Commit cfafca80 authored by Jesse Barnes's avatar Jesse Barnes Committed by Linus Torvalds

fbdev: fbcon: console unregistration from unregister_framebuffer

This allows for proper console unregistration via the VT layer, and updates
the FB layer to use it.  This makes debugging new console drivers much easier,
since you can properly clean them up before unloading.

[adaplas]
unregister_framebuffer() is typically called as part of the driver's
module_exit(). Doing so otherwise will freeze the machine as the VT layer is
holding reference counts on fbcon, and fbcon on the driver.  With this change,
it allows unregister_framebuffer() to be called safely anywhere as needed.

Additions from the original:  If multiple drivers are used by fbcon, and if
one of them unregisters, a driver will take over the consoles vacated by the
outgoing one (via set_con2fb_map).   Once only the outgoing driver remains,
then fbcon will unbind from the VT layer (if CONFIG_HW_CONSOLE_UNBINDING is
set to y).

It is important that these drivers implement fb_open() and fb_release()
just to ensure that no other process is using the driver. Likewise, these
drivers _must_ check the return value of unregister_framebuffer().

[akpm@linux-foundation.org: make fbcon_unbind() stub inline]
Signed-off-by: default avatarJesse Barnes <jesse.barnes@intel.com>
Signed-off-by: default avatarAntonino Daplas <adaplas@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent afd1db16
......@@ -3003,6 +3003,45 @@ static int fbcon_mode_deleted(struct fb_info *info,
return found;
}
#ifdef CONFIG_VT_HW_CONSOLE_BINDING
static int fbcon_unbind(void)
{
int ret;
ret = unbind_con_driver(&fb_con, first_fb_vc, last_fb_vc,
fbcon_is_default);
return ret;
}
#else
static inline int fbcon_unbind(void)
{
return -EINVAL;
}
#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
static int fbcon_fb_unbind(int idx)
{
int i, new_idx = -1, ret = 0;
for (i = first_fb_vc; i <= last_fb_vc; i++) {
if (con2fb_map[i] != idx &&
con2fb_map[i] != -1) {
new_idx = i;
break;
}
}
if (new_idx != -1) {
for (i = first_fb_vc; i <= last_fb_vc; i++) {
if (con2fb_map[i] == idx)
set_con2fb_map(i, new_idx, 0);
}
} else
ret = fbcon_unbind();
return ret;
}
static int fbcon_fb_unregistered(struct fb_info *info)
{
int i, idx = info->node;
......@@ -3210,6 +3249,9 @@ static int fbcon_event_notify(struct notifier_block *self,
mode = event->data;
ret = fbcon_mode_deleted(info, mode);
break;
case FB_EVENT_FB_UNBIND:
ret = fbcon_fb_unbind(info->node);
break;
case FB_EVENT_FB_REGISTERED:
ret = fbcon_fb_registered(info);
break;
......
......@@ -1334,17 +1334,34 @@ register_framebuffer(struct fb_info *fb_info)
*
* Returns negative errno on error, or zero for success.
*
* This function will also notify the framebuffer console
* to release the driver.
*
* This is meant to be called within a driver's module_exit()
* function. If this is called outside module_exit(), ensure
* that the driver implements fb_open() and fb_release() to
* check that no processes are using the device.
*/
int
unregister_framebuffer(struct fb_info *fb_info)
{
struct fb_event event;
int i;
int i, ret = 0;
i = fb_info->node;
if (!registered_fb[i])
return -EINVAL;
if (!registered_fb[i]) {
ret = -EINVAL;
goto done;
}
event.info = fb_info;
ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
if (ret) {
ret = -EINVAL;
goto done;
}
if (fb_info->pixmap.addr &&
(fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
......@@ -1356,7 +1373,8 @@ unregister_framebuffer(struct fb_info *fb_info)
device_destroy(fb_class, MKDEV(FB_MAJOR, i));
event.info = fb_info;
fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
return 0;
done:
return ret;
}
/**
......
......@@ -529,6 +529,8 @@ struct fb_cursor_user {
#define FB_EVENT_CONBLANK 0x0C
/* Get drawing requirements */
#define FB_EVENT_GET_REQ 0x0D
/* Unbind from the console if possible */
#define FB_EVENT_FB_UNBIND 0x0E
struct fb_event {
struct fb_info *info;
......
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