
> -void mcam_vmalloc_done(struct mcam_camera *cam, int frame)
> +void mcam_vmalloc_done(struct mcam_camera *cam, unsigned int frame)
> {
> tasklet_schedule(&cam->s_tasklet);
> }
> @@ -396,7 +396,7 @@ 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;
> @@ -442,7 +442,7 @@ void mcam_ctlr_dma_contig(struct mcam_camera *cam)
> /*
> * Frame completion handling.
> */
> -void mcam_dma_contig_done(struct mcam_camera *cam, int frame)
> +void mcam_dma_contig_done(struct mcam_camera *cam, unsigned int frame)
> {
> struct mcam_vb_buffer *buf = cam->vb_bufs[frame];
>
> @@ -518,7 +518,7 @@ 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).
> */
> -void mcam_dma_sg_done(struct mcam_camera *cam, int frame)
> +void mcam_dma_sg_done(struct mcam_camera *cam, unsigned int frame)
> {
> struct mcam_vb_buffer *buf = cam->vb_bufs[0];
>
> @@ -935,7 +935,7 @@ static int mcam_vb_queue_setup(struct vb2_queue *vq,
> void *alloc_ctxs[])
> {
> struct mcam_camera *cam = get_mcam(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... */
> @@ -1207,7 +1207,7 @@ const struct vb2_ops mcam_soc_vb2_ops = {
> /*
> * 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 999b581..5b2cf6e 100755
> --- a/drivers/media/platform/marvell-ccic/mcam-core.h
> +++ b/drivers/media/platform/marvell-ccic/mcam-core.h
> @@ -197,7 +197,7 @@ 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 e840941..9b631b7 100755
> --- a/drivers/media/platform/marvell-ccic/mmp-driver.c
> +++ b/drivers/media/platform/marvell-ccic/mmp-driver.c
> @@ -52,7 +52,7 @@ struct mmp_camera {
> struct list_head devlist;
> /* will change here */
> struct clk *clk[3]; /* CCIC_GATE, CCIC_RST, CCIC_DBG clocks */
> - 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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