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From: Sam Ravnborg <sam@ravnborg.org>
To: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Prarit Bhargava <prarit@redhat.com>,
	Kees Cook <keescook@chromium.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
	DRI Development <dri-devel@lists.freedesktop.org>,
	Yisheng Xie <ysxie@foxmail.com>,
	Hans de Goede <hdegoede@redhat.com>,
	Daniel Vetter <daniel.vetter@intel.com>,
	Konstantin Khorenko <khorenko@virtuozzo.com>
Subject: Re: [PATCH 09/33] fbcon: Remove fbcon_has_exited
Date: Sat, 25 May 2019 17:38:26 +0200	[thread overview]
Message-ID: <20190525153826.GA8661@ravnborg.org> (raw)
In-Reply-To: <20190524085354.27411-10-daniel.vetter@ffwll.ch>

Hi Daniel.

One detail I noticed while brosing the changes.

>  
> @@ -1064,9 +1062,13 @@ static void fbcon_init(struct vc_data *vc, int init)
>  	int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
>  	int cap, ret;
>  
> -	if (info_idx == -1 || info == NULL)
> +	if (WARN_ON(info_idx == -1))
>  	    return;
>  
> +	if (con2fb_map[vc->vc_num] == -1)
> +		con2fb_map[vc->vc_num] = info_idx;
> +
> +	info = registered_fb[con2fb_map[vc->vc_num]];
>  	cap = info->flags;

When info is defined it is also assigned:
struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];

As the test for info is gone this assignment is no longer
requrired and can be deleted.

The code now assumes that there is always an fb_info if con2fb_map[]
is not set to -1. I could not determine if this is OK, but this
likely boils down to your locking concern of registered_fb.

	Sam

>  
>  	if (logo_shown < 0 && console_loglevel <= CONSOLE_LOGLEVEL_QUIET)
> @@ -3336,14 +3338,6 @@ static int fbcon_event_notify(struct notifier_block *self,
>  	struct fb_blit_caps *caps;
>  	int idx, ret = 0;
>  
> -	/*
> -	 * ignore all events except driver registration and deregistration
> -	 * if fbcon is not active
> -	 */
> -	if (fbcon_has_exited && !(action == FB_EVENT_FB_REGISTERED ||
> -				  action == FB_EVENT_FB_UNREGISTERED))
> -		goto done;
> -
>  	switch(action) {
>  	case FB_EVENT_SUSPEND:
>  		fbcon_suspended(info);
> @@ -3396,7 +3390,6 @@ static int fbcon_event_notify(struct notifier_block *self,
>  		fbcon_remap_all(idx);
>  		break;
>  	}
> -done:
>  	return ret;
>  }
>  
> @@ -3443,9 +3436,6 @@ static ssize_t store_rotate(struct device *device,
>  	int rotate, idx;
>  	char **last = NULL;
>  
> -	if (fbcon_has_exited)
> -		return count;
> -
>  	console_lock();
>  	idx = con2fb_map[fg_console];
>  
> @@ -3468,9 +3458,6 @@ static ssize_t store_rotate_all(struct device *device,
>  	int rotate, idx;
>  	char **last = NULL;
>  
> -	if (fbcon_has_exited)
> -		return count;
> -
>  	console_lock();
>  	idx = con2fb_map[fg_console];
>  
> @@ -3491,9 +3478,6 @@ static ssize_t show_rotate(struct device *device,
>  	struct fb_info *info;
>  	int rotate = 0, idx;
>  
> -	if (fbcon_has_exited)
> -		return 0;
> -
>  	console_lock();
>  	idx = con2fb_map[fg_console];
>  
> @@ -3514,9 +3498,6 @@ static ssize_t show_cursor_blink(struct device *device,
>  	struct fbcon_ops *ops;
>  	int idx, blink = -1;
>  
> -	if (fbcon_has_exited)
> -		return 0;
> -
>  	console_lock();
>  	idx = con2fb_map[fg_console];
>  
> @@ -3543,9 +3524,6 @@ static ssize_t store_cursor_blink(struct device *device,
>  	int blink, idx;
>  	char **last = NULL;
>  
> -	if (fbcon_has_exited)
> -		return count;
> -
>  	console_lock();
>  	idx = con2fb_map[fg_console];
>  
> @@ -3668,9 +3646,6 @@ static void fbcon_exit(void)
>  	struct fb_info *info;
>  	int i, j, mapped;
>  
> -	if (fbcon_has_exited)
> -		return;
> -
>  #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
>  	if (deferred_takeover) {
>  		dummycon_unregister_output_notifier(&fbcon_output_nb);
> @@ -3695,7 +3670,7 @@ static void fbcon_exit(void)
>  		for (j = first_fb_vc; j <= last_fb_vc; j++) {
>  			if (con2fb_map[j] == i) {
>  				mapped = 1;
> -				break;
> +				con2fb_map[j] = -1;
>  			}
>  		}
>  
> @@ -3718,8 +3693,6 @@ static void fbcon_exit(void)
>  				info->queue.func = NULL;
>  		}
>  	}
> -
> -	fbcon_has_exited = 1;
>  }
>  
>  void __init fb_console_init(void)
> -- 
> 2.20.1
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

