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authorDaniel Vetter <daniel.vetter@ffwll.ch>2023-04-12 17:23:49 +0200
committerDaniel Vetter <daniel.vetter@ffwll.ch>2023-04-13 20:09:55 +0200
commitedf79dd2172233452ff142dcc98b19d955fc8974 (patch)
tree07231d46907c6d22322a152716bc1779e7f7eaae /drivers
parenta552b73f36cb3e59fd2015307fde8ff53874d1af (diff)
fbcon: Fix error paths in set_con2fb_map
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+
Diffstat (limited to 'drivers')
-rw-r--r--drivers/video/fbdev/core/fbcon.c17
1 files changed, 8 insertions, 9 deletions
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 0a2c47df01f4..52f6ce8e794a 100644
--- 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 newidx, int user)
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 newidx, int user)
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);