kpriv/linux-hardened
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

watchdog: octeon: Handle the FROZEN hot plug notifier actions.

Browse source 
When performing a suspend operation, the kernel brings all of the
non-boot CPUs offline, calling the hot plug notifiers with the flag,
CPU_TASKS_FROZEN, set in the action code.  Similarly, during resume,
the CPUs are brought back online, but again the notifiers have the
FROZEN flag set.

While some very few drivers really need to treat suspend/resume
specially, this driver unintentionally ignores the notifications.

This patch changes the driver to disable the watchdog interrupt
whenever the CPU goes offline, and to enable it whenever the CPU goes
back online.  As a result, the suspended state is no longer a special
case that leaves the watchdog active.

Signed-off-by: Richard Cochran <rcochran@linutronix.de>
Cc: linux-watchdog@vger.kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Richard Cochran 2016-03-18 22:26:08 +01:00 committed by Wim Van Sebroeck
parent b6ef36d2c1
commit ebbf677a3f
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/watchdog/octeon-wdt-main.c
View file

@ -431,7 +431,7 @@ static int octeon_wdt_cpu_callback(struct notifier_block *nfb,
{
unsigned int cpu = (unsigned long)hcpu;
switch (action) {
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_DOWN_PREPARE:
octeon_wdt_disable_interrupt(cpu);
break;