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fixed interrupt problem with BCM driver on multicore machines

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

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

@@ -22,7 +22,7 @@

 typedef struct Ctlr Ctlr;

 struct Ctlr {

-	Lock txlock;

+	Lock txlock, imlock;

 	Ctlr *link;

 	Pcidev *pdev;

 	ulong *nic, *status;

@@ -404,6 +404,7 @@

 	edev = arg;

 	ctlr = edev->ctlr;

+	ilock(&ctlr->imlock);

 	dummyread(csr32(ctlr, InterruptMailbox));

 	csr32(ctlr, InterruptMailbox) = 1;

 	status = ctlr->status[0];

@@ -416,6 +417,7 @@

 	bcmtransclean(edev);

 	bcmtransmit(edev);

 	csr32(ctlr, InterruptMailbox) = tag << 24;

+	iunlock(&ctlr->imlock);

 }

 static void

@@ -664,5 +666,5 @@

 void

 etherbcmlink(void)

 {

-	addethercard("BCM57xx", bcmpnp);

+	addethercard("BCM5755", bcmpnp);

 }

-- 

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