64 lines
1.7 KiB
Diff
64 lines
1.7 KiB
Diff
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From 2c96c2eabfe092f7b1ada3827737009ee84cb60f Mon Sep 17 00:00:00 2001
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From: Jake Day <jake@ninebysix.com>
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Date: Sun, 27 Jan 2019 10:45:42 -0500
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Subject: [PATCH 02/11] resume-delay
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---
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kernel/power/suspend.c | 11 +++++++++++
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kernel/sysctl.c | 9 +++++++++
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2 files changed, 20 insertions(+)
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diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
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index 0bd595a0b610..a8385e8894a5 100644
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--- a/kernel/power/suspend.c
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+++ b/kernel/power/suspend.c
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@@ -526,6 +526,8 @@ int suspend_devices_and_enter(suspend_state_t state)
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goto Resume_devices;
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}
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+unsigned int resume_delay = 3000;
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+
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/**
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* suspend_finish - Clean up before finishing the suspend sequence.
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*
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@@ -534,6 +536,15 @@ int suspend_devices_and_enter(suspend_state_t state)
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*/
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static void suspend_finish(void)
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{
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+ if (resume_delay) {
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+ /* Give kernel threads a head start, such that usb-storage
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+ * can detect devices before syslog attempts to write log
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+ * messages from the suspend code.
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+ */
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+ thaw_kernel_threads();
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+ pr_debug("PM: Sleeping for %d milliseconds.\n", resume_delay);
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+ msleep(resume_delay);
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+ }
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suspend_thaw_processes();
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pm_notifier_call_chain(PM_POST_SUSPEND);
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pm_restore_console();
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diff --git a/kernel/sysctl.c b/kernel/sysctl.c
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index cc02050fd0c4..11802bda1a5d 100644
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--- a/kernel/sysctl.c
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+++ b/kernel/sysctl.c
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@@ -311,7 +311,16 @@ static int min_extfrag_threshold;
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static int max_extfrag_threshold = 1000;
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#endif
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+extern unsigned int resume_delay;
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+
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static struct ctl_table kern_table[] = {
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+ {
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+ .procname = "resume_delay",
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+ .data = &resume_delay,
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+ .maxlen = sizeof(unsigned int),
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+ .mode = 0644,
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+ .proc_handler = proc_dointvec,
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+ },
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{
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.procname = "sched_child_runs_first",
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.data = &sysctl_sched_child_runs_first,
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--
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2.17.1
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