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Date: Tue, 8 Feb 2022 22:08:19 +0100
From: Daniel Vetter <daniel.vetter@...ll.ch>
To: DRI Development <dri-devel@...ts.freedesktop.org>
Cc: Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
linux-fbdev@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
Daniel Vetter <daniel.vetter@...ll.ch>,
Sam Ravnborg <sam@...nborg.org>,
Daniel Vetter <daniel.vetter@...el.com>,
Daniel Vetter <daniel@...ll.ch>,
Thomas Zimmermann <tzimmermann@...e.de>,
Du Cheng <ducheng2@...il.com>, Claudio Suarez <cssk@...-c.es>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
Matthew Wilcox <willy@...radead.org>,
Zheyu Ma <zheyuma97@...il.com>,
Guenter Roeck <linux@...ck-us.net>,
Alex Deucher <alexander.deucher@....com>,
Zhen Lei <thunder.leizhen@...wei.com>,
Xiyu Yang <xiyuyang19@...an.edu.cn>
Subject: [PATCH v2 14/19] fbcon: Move console_lock for register/unlink/unregister
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@...nborg.org>
Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: Thomas Zimmermann <tzimmermann@...e.de>
Cc: Du Cheng <ducheng2@...il.com>
Cc: Claudio Suarez <cssk@...-c.es>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc: Matthew Wilcox <willy@...radead.org>
Cc: Sam Ravnborg <sam@...nborg.org>
Cc: Zheyu Ma <zheyuma97@...il.com>
Cc: Guenter Roeck <linux@...ck-us.net>
Cc: Alex Deucher <alexander.deucher@....com>
Cc: Zhen Lei <thunder.leizhen@...wei.com>
Cc: Xiyu Yang <xiyuyang19@...an.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 37656883e7bd..6f6f7a763969 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1594,14 +1594,9 @@ 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))
@@ -1670,17 +1665,7 @@ 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)
@@ -1690,9 +1675,7 @@ 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)
@@ -1735,9 +1718,7 @@ 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);
--
2.34.1
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