From: Thomas Zimmermann tzimmermann@suse.de
[ Upstream commit 12d5796d55f9fd9e4b621003127c99e176665064 ]
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.r... # 3 Reviewed-by: Javier Martinez Canillas javierm@redhat.com Link: https://patchwork.freedesktop.org/patch/msgid/20221219160516.23436-3-tzimmer... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/video/fbdev/core/fbcon.c | 17 ++++++----------- 1 file changed, 6 insertions(+), 11 deletions(-)
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c index d90d807c67561..b6712655ec1f0 100644 --- a/drivers/video/fbdev/core/fbcon.c +++ b/drivers/video/fbdev/core/fbcon.c @@ -989,7 +989,7 @@ 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, @@ -999,8 +999,6 @@ 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); @@ -1167,9 +1165,9 @@ 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; @@ -1183,8 +1181,8 @@ 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) @@ -1195,8 +1193,6 @@ 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) @@ -1208,9 +1204,8 @@ static void fbcon_deinit(struct vc_data *vc) ops->flags &= ~FBCON_FLAGS_INIT; 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);