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net: mctp: usb: initialise mac header in RX path

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We're not currently setting skb->mac_header on ingress, and the netdev
core rx path expects it. Without it, we'll hit a warning on DEBUG_NETDEV
from commit 1e4033b53db4 ("net: skb_reset_mac_len() must check if
mac_header was set")

Initialise the mac_header to refer to the USB transport header.

Fixes: 0791c0327a6e ("net: mctp: Add MCTP USB transport driver")
Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
Link: https://patch.msgid.link/20250829-mctp-usb-mac-header-v1-1-338ad725e183@codeconstruct.com.au
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Jeremy Kerr 2025-08-29 15:40:23 +08:00 committed by Paolo Abeni
parent 773b27a8a2
commit e27e34bc99
1 changed files with 1 additions and 0 deletions
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drivers/net/mctp/mctp-usb.c
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@ -183,6 +183,7 @@ static void mctp_usb_in_complete(struct urb *urb)
struct mctp_usb_hdr *hdr;
u8 pkt_len; /* length of MCTP packet, no USB header */
skb_reset_mac_header(skb);
hdr = skb_pull_data(skb, sizeof(*hdr));
if (!hdr)
break;