Ideally console_lock becomes an implementation detail of fbcon.c and doesn't show up anywhere in fbmem.c. We're still pretty far from that, but at least the register/unregister code is there now.
With this the do_fb_ioctl() handler is the only code in fbmem.c still calling console_lock().
Acked-by: Sam Ravnborg sam@ravnborg.org Signed-off-by: Daniel Vetter daniel.vetter@intel.com Cc: Daniel Vetter daniel@ffwll.ch Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Du Cheng ducheng2@gmail.com Cc: Claudio Suarez cssk@net-c.es Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp Cc: Matthew Wilcox willy@infradead.org Cc: Sam Ravnborg sam@ravnborg.org Cc: Zheyu Ma zheyuma97@gmail.com Cc: Guenter Roeck linux@roeck-us.net Cc: Alex Deucher alexander.deucher@amd.com Cc: Zhen Lei thunder.leizhen@huawei.com Cc: Xiyu Yang xiyuyang19@fudan.edu.cn --- drivers/video/fbdev/core/fbcon.c | 33 ++++++++++++++++++++++++++------ drivers/video/fbdev/core/fbmem.c | 23 ++-------------------- 2 files changed, 29 insertions(+), 27 deletions(-)
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c index 4f9752ee9189..abb419a091c6 100644 --- a/drivers/video/fbdev/core/fbcon.c +++ b/drivers/video/fbdev/core/fbcon.c @@ -2756,10 +2756,12 @@ void fbcon_fb_unbind(struct fb_info *info) int i, new_idx = -1; int idx = info->node;
- WARN_CONSOLE_UNLOCKED(); + console_lock();
- if (!fbcon_has_console_bind) + if (!fbcon_has_console_bind) { + console_unlock(); return; + }
for (i = first_fb_vc; i <= last_fb_vc; i++) { if (con2fb_map[i] != idx && @@ -2794,6 +2796,8 @@ void fbcon_fb_unbind(struct fb_info *info) } fbcon_unbind(); } + + console_unlock(); }
/* called with console_lock held */ @@ -2801,10 +2805,12 @@ void fbcon_fb_unregistered(struct fb_info *info) { int i, idx;
- WARN_CONSOLE_UNLOCKED(); + console_lock();
- if (deferred_takeover) + if (deferred_takeover) { + console_unlock(); return; + }
idx = info->node; for (i = first_fb_vc; i <= last_fb_vc; i++) { @@ -2833,6 +2839,7 @@ void fbcon_fb_unregistered(struct fb_info *info)
if (!num_registered_fb) do_unregister_con_driver(&fb_con); + console_unlock(); }
void fbcon_remap_all(struct fb_info *info) @@ -2890,19 +2897,27 @@ static inline void fbcon_select_primary(struct fb_info *info) } #endif /* CONFIG_FRAMEBUFFER_DETECT_PRIMARY */
+static bool lockless_register_fb; +module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400); +MODULE_PARM_DESC(lockless_register_fb, + "Lockless framebuffer registration for debugging [default=off]"); + /* called with console_lock held */ int fbcon_fb_registered(struct fb_info *info) { int ret = 0, i, idx;
- WARN_CONSOLE_UNLOCKED(); + if (!lockless_register_fb) + console_lock(); + else + atomic_inc(&ignore_console_lock_warning);
idx = info->node; fbcon_select_primary(info);
if (deferred_takeover) { pr_info("fbcon: Deferring console take-over\n"); - return 0; + goto out; }
if (info_idx == -1) { @@ -2922,6 +2937,12 @@ int fbcon_fb_registered(struct fb_info *info) } }
+out: + if (!lockless_register_fb) + console_unlock(); + else + atomic_dec(&ignore_console_lock_warning); + return ret; }
diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c index 0e68d9456bc2..bdd00d381bbc 100644 --- a/drivers/video/fbdev/core/fbmem.c +++ b/drivers/video/fbdev/core/fbmem.c @@ -1590,14 +1590,9 @@ static void do_remove_conflicting_framebuffers(struct apertures_struct *a, } }
-static bool lockless_register_fb; -module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400); -MODULE_PARM_DESC(lockless_register_fb, - "Lockless framebuffer registration for debugging [default=off]"); - static int do_register_framebuffer(struct fb_info *fb_info) { - int i, ret; + int i; struct fb_videomode mode;
if (fb_check_foreignness(fb_info)) @@ -1666,17 +1661,7 @@ static int do_register_framebuffer(struct fb_info *fb_info) } #endif
- if (!lockless_register_fb) - console_lock(); - else - atomic_inc(&ignore_console_lock_warning); - ret = fbcon_fb_registered(fb_info); - - if (!lockless_register_fb) - console_unlock(); - else - atomic_dec(&ignore_console_lock_warning); - return ret; + return fbcon_fb_registered(fb_info); }
static void unbind_console(struct fb_info *fb_info) @@ -1686,9 +1671,7 @@ static void unbind_console(struct fb_info *fb_info) if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) return;
- console_lock(); fbcon_fb_unbind(fb_info); - console_unlock(); }
static void unlink_framebuffer(struct fb_info *fb_info) @@ -1731,9 +1714,7 @@ static void do_unregister_framebuffer(struct fb_info *fb_info) fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event); } #endif - console_lock(); fbcon_fb_unregistered(fb_info); - console_unlock();
/* this may free fb info */ put_fb_info(fb_info);