[PATCH 3.18 039/150] brcmfmac: Fix ifidx for rx data by msgbuf.

[Greg Kroah-Hartman]

3.18-stable review patch.  If anyone has any objections, please let me know.

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

From: Hante Meuleman <meuleman@xxxxxxxxxxxx>

commit 94a612086f5e78272e831c04b673778f8546ea73 upstream.

The ifidx provided by FW needs to be offsetted when receiving data
packets.

Reviewed-by: Arend Van Spriel <arend@xxxxxxxxxxxx>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@xxxxxxxxxxxx>
Signed-off-by: Hante Meuleman <meuleman@xxxxxxxxxxxx>
Signed-off-by: Arend van Spriel <arend@xxxxxxxxxxxx>
Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/net/wireless/brcm80211/brcmfmac/msgbuf.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/net/wireless/brcm80211/brcmfmac/msgbuf.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/msgbuf.c
@@ -1081,8 +1081,17 @@ brcmf_msgbuf_rx_skb(struct brcmf_msgbuf
 {
 	struct brcmf_if *ifp;
 
+	/* The ifidx is the idx to map to matching netdev/ifp. When receiving
+	 * events this is easy because it contains the bssidx which maps
+	 * 1-on-1 to the netdev/ifp. But for data frames the ifidx is rcvd.
+	 * bssidx 1 is used for p2p0 and no data can be received or
+	 * transmitted on it. Therefor bssidx is ifidx + 1 if ifidx > 0
+	 */
+	if (ifidx)
+		(ifidx)++;
 	ifp = msgbuf->drvr->iflist[ifidx];
 	if (!ifp || !ifp->ndev) {
+		brcmf_err("Received pkt for invalid ifidx %d\n", ifidx);
 		brcmu_pkt_buf_free_skb(skb);
 		return;
 	}


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