diff mbox series

[02/18] Revert "fbcon: don't lose the console font across generic->chip driver switch"

Message ID 20221219160516.23436-3-tzimmermann@suse.de (mailing list archive)
State New, archived
Headers show
Series drm,fbdev: Remove apertures structure and FBINFO_MISC_FIRMWARE | expand

Commit Message

Thomas Zimmermann Dec. 19, 2022, 4:05 p.m. UTC
This reverts commit ae1287865f5361fa138d4d3b1b6277908b54eac9.

Always free the console font when deinitializing the framebuffer
console. Subsequent framebuffer consoles will then use the default
font. Rely on userspace to load any user-configured font for these
consoles.

Commit ae1287865f53 ("fbcon: don't lose the console font across
generic->chip driver switch") was introduced to work around losing
the font during graphics-device handover. [1][2] It kept a dangling
pointer with the font data between loading the two consoles, which is
fairly adventurous hack. It also never covered cases when the other
consoles, such as VGA text mode, where involved.

The problem has meanwhile been solved in userspace. Systemd comes
with a udev rule that re-installs the configured font when a console
comes up. [3] So the kernel workaround can be removed.

This also removes one of the two special cases triggered by setting
FBINFO_MISC_FIRMWARE in an fbdev driver.

Tested during device handover from efifb and simpledrm to radeon. Udev
reloads the configured console font for the new driver's terminal.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://bugzilla.redhat.com/show_bug.cgi?id=892340 # 1
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1074624 # 2
Link: https://cgit.freedesktop.org/systemd/systemd/tree/src/vconsole/90-vconsole.rules.in?h=v222 # 3
---
 drivers/video/fbdev/core/fbcon.c | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

Comments

Javier Martinez Canillas Dec. 20, 2022, 9:17 a.m. UTC | #1
On 12/19/22 17:05, Thomas Zimmermann wrote:
> This reverts commit ae1287865f5361fa138d4d3b1b6277908b54eac9.
> 
> Always free the console font when deinitializing the framebuffer
> console. Subsequent framebuffer consoles will then use the default
> font. Rely on userspace to load any user-configured font for these
> consoles.
> 
> Commit ae1287865f53 ("fbcon: don't lose the console font across
> generic->chip driver switch") was introduced to work around losing
> the font during graphics-device handover. [1][2] It kept a dangling
> pointer with the font data between loading the two consoles, which is
> fairly adventurous hack. It also never covered cases when the other
> consoles, such as VGA text mode, where involved.
> 
> The problem has meanwhile been solved in userspace. Systemd comes
> with a udev rule that re-installs the configured font when a console
> comes up. [3] So the kernel workaround can be removed.
>
> This also removes one of the two special cases triggered by setting
> FBINFO_MISC_FIRMWARE in an fbdev driver.
> 
> Tested during device handover from efifb and simpledrm to radeon. Udev
> reloads the configured console font for the new driver's terminal.
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> Link: https://bugzilla.redhat.com/show_bug.cgi?id=892340 # 1
> Link: https://bugzilla.redhat.com/show_bug.cgi?id=1074624 # 2
> Link: https://cgit.freedesktop.org/systemd/systemd/tree/src/vconsole/90-vconsole.rules.in?h=v222 # 3
> ---

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
diff mbox series

Patch

diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 500b26d652f6..90b36b3adfd0 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -958,7 +958,7 @@  static const char *fbcon_startup(void)
 	set_blitting_type(vc, info);
 
 	/* Setup default font */
-	if (!p->fontdata && !vc->vc_font.data) {
+	if (!p->fontdata) {
 		if (!fontname[0] || !(font = find_font(fontname)))
 			font = get_default_font(info->var.xres,
 						info->var.yres,
@@ -968,8 +968,6 @@  static const char *fbcon_startup(void)
 		vc->vc_font.height = font->height;
 		vc->vc_font.data = (void *)(p->fontdata = font->data);
 		vc->vc_font.charcount = font->charcount;
-	} else {
-		p->fontdata = vc->vc_font.data;
 	}
 
 	cols = FBCON_SWAP(ops->rotate, info->var.xres, info->var.yres);
@@ -1135,9 +1133,9 @@  static void fbcon_init(struct vc_data *vc, int init)
 	ops->p = &fb_display[fg_console];
 }
 
-static void fbcon_free_font(struct fbcon_display *p, bool freefont)
+static void fbcon_free_font(struct fbcon_display *p)
 {
-	if (freefont && p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
+	if (p->userfont && p->fontdata && (--REFCOUNT(p->fontdata) == 0))
 		kfree(p->fontdata - FONT_EXTRA_WORDS * sizeof(int));
 	p->fontdata = NULL;
 	p->userfont = 0;
@@ -1172,8 +1170,8 @@  static void fbcon_deinit(struct vc_data *vc)
 	struct fb_info *info;
 	struct fbcon_ops *ops;
 	int idx;
-	bool free_font = true;
 
+	fbcon_free_font(p);
 	idx = con2fb_map[vc->vc_num];
 
 	if (idx == -1)
@@ -1184,8 +1182,6 @@  static void fbcon_deinit(struct vc_data *vc)
 	if (!info)
 		goto finished;
 
-	if (info->flags & FBINFO_MISC_FIRMWARE)
-		free_font = false;
 	ops = info->fbcon_par;
 
 	if (!ops)
@@ -1197,9 +1193,8 @@  static void fbcon_deinit(struct vc_data *vc)
 	ops->initialized = false;
 finished:
 
-	fbcon_free_font(p, free_font);
-	if (free_font)
-		vc->vc_font.data = NULL;
+	fbcon_free_font(p);
+	vc->vc_font.data = NULL;
 
 	if (vc->vc_hi_font_mask && vc->vc_screenbuf)
 		set_vc_hi_font(vc, false);