WARNING: multiple messages have this Message-ID
From: Sam Ravnborg <sam@ravnborg.org>
To: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Prarit Bhargava <prarit@redhat.com>,
	Kees Cook <keescook@chromium.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
	LKML <linux-kernel@vger.kernel.org>,
	DRI Development <dri-devel@lists.freedesktop.org>,
	Yisheng Xie <ysxie@foxmail.com>,
	Daniel Vetter <daniel.vetter@intel.com>,
	Konstantin Khorenko <khorenko@virtuozzo.com>
Subject: Re: [PATCH 09/33] fbcon: Remove fbcon_has_exited
Date: Sat, 25 May 2019 17:38:26 +0200	[thread overview]
Message-ID: <20190525153826.GA8661@ravnborg.org> (raw)
In-Reply-To: <20190524085354.27411-10-daniel.vetter@ffwll.ch>

Hi Daniel.

One detail I noticed while brosing the changes.

>  
> @@ -1064,9 +1062,13 @@ static void fbcon_init(struct vc_data *vc, int init)
>  	int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
>  	int cap, ret;
>  
> -	if (info_idx == -1 || info == NULL)
> +	if (WARN_ON(info_idx == -1))
>  	    return;
>  
> +	if (con2fb_map[vc->vc_num] == -1)
> +		con2fb_map[vc->vc_num] = info_idx;
> +
> +	info = registered_fb[con2fb_map[vc->vc_num]];
>  	cap = info->flags;

When info is defined it is also assigned:
struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];

As the test for info is gone this assignment is no longer
requrired and can be deleted.

The code now assumes that there is always an fb_info if con2fb_map[]
is not set to -1. I could not determine if this is OK, but this
likely boils down to your locking concern of registered_fb.

	Sam

>  
>  	if (logo_shown < 0 && console_loglevel <= CONSOLE_LOGLEVEL_QUIET)
> @@ -3336,14 +3338,6 @@ static int fbcon_event_notify(struct notifier_block *self,
>  	struct fb_blit_caps *caps;
>  	int idx, ret = 0;
>  
> -	/*
> -	 * ignore all events except driver registration and deregistration
> -	 * if fbcon is not active
> -	 */
> -	if (fbcon_has_exited && !(action == FB_EVENT_FB_REGISTERED ||
> -				  action == FB_EVENT_FB_UNREGISTERED))
> -		goto done;
> -
>  	switch(action) {
>  	case FB_EVENT_SUSPEND:
>  		fbcon_suspended(info);
> @@ -3396,7 +3390,6 @@ static int fbcon_event_notify(struct notifier_block *self,
>  		fbcon_remap_all(idx);
>  		break;
>  	}
> -done:
>  	return ret;
>  }
>  
> @@ -3443,9 +3436,6 @@ static ssize_t store_rotate(struct device *device,
>  	int rotate, idx;
>  	char **last = NULL;
>  
> -	if (fbcon_has_exited)
> -		return count;
> -
>  	console_lock();
>  	idx = con2fb_map[fg_console];
>  
> @@ -3468,9 +3458,6 @@ static ssize_t store_rotate_all(struct device *device,
>  	int rotate, idx;
>  	char **last = NULL;
>  
> -	if (fbcon_has_exited)
> -		return count;
> -
>  	console_lock();
>  	idx = con2fb_map[fg_console];
>  
> @@ -3491,9 +3478,6 @@ static ssize_t show_rotate(struct device *device,
>  	struct fb_info *info;
>  	int rotate = 0, idx;
>  
> -	if (fbcon_has_exited)
> -		return 0;
> -
>  	console_lock();
>  	idx = con2fb_map[fg_console];
>  
> @@ -3514,9 +3498,6 @@ static ssize_t show_cursor_blink(struct device *device,
>  	struct fbcon_ops *ops;
>  	int idx, blink = -1;
>  
> -	if (fbcon_has_exited)
> -		return 0;
> -
>  	console_lock();
>  	idx = con2fb_map[fg_console];
>  
> @@ -3543,9 +3524,6 @@ static ssize_t store_cursor_blink(struct device *device,
>  	int blink, idx;
>  	char **last = NULL;
>  
> -	if (fbcon_has_exited)
> -		return count;
> -
>  	console_lock();
>  	idx = con2fb_map[fg_console];
>  
> @@ -3668,9 +3646,6 @@ static void fbcon_exit(void)
>  	struct fb_info *info;
>  	int i, j, mapped;
>  
> -	if (fbcon_has_exited)
> -		return;
> -
>  #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
>  	if (deferred_takeover) {
>  		dummycon_unregister_output_notifier(&fbcon_output_nb);
> @@ -3695,7 +3670,7 @@ static void fbcon_exit(void)
>  		for (j = first_fb_vc; j <= last_fb_vc; j++) {
>  			if (con2fb_map[j] == i) {
>  				mapped = 1;
> -				break;
> +				con2fb_map[j] = -1;
>  			}
>  		}
>  
> @@ -3718,8 +3693,6 @@ static void fbcon_exit(void)
>  				info->queue.func = NULL;
>  		}
>  	}
> -
> -	fbcon_has_exited = 1;
>  }
>  
>  void __init fb_console_init(void)
> -- 
> 2.20.1
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

