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SubjectRe: [PATCH 10/33] fbcon: call fbcon_fb_(un)registered directly
From
Date
Hi

Am 20.05.19 um 10:21 schrieb Daniel Vetter:
...
> diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
> index fc3d34a8ea5b..ae2db31eeba7 100644
> --- a/drivers/video/fbdev/core/fbmem.c
> +++ b/drivers/video/fbdev/core/fbmem.c
> @@ -1660,7 +1660,6 @@ MODULE_PARM_DESC(lockless_register_fb,
> static int do_register_framebuffer(struct fb_info *fb_info)
> {
> int i, ret;
> - struct fb_event event;
> struct fb_videomode mode;
>
> if (fb_check_foreignness(fb_info))
> @@ -1723,7 +1722,6 @@ static int do_register_framebuffer(struct fb_info *fb_info)
> fb_add_videomode(&mode, &fb_info->modelist);
> registered_fb[i] = fb_info;
>
> - event.info = fb_info;
> if (!lockless_register_fb)
> console_lock();
> else
> @@ -1732,9 +1730,8 @@ static int do_register_framebuffer(struct fb_info *fb_info)
> ret = -ENODEV;
> goto unlock_console;
> }
> - ret = 0;
>
> - fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
> + ret = fbcon_fb_registered(fb_info);

What about backlight drivers? [1] Apparently these also use the
notifiers. [2] From my understanding, backlight drivers would stop
working with this change.

Best regards
Thomas

[1]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/video/backlight
[2]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/video/backlight/backlight.c#n40

> unlock_fb_info(fb_info);
> unlock_console:
> if (!lockless_register_fb)
> @@ -1771,7 +1768,6 @@ static int __unlink_framebuffer(struct fb_info *fb_info);
>
> static int do_unregister_framebuffer(struct fb_info *fb_info)
> {
> - struct fb_event event;
> int ret;
>
> ret = unbind_console(fb_info);
> @@ -1789,9 +1785,8 @@ static int do_unregister_framebuffer(struct fb_info *fb_info)
> registered_fb[fb_info->node] = NULL;
> num_registered_fb--;
> fb_cleanup_device(fb_info);
> - event.info = fb_info;
> console_lock();
> - fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
> + fbcon_fb_unregistered(fb_info);
> console_unlock();
>
> /* this may free fb info */
> diff --git a/include/linux/fb.h b/include/linux/fb.h
> index f52ef0ad6781..701abaf79c87 100644
> --- a/include/linux/fb.h
> +++ b/include/linux/fb.h
> @@ -136,10 +136,6 @@ struct fb_cursor_user {
> #define FB_EVENT_RESUME 0x03
> /* An entry from the modelist was removed */
> #define FB_EVENT_MODE_DELETE 0x04
> -/* A driver registered itself */
> -#define FB_EVENT_FB_REGISTERED 0x05
> -/* A driver unregistered itself */
> -#define FB_EVENT_FB_UNREGISTERED 0x06
> /* CONSOLE-SPECIFIC: get console to framebuffer mapping */
> #define FB_EVENT_GET_CONSOLE_MAP 0x07
> /* CONSOLE-SPECIFIC: set console to framebuffer mapping */
> diff --git a/include/linux/fbcon.h b/include/linux/fbcon.h
> index f68a7db14165..94a71e9e1257 100644
> --- a/include/linux/fbcon.h
> +++ b/include/linux/fbcon.h
> @@ -4,9 +4,13 @@
> #ifdef CONFIG_FRAMEBUFFER_CONSOLE
> void __init fb_console_init(void);
> void __exit fb_console_exit(void);
> +int fbcon_fb_registered(struct fb_info *info);
> +void fbcon_fb_unregistered(struct fb_info *info);
> #else
> static inline void fb_console_init(void) {}
> static inline void fb_console_exit(void) {}
> +static inline int fbcon_fb_registered(struct fb_info *info) { return 0; }
> +static inline void fbcon_fb_unregistered(struct fb_info *info) {}
> #endif
>
> #endif /* _LINUX_FBCON_H */
>

--
Thomas Zimmermann
Graphics Driver Developer
SUSE Linux GmbH, Maxfeldstrasse 5, 90409 Nuernberg, Germany
GF: Felix Imendörffer, Mary Higgins, Sri Rasiah
HRB 21284 (AG Nürnberg)

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