netdev - Re: [Bugme-new] [Bug 38102] New: BUG kmalloc-2048: Poison overwritten

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Date:	Tue, 05 Jul 2011 07:10:42 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexey Zaytsev <alexey.zaytsev@...il.com>
Cc:	Michael Büsch <m@...s.ch>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, Gary Zambrano <zambrano@...adcom.com>,
	bugme-daemon@...zilla.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Pekka Pietikainen <pp@...oulu.fi>,
	Florian Schirmer <jolt@...box.org>,
	Felix Fietkau <nbd@...nwrt.org>, Michael Buesch <mb@...sch.de>
Subject: Re: [Bugme-new] [Bug 38102] New: BUG kmalloc-2048: Poison
 overwritten

Le mardi 05 juillet 2011 à 08:57 +0400, Alexey Zaytsev a écrit :

> Ran tcpdump. You are right, I was wrong. Sorry for the noise.

Thanks for testing ;)

It would be nice to know if the memory scribbles start after or before
one RFO triggers.

I can see this calls b44_init_rings() without really stopping the device
before. This seems very suspect to me.



diff --git a/drivers/net/b44.c b/drivers/net/b44.c
index a69331e..b22dd4c 100644
--- a/drivers/net/b44.c
+++ b/drivers/net/b44.c
@@ -829,6 +829,7 @@ static int b44_rx(struct b44 *bp, int budget)
 	}
 
 	bp->rx_cons = cons;
+	wmb();
 	bw32(bp, B44_DMARX_PTR, cons * sizeof(struct dma_desc));
 
 	return received;
@@ -848,6 +849,7 @@ static int b44_poll(struct napi_struct *napi, int budget)
 		/* spin_unlock(&bp->tx_lock); */
 	}
 	if (bp->istat & ISTAT_RFO) {	/* fast recovery, in ~20msec */
+		pr_err("b44: ISTAT_RFO !\n");
 		bp->istat &= ~ISTAT_RFO;
 		b44_disable_ints(bp);
 		ssb_device_enable(bp->sdev, 0); /* resets ISTAT_RFO */
 


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