Commit 9745cdb3 authored by Colin Cross's avatar Colin Cross Committed by Rafael J. Wysocki

select: use freezable blocking call

Avoid waking up every thread sleeping in a select call during
suspend and resume by calling a freezable blocking call.  Previous
patches modified the freezer to avoid sending wakeups to threads
that are blocked in freezable blocking calls.

This call was selected to be converted to a freezable call because
it doesn't hold any locks or release any resources when interrupted
that might be needed by another freezing task or a kernel driver
during suspend, and is a common site where idle userspace tasks are
blocked.
Acked-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarColin Cross <ccross@android.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 1c441e92
...@@ -27,6 +27,7 @@ ...@@ -27,6 +27,7 @@
#include <linux/rcupdate.h> #include <linux/rcupdate.h>
#include <linux/hrtimer.h> #include <linux/hrtimer.h>
#include <linux/sched/rt.h> #include <linux/sched/rt.h>
#include <linux/freezer.h>
#include <asm/uaccess.h> #include <asm/uaccess.h>
...@@ -236,7 +237,8 @@ int poll_schedule_timeout(struct poll_wqueues *pwq, int state, ...@@ -236,7 +237,8 @@ int poll_schedule_timeout(struct poll_wqueues *pwq, int state,
set_current_state(state); set_current_state(state);
if (!pwq->triggered) if (!pwq->triggered)
rc = schedule_hrtimeout_range(expires, slack, HRTIMER_MODE_ABS); rc = freezable_schedule_hrtimeout_range(expires, slack,
HRTIMER_MODE_ABS);
__set_current_state(TASK_RUNNING); __set_current_state(TASK_RUNNING);
/* /*
......
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