From 500d2c2f7b8c1cf6194dc9e8f47c6e2295fc5be5 Mon Sep 17 00:00:00 2001 From: Thomas Sailer Date: Wed, 24 Oct 2007 00:47:19 +0200 Subject: [PATCH] rndis_host: reduce MTU instead of refusing to talk to devices with low max packet size 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. Signed-Off-by: Thomas Sailer Acked-by: David Brownell -- Hi Jeff, are you the right person to send this to? Nobody else seems to be wanting to forward this to Linus... Thanks, Tom Signed-off-by: Jeff Garzik --- drivers/net/usb/rndis_host.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) diff --git a/drivers/net/usb/rndis_host.c b/drivers/net/usb/rndis_host.c index cd991a0f75..1ebe3259be 100644 --- a/drivers/net/usb/rndis_host.c +++ b/drivers/net/usb/rndis_host.c @@ -512,11 +512,19 @@ static int rndis_bind(struct usbnet *dev, struct usb_interface *intf) } 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_err(&intf->dev, + "dev can't take %u byte packets (max %u)\n", + dev->hard_mtu, 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 ... */ -- 2.39.5