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SubjectRe: [Linux-fbdev-devel] [fbdev] Lockdep error
On Mon, 15 Sep 2008 16:21:52 +0400
Dmitry Baryshkov <dbaryshkov@gmail.com> wrote:

> Hi,
>
> After doing
> # echo 1 > /sys/class/graphics/fb0/blank
> I got the following in my kernel log:
>
> =============================================
> [ INFO: possible recursive locking detected ]
> 2.6.27-rc6-00086-gda63874-dirty #97
> ---------------------------------------------
> echo/1564 is trying to acquire lock:
> ((fb_notifier_list).rwsem){..--}, at: [<c005a384>] __blocking_notifier_call_chain+0x38/0x6c
>

Does the patch below fix the problem for you?

Kind regards,
Krzysztof

diff -urp linux-ref/drivers/video/console/fbcon.c linux-mm/drivers/video/console/fbcon.c
--- linux-ref/drivers/video/console/fbcon.c 2008-09-05 23:38:47.000000000 +0200
+++ linux-mm/drivers/video/console/fbcon.c 2008-09-16 23:30:52.309604454 +0200
@@ -2400,11 +2400,15 @@ static int fbcon_blank(struct vc_data *v

if (!fbcon_is_inactive(vc, info)) {
if (ops->blank_state != blank) {
+ int ret = 1;
+
ops->blank_state = blank;
fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
ops->cursor_flash = (!blank);

- if (fb_blank(info, blank))
+ if (info->fbops->fb_blank)
+ ret = info->fbops->fb_blank(blank, info);
+ if (ret)
fbcon_generic_blank(vc, info, blank);
}


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