[RESEND]: RNDIS host: adjust MTU instead of refusing to talk to devices with MTU < 1.5k

This patch makes the host RNDIS driver talk to RNDIS devices with an MTU
less than 1.5k, instead of refusing to talk to such a device.
Please apply.

Signed-Off-by: Thomas Sailer <[email protected]>

--- 1/drivers/net/usb/rndis_host.c.orig	2007-09-04 17:51:11.000000000 +0200
+++ 2/drivers/net/usb/rndis_host.c	2007-09-04 17:54:26.000000000 +0200
@@ -512,11 +512,18 @@
 	}
 	tmp = le32_to_cpu(u.init_c->max_transfer_size);
 	if (tmp < dev->hard_mtu) {
-		dev_err(&intf->dev,
-			"dev can't take %u byte packets (max %u)\n",
-			dev->hard_mtu, tmp);
-		retval = -EINVAL;
-		goto fail_and_release;
+		if (tmp <= net->hard_header_len) {
+			dev_warn(&intf->dev,
+				 "dev can't take %u byte packets (max %u)\n",
+				 net->hard_header_len+1, tmp);
+			retval = -EINVAL;
+			goto fail_and_release;
+		}
+		dev->hard_mtu = tmp;
+		net->mtu = dev->hard_mtu - net->hard_header_len;
+		dev_warn(&intf->dev,
+			 "dev can't take %u byte packets (max %u), adjusting MTU to %u\n",
+			 dev->hard_mtu, tmp, net->mtu);
 	}
 
 	/* REVISIT:  peripheral "alignment" request is ignored ... */



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