From: Chao Qin <chao.qin@xxxxxxxxx>
There is msleep in pr_flush(). If call WARN() in the early boot
stage such as in early_initcall, pr_flush() will run into msleep
when process scheduler is not ready yet. And then the system will
sleep forever.
Before the system_state is SYSTEM_RUNNING, make sure DO NOT sleep
in pr_flush().
Fixes: 63cf1e4b564a ("printk: add pr_flush()")
Signed-off-by: Chao Qin <chao.qin@xxxxxxxxx>
Signed-off-by: Lili Li <lili.li@xxxxxxxxx>
---
kernel/printk/printk.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 209d2392f0d8..a9b3afbdac39 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -3620,7 +3620,8 @@ bool pr_flush(int timeout_ms, bool reset_on_progress)
u64 diff;
u64 seq;
- may_sleep = (preemptible() && !in_softirq());
+ may_sleep = (preemptible() && !in_softirq()
+ && (system_state >= SYSTEM_RUNNING));
seq = prb_next_seq(prb);
base-commit: 7e175e6b59975c8901ad370f7818937f68de45c1
--
2.25.1
