linux: initial micro2440 support for 2.6.29 using mini2440 kernel patches.

1 files changed, 54 insertions, 0 deletions

diff --git a/recipes/linux/linux-2.6.29/micro2440/0012-GRO-Disable-GRO-on-legacy-netif_rx-path.patch b/recipes/linux/linux-2.6.29/micro2440/0012-GRO-Disable-GRO-on-legacy-netif_rx-path.patch
new file mode 100644
index 0000000000..bfad6d80eb
--- /dev/null
+++ b/recipes/linux/linux-2.6.29/micro2440/0012-GRO-Disable-GRO-on-legacy-netif_rx-path.patch
@@ -0,0 +1,54 @@
+From 11c0b33d2a046a37bcd96528faa0e93359ef4a4b Mon Sep 17 00:00:00 2001
+From: Herbert Xu <herbert@gondor.apana.org.au>
+Date: Thu, 26 Mar 2009 00:59:10 -0700
+Subject: [PATCH] GRO: Disable GRO on legacy netif_rx path
+
+When I fixed the GRO crash in the legacy receive path I used
+napi_complete to replace __napi_complete.  Unfortunately they're
+not the same when NETPOLL is enabled, which may result in us
+not calling __napi_complete at all.
+
+What's more, we really do need to keep the __napi_complete call
+within the IRQ-off section since in theory an IRQ can occur in
+between and fill up the backlog to the maximum, causing us to
+lock up.
+
+Since we can't seem to find a fix that works properly right now,
+this patch reverts all the GRO support from the netif_rx path.
+
+Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+Signed-off-by: Michel Pollet <buserror@gmail.com>
+---
+ net/core/dev.c |    9 +++------
+ 1 files changed, 3 insertions(+), 6 deletions(-)
+
+diff --git a/net/core/dev.c b/net/core/dev.c
+index e3fe5c7..e438f54 100644
+--- a/net/core/dev.c
++++ b/net/core/dev.c
+@@ -2588,18 +2588,15 @@ static int process_backlog(struct napi_struct *napi, int quota)
+ 		local_irq_disable();
+ 		skb = __skb_dequeue(&queue->input_pkt_queue);
+ 		if (!skb) {
++			__napi_complete(napi);
+ 			local_irq_enable();
+-			napi_complete(napi);
+-			goto out;
++			break;
+ 		}
+ 		local_irq_enable();
+ 
+-		napi_gro_receive(napi, skb);
++		netif_receive_skb(skb);
+ 	} while (++work < quota && jiffies == start_time);
+ 
+-	napi_gro_flush(napi);
+-
+-out:
+ 	return work;
+ }
+ 
+-- 
+1.5.6.3
+