The patch titled
fbcon: fix workqueue shutdown
has been added to the -mm tree. Its filename is
fbcon-fix-workqueue-shutdown-update.patch
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------------------------------------------------------
Subject: fbcon: fix workqueue shutdown
From: Geoff Levand <geoffrey.levand@xxxxxxxxxxx>
Add a call to cancel_work_sync() in fbcon_exit() to cancel any pending
work in the fbcon workqueue.
The current implementation of fbcon_exit() sets the fbcon workqueue
function info->queue.func to NULL, but does not assure that there is no
work pending when it does so. On occasion, depending on system timing,
there will still be pending work in the queue when fbcon_exit() is
called. This results in a null pointer deference when run_workqueue()
tries to call the queue's work function.
Fixes errors on shutdown similar to these:
Console: switching to colour dummy device 80x25
Unable to handle kernel paging request for data at address 0x00000000
Signed-off-by: Geoff Levand <geoffrey.levand@xxxxxxxxxxx>
Cc: Krzysztof Helt <krzysztof.h1@xxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/video/console/fbcon.c | 6 ++++++
1 file changed, 6 insertions(+)
diff -puN drivers/video/console/fbcon.c~fbcon-fix-workqueue-shutdown-update drivers/video/console/fbcon.c
--- a/drivers/video/console/fbcon.c~fbcon-fix-workqueue-shutdown-update
+++ a/drivers/video/console/fbcon.c
@@ -3531,12 +3531,18 @@ static void fbcon_exit(void)
softback_buf = 0UL;
for (i = 0; i < FB_MAX; i++) {
+ int pending;
+
mapped = 0;
info = registered_fb[i];
if (info == NULL)
continue;
+ pending = cancel_work_sync(&info->queue);
+ DPRINTK("fbcon: %s pending work\n", (pending ? "canceled" :
+ "no"));
+
for (j = first_fb_vc; j <= last_fb_vc; j++) {
if (con2fb_map[j] == i)
mapped = 1;
_
Patches currently in -mm which might be from geoffrey.levand@xxxxxxxxxxx are
fbcon-fix-workqueue-shutdown-update.patch
linux-next.patch
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