linux-kernel - [29/71] can: fix SJA1000 dlc for RTR packets

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Date:	Thu, 19 May 2011 11:04:57 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Kurt Van Dijck <kurt.van.dijck@....be>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	"David S. Miller" <davem@...emloft.net>
Subject: [29/71] can: fix SJA1000 dlc for RTR packets

2.6.38-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Kurt Van Dijck <kurt.van.dijck@....be>

commit 87e9af6cc67d842cd92b52b81f3f14e665e7ab05 upstream.

RTR frames do have a valid data length code on CAN.
The driver for SJA1000 did not handle that situation properly.

Signed-off-by: Kurt Van Dijck <kurt.van.dijck@....be>
Acked-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/can/sja1000/sja1000.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -346,10 +346,10 @@ static void sja1000_rx(struct net_device
 		    | (priv->read_reg(priv, REG_ID2) >> 5);
 	}
 
+	cf->can_dlc = get_can_dlc(fi & 0x0F);
 	if (fi & FI_RTR) {
 		id |= CAN_RTR_FLAG;
 	} else {
-		cf->can_dlc = get_can_dlc(fi & 0x0F);
 		for (i = 0; i < cf->can_dlc; i++)
 			cf->data[i] = priv->read_reg(priv, dreg++);
 	}


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