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authorThomas Sailer <t.sailer@alumni.ethz.ch>2007-10-24 00:47:19 +0200
committerJeff Garzik <jeff@garzik.org>2007-10-25 03:34:59 -0400
commit500d2c2f7b8c1cf6194dc9e8f47c6e2295fc5be5 (patch)
treeb35d2b2243f78e944848d5853d51d8530b6e6fad /drivers/net/usb
parentb88219f8a2028a1ca2dd17aa7c9d9b643615646e (diff)
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 <t.sailer@alumni.ethz.ch> Acked-by: David Brownell <dbrownell@users.sourceforge.net> -- 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 <jeff@garzik.org>
Diffstat (limited to 'drivers/net/usb')
-rw-r--r--drivers/net/usb/rndis_host.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/drivers/net/usb/rndis_host.c b/drivers/net/usb/rndis_host.c
index cd991a0f75b..1ebe3259be0 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 ... */