shithub: riscv

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ref: 2ee4c089741823aae794eaa2eb53780f65019981
parent: d81f4d4866ac6084d8268880fa36bec3ece460c1
author: cinap_lenrek <[email protected]>
date: Sat Oct 27 16:00:12 EDT 2018

devuart: don't sleep in uartdrainoutput() when called splhi or without a process

uartdrainoutput() might be called in early initialization
from uartctl() without a process.

--- a/sys/src/9/port/devuart.c

+++ b/sys/src/9/port/devuart.c

@@ -318,9 +318,8 @@

 static void

 uartdrainoutput(Uart *p)

 {

-	if(!p->enabled)

+	if(!p->enabled || up == nil || !islo())

 		return;

-

 	p->drain = 1;

 	if(waserror()){

 		p->drain = 0;