  reply	other threads:[~2019-05-25 15:40 UTC|newest]

Thread overview: 106+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-24  8:53 [PATCH 00/33] fbcon notifier begone! Daniel Vetter
2019-05-24  8:53 ` Daniel Vetter
2019-05-24  8:53 ` [PATCH 01/33] dummycon: Sprinkle locking checks Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53 ` [PATCH 02/33] fbdev: locking check for fb_set_suspend Daniel Vetter
2019-05-24  8:53 ` [PATCH 03/33] vt: might_sleep() annotation for do_blank_screen Daniel Vetter
2019-05-24  8:53 ` [PATCH 04/33] vt: More locking checks Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-27  7:08   ` Daniel Vetter
2019-05-27  7:08     ` Daniel Vetter
2019-05-27  7:22     ` Greg Kroah-Hartman
2019-05-24  8:53 ` [PATCH 05/33] fbdev/sa1100fb: Remove dead code Daniel Vetter
2019-05-24  8:53 ` [PATCH 06/33] fbdev/cyber2000: Remove struct display Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53 ` [PATCH 07/33] fbdev/aty128fb: Remove dead code Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53 ` [PATCH 08/33] fbcon: s/struct display/struct fbcon_display/ Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53 ` [PATCH 09/33] fbcon: Remove fbcon_has_exited Daniel Vetter
2019-05-25 15:38   ` Sam Ravnborg [this message]
2019-05-25 15:38     ` Sam Ravnborg
2019-05-27  6:10     ` Daniel Vetter
2019-05-27  6:10       ` Daniel Vetter
2019-05-27  6:51       ` Sam Ravnborg
2019-05-27  6:51         ` Sam Ravnborg
2019-05-24  8:53 ` [PATCH 10/33] fbcon: call fbcon_fb_(un)registered directly Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53 ` [PATCH 11/33] fbdev/sh_mobile: remove sh_mobile_lcdc_display_notify Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-25 15:01   ` Sam Ravnborg
2019-05-25 15:01     ` Sam Ravnborg
2019-05-27  6:13     ` Daniel Vetter
2019-05-27  6:52       ` Sam Ravnborg
2019-05-24  8:53 ` [PATCH 12/33] fbdev/omap: sysfs files can't disappear before the device is gone Daniel Vetter
2019-05-24  8:53 ` [PATCH 13/33] fbdev: " Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53 ` [PATCH 14/33] staging/olpc: lock_fb_info can't fail Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-27  7:10   ` Daniel Vetter
2019-05-27  7:22     ` Greg KH
2019-05-27  7:22       ` Greg KH
2019-05-24  8:53 ` [PATCH 15/33] fbdev/atyfb: " Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53 ` [PATCH 16/33] fbdev: lock_fb_info cannot fail Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53 ` [PATCH 17/33] fbcon: call fbcon_fb_bind directly Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53 ` [PATCH 18/33] fbdev: make unregister/unlink functions not fail Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53 ` [PATCH 19/33] fbdev: unify unlink_framebuffer paths Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53 ` [PATCH 20/33] fbdev/sh_mob: Remove fb notifier callback Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53 ` [PATCH 21/33] fbdev: directly call