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fb: Yet another band-aid for fixing lockdep mess

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I've still got lockdep warnings even after Alan's patch, and it seems that
yet more band aids are required to paper over similar paths for
unbind_con_driver() and unregister_con_driver().  After this hack, lockdep
warnings are finally gone.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Cc: Alan Cox <alan@linux.intel.com>
Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: stable <stable@vger.kernel.org>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Takashi Iwai 2013-01-25 10:28:18 +10:00 committed by Dave Airlie
parent 50e244cc79
commit e93a9a8687
5 changed files with 37 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
drivers/tty/vt/vt.c
View File

@ -3134,6 +3134,18 @@ static int con_is_graphics(const struct consw *csw, int first, int last)
* or 0 on success.
*/
int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
{
int retval;
console_lock();
retval = do_unbind_con_driver(csw, first, last, deflt);
console_unlock();
return retval;
}
EXPORT_SYMBOL(unbind_con_driver);
/* unlocked version of unbind_con_driver() */
int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
{
struct module *owner = csw->owner;
const struct consw *defcsw = NULL;
@ -3143,7 +3155,7 @@ int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
if (!try_module_get(owner))
return -ENODEV;
console_lock();
WARN_CONSOLE_UNLOCKED();
/* check if driver is registered and if it is unbindable */
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
@ -3156,10 +3168,8 @@ int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
}
}
if (retval) {
console_unlock();
if (retval)
goto err;
}
retval = -ENODEV;
@ -3175,15 +3185,11 @@ int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
}
}
if (retval) {
console_unlock();
if (retval)
goto err;
}
if (!con_is_bound(csw)) {
console_unlock();
if (!con_is_bound(csw))
goto err;
}
first = max(first, con_driver->first);
last = min(last, con_driver->last);
@ -3212,13 +3218,12 @@ int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
/* ignore return value, binding should not fail */
do_bind_con_driver(defcsw, first, last, deflt);
console_unlock();
err:
module_put(owner);
return retval;
}
EXPORT_SYMBOL(unbind_con_driver);
EXPORT_SYMBOL_GPL(do_unbind_con_driver);
static int vt_bind(struct con_driver *con)
{
@ -3605,9 +3610,18 @@ EXPORT_SYMBOL(register_con_driver);
*/
int unregister_con_driver(const struct consw *csw)
{
int i, retval = -ENODEV;
int retval;
console_lock();
retval = do_unregister_con_driver(csw);
console_unlock();
return retval;
}
EXPORT_SYMBOL(unregister_con_driver);
int do_unregister_con_driver(const struct consw *csw)
{
int i, retval = -ENODEV;
/* cannot unregister a bound driver */
if (con_is_bound(csw))
@ -3633,10 +3647,9 @@ int unregister_con_driver(const struct consw *csw)
}
}
err:
console_unlock();
return retval;
}
EXPORT_SYMBOL(unregister_con_driver);
EXPORT_SYMBOL_GPL(do_unregister_con_driver);
/*
* If we support more console drivers, this function is used

4
drivers/video/console/fbcon.c
View File

@ -3004,7 +3004,7 @@ static int fbcon_unbind(void)
{
int ret;
ret = unbind_con_driver(&fb_con, first_fb_vc, last_fb_vc,
ret = do_unbind_con_driver(&fb_con, first_fb_vc, last_fb_vc,
fbcon_is_default);
if (!ret)
@ -3077,7 +3077,7 @@ static int fbcon_fb_unregistered(struct fb_info *info)
primary_device = -1;
if (!num_registered_fb)
unregister_con_driver(&fb_con);
do_unregister_con_driver(&fb_con);
return 0;
}

4
drivers/video/fbmem.c
View File

@ -1668,8 +1668,10 @@ static int do_unregister_framebuffer(struct fb_info *fb_info)
if (!lock_fb_info(fb_info))
return -ENODEV;
console_lock();
event.info = fb_info;
ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
console_unlock();
unlock_fb_info(fb_info);
if (ret)
@ -1684,7 +1686,9 @@ static int do_unregister_framebuffer(struct fb_info *fb_info)
num_registered_fb--;
fb_cleanup_device(fb_info);
event.info = fb_info;
console_lock();
fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
console_unlock();
/* this may free fb info */
put_fb_info(fb_info);

1
include/linux/console.h
View File

@ -77,6 +77,7 @@ extern const struct consw prom_con; /* SPARC PROM console */
int con_is_bound(const struct consw *csw);
int register_con_driver(const struct consw *csw, int first, int last);
int unregister_con_driver(const struct consw *csw);
int do_unregister_con_driver(const struct consw *csw);
int take_over_console(const struct consw *sw, int first, int last, int deflt);
int do_take_over_console(const struct consw *sw, int first, int last, int deflt);
void give_up_console(const struct consw *sw);

2
include/linux/vt_kern.h
View File

@ -130,6 +130,8 @@ void vt_event_post(unsigned int event, unsigned int old, unsigned int new);
int vt_waitactive(int n);
void change_console(struct vc_data *new_vc);
void reset_vc(struct vc_data *vc);
extern int do_unbind_con_driver(const struct consw *csw, int first, int last,
int deflt);
extern int unbind_con_driver(const struct consw *csw, int first, int last,
int deflt);
int vty_init(const struct file_operations *console_fops);