[PATCH 13/21] fbcon: move more common code into fb_open()

Daniel Vetter
2022-01-31T21:07:30Z

No idea why con2fb_acquire_newinfo() initializes much less than
fbcon_startup(), but so be it. From a quick look most of the
un-initialized stuff should be fairly harmless, but who knows.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Claudio Suarez <cssk@net-c.es>
Cc: Du Cheng <ducheng2@gmail.com>
---
drivers/video/fbdev/core/fbcon.c | 74 +++++++++++++-------------------
1 file changed, 31 insertions(+), 43 deletions(-)

diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index b83a5a77d8a8..5a3391ff038d 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -680,8 +680,18 @@ static int fbcon_invalid_charcount(struct fb_info *info, unsigned charcount)

#endif /* CONFIG_MISC_TILEBLITTING */

+static void fbcon_release(struct fb_info *info)
+{
+ if (info->fbops->fb_release)
+ info->fbops->fb_release(info, 0);
+
+ module_put(info->fbops->owner);
+}
+
static int fbcon_open(struct fb_info *info)
{
+ struct fbcon_ops *ops;
+
if (!try_module_get(info->fbops->owner))
return -ENODEV;

@@ -691,19 +701,22 @@ static int fbcon_open(struct fb_info *info)
return -ENODEV;
}

- return 0;
-}
+ ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
+ if (!ops) {
+ fbcon_release(info);
+ return -ENOMEM;
+ }

-static void fbcon_release(struct fb_info *info)
-{
- if (info->fbops->fb_release)
- info->fbops->fb_release(info, 0);
+ INIT_DELAYED_WORK(&ops->cursor_work, fb_flashcursor);
+ ops->info = info;
+ info->fbcon_par = ops;
+ ops->cur_blink_jiffies = HZ / 5;

- module_put(info->fbops->owner);
+ return 0;
}

static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info,
- int unit, int oldidx)
+ int unit)
{
struct fbcon_ops *ops = NULL;
int err;
@@ -712,27 +725,10 @@ static int con2fb_acquire_newinfo(struct vc_data *vc, struct fb_info *info,
if (err)
return err;

- if (!err) {
- ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
- if (!ops)
- err = -ENOMEM;
-
- INIT_DELAYED_WORK(&ops->cursor_work, fb_flashcursor);
- }
-
- if (!err) {
- ops->cur_blink_jiffies = HZ / 5;
- ops->info = info;
- info->fbcon_par = ops;
-
- if (vc)
- set_blitting_type(vc, info);
- }
+ ops = info->fbcon_par;

- if (err) {
- con2fb_map[unit] = oldidx;
- fbcon_release(info);
- }
+ if (vc)
+ set_blitting_type(vc, info);

return err;
}
@@ -840,9 +836,11 @@ static int set_con2fb_map(int unit, int newidx, int user)

found = search_fb_in_map(newidx);

- con2fb_map[unit] = newidx;
- if (!err && !found)
- err = con2fb_acquire_newinfo(vc, info, unit, oldidx);
+ if (!err && !found) {
+ err = con2fb_acquire_newinfo(vc, info, unit);
+ if (!err)
+ con2fb_map[unit] = newidx;
+ }

/*
* If old fb is not mapped to any of the consoles,
@@ -939,20 +937,10 @@ static const char *fbcon_startup(void)
if (fbcon_open(info))
return NULL;

- ops = kzalloc(sizeof(struct fbcon_ops), GFP_KERNEL);
- if (!ops) {
- fbcon_release(info);
- return NULL;
- }
-
- INIT_DELAYED_WORK(&ops->cursor_work, fb_flashcursor);
-
+ ops = info->fbcon_par;
ops->currcon = -1;
ops->graphics = 1;
ops->cur_rotate = -1;
- ops->cur_blink_jiffies = HZ / 5;
- ops->info = info;
- info->fbcon_par = ops;

p->con_rotate = initial_rotation;
if (p->con_rotate == -1)
@@ -1022,7 +1010,7 @@ static void fbcon_init(struct vc_data *vc, int init)
return;

if (!info->fbcon_par)
- con2fb_acquire_newinfo(vc, info, vc->vc_num, -1);
+ con2fb_acquire_newinfo(vc, info, vc->vc_num);

/* If we are not the first console on this
fb, copy the font from that console */
--
2.33.0