fbcon_suspended/resumed Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53 ` [PATCH 22/33] fbcon: Call fbcon_mode_deleted/new_modelist directly Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53 ` [PATCH 23/33] fbdev: Call fbcon_get_requirement directly Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53 ` [PATCH 24/33] Revert "backlight/fbcon: Add FB_EVENT_CONBLANK" Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24 13:14   ` Daniel Thompson
2019-05-24 13:14     ` Daniel Thompson
2019-05-24 13:14     ` Daniel Thompson
2019-05-24 15:28     ` Daniel Vetter
2019-05-24 15:28       ` Daniel Vetter
2019-05-27 10:59       ` Bartlomiej Zolnierkiewicz
2019-05-27 10:59         ` Bartlomiej Zolnierkiewicz
2019-05-24  8:53 ` [PATCH 25/33] fbmem: pull fbcon_fb_blanked out of fb_blank Daniel Vetter
2019-05-25 17:00   ` Sam Ravnborg
2019-05-25 17:00     ` Sam Ravnborg
2019-05-24  8:53 ` [PATCH 26/33] fbdev: remove FBINFO_MISC_USEREVENT around fb_blank Daniel Vetter
2019-05-24  8:53 ` [PATCH 27/33] fb: Flatten control flow in fb_set_var Daniel Vetter
2019-05-24  8:53 ` [PATCH 28/33] fbcon: replace FB_EVENT_MODE_CHANGE/_ALL with direct calls Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53 ` [PATCH 29/33] vgaswitcheroo: call fbcon_remap_all directly Daniel Vetter
2019-05-24  8:53   ` Daniel Vetter
2019-05-24  8:53 ` [PATCH 30/33] fbcon: Call con2fb_map functions directly Daniel Vetter
2019-05-24  8:53 ` [PATCH 31/33] fbcon: Document what I learned about fbcon locking Daniel Vetter
2019-05-24  8:53 ` [PATCH 32/33] staging/olpc_dcon: Add drm conversion to TODO Daniel Vetter
2019-05-27  7:11   ` Daniel Vetter
2019-05-27  7:11     ` Daniel Vetter
2019-05-27  7:22     ` Greg KH
2019-05-24  8:53 ` [PATCH 33/33] backlight: simplify lcd notifier Daniel Vetter
2019-05-24 11:03 ` ✗ Fi.CI.CHECKPATCH: warning for fbcon notifier begone! (rev3) Patchwork
2019-05-24 11:18 ` ✗ Fi.CI.SPARSE: " Patchwork
2019-05-24 11:23 ` ✓ Fi.CI.BAT: success " Patchwork
2019-05-25 17:19 ` [PATCH 00/33] fbcon notifier begone! Sam Ravnborg
2019-05-27  7:17   ` Daniel Vetter
2019-05-27 11:56     ` Daniel Vetter
2019-05-25 17:24 ` ✗ Fi.CI.IGT: failure for fbcon notifier begone! (rev3) Patchwork
2019-05-26 15:34 ` ✗ Fi.CI.CHECKPATCH: warning for fbcon notifier begone! (rev4) Patchwork
2019-05-26 15:49 ` ✗ Fi.CI.SPARSE: " Patchwork
2019-05-26 15:53 ` ✓ Fi.CI.BAT: success " Patchwork
2019-05-27 11:02 ` ✓ Fi.CI.IGT: " Patchwork
  -- strict thread matches above, loose matches on Subject: below --
2019-05-28  9:02 [PATCH 00/33] fbcon notifier begone v3! Daniel Vetter
2019-05-28  9:02 ` [PATCH 09/33] fbcon: Remove fbcon_has_exited Daniel Vetter
2019-05-28  9:02   ` Daniel Vetter
2019-05-28  9:02   ` Daniel Vetter
2019-05-20  8:21 [PATCH 00/33] fbcon notifier begone! Daniel Vetter
2019-05-20  8:21 ` [PATCH 09/33] fbcon: Remove fbcon_has_exited Daniel Vetter
2019-05-20  8:21   ` Daniel Vetter

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