linux-kernel - [PATCH 3.2 213/221] gianfar: Carefully free skbs in functions called by netpoll.

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Date:	Tue, 05 May 2015 02:16:39 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.2 213/221] gianfar: Carefully free skbs in functions
 called by  netpoll.

3.2.69-rc1 review patch.  If anyone has any objections, please let me know.

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

From: "Eric W. Biederman" <ebiederm@...ssion.com>

commit c9974ad4aeb36003860100221a594f3c0ccc3f78 upstream.

netpoll can call functions in hard irq context that are ordinarily
called in lesser contexts.  For those functions use dev_kfree_skb_any
and dev_consume_skb_any so skbs are freed safely from hard irq
context.

Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
[bwh: Backported to 3.2: use only dev_kfree_skb() and not dev_consume_skb_any()]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/ethernet/freescale/gianfar.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -2092,10 +2092,10 @@ static int gfar_start_xmit(struct sk_buf
 		skb_new = skb_realloc_headroom(skb, GMAC_FCB_LEN);
 		if (!skb_new) {
 			dev->stats.tx_errors++;
-			kfree_skb(skb);
+			dev_kfree_skb_any(skb);
 			return NETDEV_TX_OK;
 		}
-		kfree_skb(skb);
+		dev_kfree_skb_any(skb);
 		skb = skb_new;
 	}
 

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