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etheriwl: recover from rfkill toggle or firmware crash

spawn a kernel process to check the broken state of the controller.
if the firmware crashed, or rfkill was toggled we will reset and
reboot the firmware. also power down the card when rfkill is off.

--- a/sys/src/9/pc/etheriwl.c

+++ b/sys/src/9/pc/etheriwl.c

@@ -1990,6 +1990,46 @@

 }

 static void

+iwlrecover(void *arg)

+{

+	Ether *edev;

+	Ctlr *ctlr;

+

+	edev = arg;

+	ctlr = edev->ctlr;

+	for(;;){

+		while(waserror())

+			;

+		tsleep(&up->sleep, return0, 0, 4000);

+		poperror();

+

+		qlock(ctlr);

+		for(;;){

+			if(ctlr->broken == 0)

+				break;

+

+			if(ctlr->power)

+				poweroff(ctlr);

+

+			if((csr32r(ctlr, Gpc) & RfKill) == 0)

+				break;

+

+			if(reset(ctlr) != nil)

+				break;

+			if(boot(ctlr) != nil)

+				break;

+

+			ctlr->bcastnodeid = -1;

+			ctlr->bssnodeid = -1;

+			ctlr->aid = 0;

+			rxon(edev, ctlr->wifi->bss);

+			break;

+		}

+		qunlock(ctlr);

+	}

+}

+

+static void

 iwlattach(Ether *edev)

 {

 	FWImage *fw;

@@ -2037,6 +2077,8 @@

 		setoptions(edev);

 		ctlr->attached = 1;

+

+		kproc("iwlrecover", iwlrecover, edev);

 	}

 	qunlock(ctlr);

 	poperror();

@@ -2188,7 +2230,7 @@

 		receive(ctlr);

 	if(isr & Ierr){

 		ctlr->broken = 1;

-		iprint("#l%d: fatal firmware error\n", edev->ctlrno);

+		print("#l%d: fatal firmware error\n", edev->ctlrno);

 		dumpctlr(ctlr);

 	}

 	ctlr->wait.m |= isr;

-- 

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