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

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uartdrainoutput() might be called in early initialization
from uartctl() without a process.
This commit is contained in:
cinap_lenrek 2018-10-27 20:00:12 +02:00
parent d81f4d4866
commit 2ee4c08974
1 changed files with 1 additions and 2 deletions
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3
sys/src/9/port/devuart.c
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@ -318,9 +318,8 @@ uartdrained(void* arg)
static void
uartdrainoutput(Uart *p)
{
if(!p->enabled)
if(!p->enabled || up == nil || !islo())
return;
p->drain = 1;
if(waserror()){
p->drain = 0;