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SubjectRe: [PATCH v2 fbdev-for-next 1/2] fbcon: introduce for_each_registered_fb() helper
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On Sat, 2018-06-30 at 15:29 +0800, Yisheng Xie wrote:
> Following pattern is often used:
>
> for (i = 0; i < FB_MAX; i++) {
> if (registered_fb[i]) {
> ...
> }
> }
>
> Therefore, as Andy's suggestion, for_each_registered_fb() helper can
> be introduced to make the code easier to read and write by reducing
> indentation level. It also saves few lines of code in each occurrence.
>
> This patch convert all part here at the same time.
>

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

> Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Signed-off-by: Yisheng Xie <ysxie@foxmail.com>
> ---
> v2:
> - rebase it to fbdev-for-next branch and add one more loop to replace
> - per Hans
> - Macro should be protected against nested conditionals. - per Andy
> drivers/video/fbdev/core/fbcon.c | 31 +++++++++++--------------------
> drivers/video/fbdev/core/fbmem.c | 4 +---
> include/linux/fb.h | 4 ++++
> 3 files changed, 16 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/video/fbdev/core/fbcon.c
> b/drivers/video/fbdev/core/fbcon.c
> index 5fb156b..e30d3a1 100644
> --- a/drivers/video/fbdev/core/fbcon.c
> +++ b/drivers/video/fbdev/core/fbcon.c
> @@ -2234,8 +2234,8 @@ static int fbcon_switch(struct vc_data *vc)
> *
> * info->currcon = vc->vc_num;
> */
> - for (i = 0; i < FB_MAX; i++) {
> - if (registered_fb[i] != NULL && registered_fb[i]-
> >fbcon_par) {
> + for_each_registered_fb(i) {
> + if (registered_fb[i]->fbcon_par) {
> struct fbcon_ops *o = registered_fb[i]-
> >fbcon_par;
>
> o->currcon = vc->vc_num;
> @@ -3124,11 +3124,9 @@ static int fbcon_fb_unregistered(struct fb_info
> *info)
> if (idx == info_idx) {
> info_idx = -1;
>
> - for (i = 0; i < FB_MAX; i++) {
> - if (registered_fb[i] != NULL) {
> - info_idx = i;
> - break;
> - }
> + for_each_registered_fb(i) {
> + info_idx = i;
> + break;
> }
> }
>
> @@ -3609,10 +3607,8 @@ static int fbcon_output_notifier(struct
> notifier_block *nb,
> deferred_takeover = false;
> logo_shown = FBCON_LOGO_DONTSHOW;
>
> - for (i = 0; i < FB_MAX; i++) {
> - if (registered_fb[i])
> - fbcon_fb_registered(registered_fb[i]);
> - }
> + for_each_registered_fb(i)
> + fbcon_fb_registered(registered_fb[i]);
>
> return NOTIFY_OK;
> }
> @@ -3638,11 +3634,9 @@ static void fbcon_start(void)
>
> console_lock();
>
> - for (i = 0; i < FB_MAX; i++) {
> - if (registered_fb[i] != NULL) {
> - info_idx = i;
> - break;
> - }
> + for_each_registered_fb(i) {
> + info_idx = i;
> + break;
> }
>
> do_fbcon_takeover(0);
> @@ -3669,15 +3663,12 @@ static void fbcon_exit(void)
> kfree((void *)softback_buf);
> softback_buf = 0UL;
>
> - for (i = 0; i < FB_MAX; i++) {
> + for_each_registered_fb(i) {
> int pending = 0;
>
> mapped = 0;
> info = registered_fb[i];
>
> - if (info == NULL)
> - continue;
> -
> if (info->queue.func)
> pending = cancel_work_sync(&info->queue);
> DPRINTK("fbcon: %s pending work\n", (pending ?
> "canceled" :
> diff --git a/drivers/video/fbdev/core/fbmem.c
> b/drivers/video/fbdev/core/fbmem.c
> index 609438d..645c6ac 100644
> --- a/drivers/video/fbdev/core/fbmem.c
> +++ b/drivers/video/fbdev/core/fbmem.c
> @@ -1593,10 +1593,8 @@ static int
> do_remove_conflicting_framebuffers(struct apertures_struct *a,
> int i, ret;
>
> /* check all firmware fbs and kick off if the base addr
> overlaps */
> - for (i = 0 ; i < FB_MAX; i++) {
> + for_each_registered_fb(i) {
> struct apertures_struct *gen_aper;
> - if (!registered_fb[i])
> - continue;
>
> if (!(registered_fb[i]->flags &
> FBINFO_MISC_FIRMWARE))
> continue;
> diff --git a/include/linux/fb.h b/include/linux/fb.h
> index aa74a22..fd31e6f 100644
> --- a/include/linux/fb.h
> +++ b/include/linux/fb.h
> @@ -650,6 +650,10 @@ extern int fb_get_color_depth(struct
> fb_var_screeninfo *var,
> extern int num_registered_fb;
> extern struct class *fb_class;
>
> +#define for_each_registered_fb(i) \
> + for (i = 0; i < FB_MAX; i++) \
> + if (!registered_fb[i]) {} else
> +
> extern int lock_fb_info(struct fb_info *info);
>
> static inline void unlock_fb_info(struct fb_info *info)

--
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Intel Finland Oy

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