[WATCHDOG] hpwdt: Fix kdump when using hpwdt
authorBernhard Walle <bwalle@suse.de>
Sun, 26 Oct 2008 14:59:37 +0000 (15:59 +0100)
committerWim Van Sebroeck <wim@iguana.be>
Mon, 1 Dec 2008 15:55:10 +0000 (15:55 +0000)
commit290172e79036fc25a22aaf3da4835ee634886183
tree9cbfb01fdbb4a390b84c1e929e55b38e0cae648a
parent060264133b946786b4b28a1ba79e6725eaf258f3
[WATCHDOG] hpwdt: Fix kdump when using hpwdt

When the "hpwdt" module is loaded (even if the /dev/watchdog device is not
opened), then kdump does not work. The panic kernel either does not start at
all or crash in various places.

The problem is that hpwdt_pretimeout is registered with register_die_notifier()
with the highest possible priority. Because it returns NOTIFY_STOP, the
crash_nmi_callback which is also registered with register_die_notifier()
is never executed. This causes the shutdown of other CPUs to fail.

Reverting the order is no option: The crash_nmi_callback executes HLT
and so never returns normally. Because of that, it must be executed as
last notifier, which currently is done.

So, that patch returns NOTIFY_OK to keep the crash_nmi_callback executed.

Signed-off-by: Bernhard Walle <bwalle@suse.de>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Thomas Mingarelli <thomas.mingarelli@hp.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
drivers/watchdog/hpwdt.c