On Sat, 3 Oct 2015, Alistair Popple wrote:
> Hi,
>
> We have been intermittently seeing the below RCU stall at boot on a
> PPC64LE 4.2.1 kernel which has been preventing the system from booting.
> Further investigation indicates that ops->cur_blink_jiffies is
> potentially being used uninitialised in cursor_timer_handler():
>
> static void cursor_timer_handler(unsigned long dev_addr)
> {
> struct fb_info *info = (struct fb_info *) dev_addr;
> struct fbcon_ops *ops = info->fbcon_par;
>
> queue_work(system_power_efficient_wq, &info->queue);
> mod_timer(&ops->cursor_timer, jiffies + ops->cur_blink_jiffies);
> }
...
Hi Alistair, thanks so much for the detailed report. Does this patch
correct the stalls?
diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c
index 1aaf893..92f3949 100644
--- a/drivers/video/console/fbcon.c
+++ b/drivers/video/console/fbcon.c
@@ -1093,6 +1093,7 @@ static void fbcon_init(struct vc_data *vc, int init)
con_copy_unimap(vc, svc);
ops = info->fbcon_par;
+ ops->cur_blink_jiffies = msecs_to_jiffies(vc->vc_cur_blink_ms);
p->con_rotate = initial_rotation;
set_blitting_type(vc, info);
--
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