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authorAlan Cox <alan@linux.intel.com>2013-01-25 10:28:15 +1000
committerDave Airlie <airlied@redhat.com>2013-02-08 12:02:40 +1000
commit50e244cc793d511b86adea24972f3a7264cae114 (patch)
treede59e5f228a256ad09521524639e1b5b6e49b8cc /drivers/video/fbmem.c
parent84b603abd23300df8ee5fb1c23c83634c2aaedea (diff)
fb: rework locking to fix lock ordering on takeover
Adjust the console layer to allow a take over call where the caller already holds the locks. Make the fb layer lock in order. This is partly a band aid, the fb layer is terminally confused about the locking rules it uses for its notifiers it seems. [akpm@linux-foundation.org: remove stray non-ascii char, tidy comment] [akpm@linux-foundation.org: export do_take_over_console()] [airlied: cleanup another non-ascii char] Signed-off-by: Alan Cox <alan@linux.intel.com> Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Jiri Kosina <jkosina@suse.cz> Cc: stable <stable@vger.kernel.org> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/video/fbmem.c')
-rw-r--r--drivers/video/fbmem.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index 3ff0105a496a..d8d9831b3fdb 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -1650,7 +1650,9 @@ static int do_register_framebuffer(struct fb_info *fb_info)
event.info = fb_info;
if (!lock_fb_info(fb_info))
return -ENODEV;
+ console_lock();
fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
+ console_unlock();
unlock_fb_info(fb_info);
return 0;
}
@@ -1853,11 +1855,8 @@ int fb_new_modelist(struct fb_info *info)
err = 1;
if (!list_empty(&info->modelist)) {
- if (!lock_fb_info(info))
- return -ENODEV;
event.info = info;
err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
- unlock_fb_info(info);
}
return err;