This is a note to let you know that I've just added the patch titled fbcon: set a default value to blink interval to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: fbcon-set-a-default-value-to-blink-interval.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From a1e533ec07d583d01349ef13c0c965b8633e1b91 Mon Sep 17 00:00:00 2001 From: Jean-Philippe Brucker <jean-philippe.brucker@xxxxxxx> Date: Mon, 15 Feb 2016 18:41:33 +0000 Subject: fbcon: set a default value to blink interval From: Jean-Philippe Brucker <jean-philippe.brucker@xxxxxxx> commit a1e533ec07d583d01349ef13c0c965b8633e1b91 upstream. Since commit 27a4c827c34ac4256a190cc9d24607f953c1c459 fbcon: use the cursor blink interval provided by vt two attempts have been made at fixing a possible hang caused by cursor_timer_handler. That function registers a timer to be triggered at "jiffies + fbcon_ops.cur_blink_jiffies". A new case had been encountered during initialisation of clcd-pl11x: fbcon_fb_registered do_fbcon_takeover -> do_register_con_driver fbcon_startup (A) add_cursor_timer (with cur_blink_jiffies = 0) -> do_bind_con_driver visual_init fbcon_init (B) cur_blink_jiffies = msecs_to_jiffies(vc->vc_cur_blink_ms); If we take an softirq anywhere between A and B (and we do), cursor_timer_handler executes indefinitely. Instead of patching all possible paths that lead to this case one at a time, fix the issue at the source and initialise cur_blink_jiffies to 200ms when allocating fbcon_ops. This was its default value before aforesaid commit. fbcon_cursor or fbcon_init will refine this value downstream. Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@xxxxxxx> Tested-by: Scot Doyle <lkml14@xxxxxxxxxxxxx> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/video/console/fbcon.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/video/console/fbcon.c +++ b/drivers/video/console/fbcon.c @@ -709,6 +709,7 @@ static int con2fb_acquire_newinfo(struct } if (!err) { + ops->cur_blink_jiffies = HZ / 5; info->fbcon_par = ops; if (vc) @@ -956,6 +957,7 @@ static const char *fbcon_startup(void) ops->currcon = -1; ops->graphics = 1; ops->cur_rotate = -1; + ops->cur_blink_jiffies = HZ / 5; info->fbcon_par = ops; p->con_rotate = initial_rotation; set_blitting_type(vc, info); Patches currently in stable-queue which might be from jean-philippe.brucker@xxxxxxx are queue-4.4/fbcon-set-a-default-value-to-blink-interval.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html