From 9ad5cc9bcfd62b0f39e7f85992d2a371ff369324 Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Tue, 5 Apr 2022 23:03:23 +0200 Subject: [PATCH] fbdev/sysfs: Fix locking fb_set_var requires we hold the fb_info lock. Or at least this now matches what the ioctl does ... Note that ps3fb and sh_mobile_lcdcfb are busted in different ways here, but I will not fix them up. Also in practice this isn't a big deal, because really variable fbdev state is actually protected by console_lock (because fbcon just doesn't bother with lock_fb_info() at all), and lock_fb_info protecting anything is really just a neat lie. But that's a much bigger fish to fry. Acked-by: Thomas Zimmermann Acked-by: Sam Ravnborg Signed-off-by: Daniel Vetter Cc: Helge Deller Cc: Daniel Vetter Cc: Qing Wang Cc: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20220405210335.3434130-6-daniel.vetter@ffwll.ch --- drivers/video/fbdev/core/fbsysfs.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/video/fbdev/core/fbsysfs.c b/drivers/video/fbdev/core/fbsysfs.c index 2689294..8c1ee9e 100644 --- a/drivers/video/fbdev/core/fbsysfs.c +++ b/drivers/video/fbdev/core/fbsysfs.c @@ -91,9 +91,11 @@ static int activate(struct fb_info *fb_info, struct fb_var_screeninfo *var) var->activate |= FB_ACTIVATE_FORCE; console_lock(); + lock_fb_info(fb_info); err = fb_set_var(fb_info, var); if (!err) fbcon_update_vcs(fb_info, var->activate & FB_ACTIVATE_ALL); + unlock_fb_info(fb_info); console_unlock(); if (err) return err; -- 2.7.4