The patch titled
fbdev: fbcon: console unregistration from unregister_framebuffer
has been added to the -mm tree. Its filename is
fbdev-fbcon-console-unregistration-from-unregister_framebuffer.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: fbdev: fbcon: console unregistration from unregister_framebuffer
From: Jesse Barnes <jesse.barnes@xxxxxxxxx>
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().
Signed-off-by: Jesse Barnes <jesse.barnes@xxxxxxxxx>
Signed-off-by: Antonino Daplas <adaplas@xxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/video/console/fbcon.c | 42 ++++++++++++++++++++++++++++++++
drivers/video/fbmem.c | 26 ++++++++++++++++---
include/linux/fb.h | 2 +
3 files changed, 66 insertions(+), 4 deletions(-)
diff -puN drivers/video/console/fbcon.c~fbdev-fbcon-console-unregistration-from-unregister_framebuffer drivers/video/console/fbcon.c
--- a/drivers/video/console/fbcon.c~fbdev-fbcon-console-unregistration-from-unregister_framebuffer
+++ a/drivers/video/console/fbcon.c
@@ -3003,6 +3003,45 @@ static int fbcon_mode_deleted(struct fb_
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 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 not
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;
diff -puN drivers/video/fbmem.c~fbdev-fbcon-console-unregistration-from-unregister_framebuffer drivers/video/fbmem.c
--- a/drivers/video/fbmem.c~fbdev-fbcon-console-unregistration-from-unregister_framebuffer
+++ a/drivers/video/fbmem.c
@@ -1334,17 +1334,34 @@ register_framebuffer(struct fb_info *fb_
*
* 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 *f
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;
}
/**
diff -puN include/linux/fb.h~fbdev-fbcon-console-unregistration-from-unregister_framebuffer include/linux/fb.h
--- a/include/linux/fb.h~fbdev-fbcon-console-unregistration-from-unregister_framebuffer
+++ a/include/linux/fb.h
@@ -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;
_
Patches currently in -mm which might be from jesse.barnes@xxxxxxxxx are
remove-pci_dac_dma_-apis.patch
change-zonelist-order-zonelist-order-selection-logic.patch
change-zonelist-order-v6-zonelist-fix.patch
change-zonelist-order-auto-configuration.patch
change-zonelist-order-documentaion.patch
fbdev-fbcon-console-unregistration-from-unregister_framebuffer.patch
fbdev-fbcon-console-unregistration-from-unregister_framebuffer-fix.patch
vt-add-comment-for-unbind_con_driver.patch
-
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