From: Daniel Vetter daniel.vetter@ffwll.ch
commit edf79dd2172233452ff142dcc98b19d955fc8974 upstream.
This is a regressoin introduced in b07db3958485 ("fbcon: Ditch error handling for con2fb_release_oldinfo"). I failed to realize what the if (!err) checks. The mentioned commit was dropping the con2fb_release_oldinfo() return value but the if (!err) was also checking whether the con2fb_acquire_newinfo() function call above failed or not.
Fix this with an early return statement.
Note that there's still a difference compared to the orginal state of the code, the below lines are now also skipped on error:
if (!search_fb_in_map(info_idx)) info_idx = newidx;
These are only needed when we've actually thrown out an old fb_info from the console mappings, which only happens later on.
Also move the fbcon_add_cursor_work() call into the same if block, it's all protected by console_lock so doesn't matter when we set up the blinking cursor delayed work anyway. This further simplifies the control flow and allows us to ditch the found local variable.
v2: Clarify commit message (Javier)
Signed-off-by: Daniel Vetter daniel.vetter@intel.com Reviewed-by: Javier Martinez Canillas javierm@redhat.com Acked-by: Helge Deller deller@gmx.de Tested-by: Xingyuan Mo hdthky0@gmail.com Fixes: b07db3958485 ("fbcon: Ditch error handling for con2fb_release_oldinfo") Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Sam Ravnborg sam@ravnborg.org Cc: Xingyuan Mo hdthky0@gmail.com Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Helge Deller deller@gmx.de Cc: stable@vger.kernel.org # v5.19+ Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/video/fbdev/core/fbcon.c | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-)
--- a/drivers/video/fbdev/core/fbcon.c +++ b/drivers/video/fbdev/core/fbcon.c @@ -823,7 +823,7 @@ static int set_con2fb_map(int unit, int int oldidx = con2fb_map[unit]; struct fb_info *info = fbcon_registered_fb[newidx]; struct fb_info *oldinfo = NULL; - int found, err = 0, show_logo; + int err = 0, show_logo;
WARN_CONSOLE_UNLOCKED();
@@ -841,26 +841,25 @@ static int set_con2fb_map(int unit, int if (oldidx != -1) oldinfo = fbcon_registered_fb[oldidx];
- found = search_fb_in_map(newidx); - - if (!err && !found) { + if (!search_fb_in_map(newidx)) { err = con2fb_acquire_newinfo(vc, info, unit); - if (!err) - con2fb_map[unit] = newidx; + if (err) + return err; + + con2fb_map[unit] = newidx; + fbcon_add_cursor_work(info); }
/* * If old fb is not mapped to any of the consoles, * fbcon should release it. */ - if (!err && oldinfo && !search_fb_in_map(oldidx)) + if (oldinfo && !search_fb_in_map(oldidx)) con2fb_release_oldinfo(vc, oldinfo, info);
show_logo = (fg_console == 0 && !user && logo_shown != FBCON_LOGO_DONTSHOW);
- if (!found) - fbcon_add_cursor_work(info); con2fb_map_boot[unit] = newidx; con2fb_init_display(vc, info, unit, show_logo);