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net: wwan: mhi_wwan_mbim: Avoid -Wflex-array-member-not-at-end warning 

Use DEFINE_RAW_FLEX() to avoid a -Wflex-array-member-not-at-end warning.

Remove fixed-size array struct usb_cdc_ncm_dpe16 dpe16[2]; from struct
mbim_tx_hdr, so that flex-array member struct mbim_tx_hdr::ndp16.dpe16[]
ends last in this structure.

Compensate for this by using the DEFINE_RAW_FLEX() helper to declare the
on-stack struct instance that contains struct usb_cdc_ncm_ndp16 as a
member. Adjust the rest of the code, accordingly.

So, with these changes fix the following warning:

drivers/net/wwan/mhi_wwan_mbim.c:81:34: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Reviewed-by: Loic Poulain <loic.poulain@oss.qualcomm.com>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Gustavo A. R. Silva 2025-11-27 12:12:03 +09:00 committed by Jakub Kicinski
parent 858b1d07e4
commit eeecf5d3a3
1 changed files with 9 additions and 8 deletions
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17
drivers/net/wwan/mhi_wwan_mbim.c
View File

@ -78,8 +78,9 @@ struct mhi_mbim_context {
struct mbim_tx_hdr {
struct usb_cdc_ncm_nth16 nth16;
/* Must be last as it ends in a flexible-array member. */
struct usb_cdc_ncm_ndp16 ndp16;
struct usb_cdc_ncm_dpe16 dpe16[2];
} __packed;
static struct mhi_mbim_link *mhi_mbim_get_link_rcu(struct mhi_mbim_context *mbim,
@ -107,20 +108,20 @@ static int mhi_mbim_get_link_mux_id(struct mhi_controller *cntrl)
static struct sk_buff *mbim_tx_fixup(struct sk_buff *skb, unsigned int session,
u16 tx_seq)
{
DEFINE_RAW_FLEX(struct mbim_tx_hdr, mbim_hdr, ndp16.dpe16, 2);
unsigned int dgram_size = skb->len;
struct usb_cdc_ncm_nth16 *nth16;
struct usb_cdc_ncm_ndp16 *ndp16;
struct mbim_tx_hdr *mbim_hdr;
/* Only one NDP is sent, containing the IP packet (no aggregation) */
/* Ensure we have enough headroom for crafting MBIM header */
if (skb_cow_head(skb, sizeof(struct mbim_tx_hdr))) {
if (skb_cow_head(skb, __struct_size(mbim_hdr))) {
dev_kfree_skb_any(skb);
return NULL;
}
mbim_hdr = skb_push(skb, sizeof(struct mbim_tx_hdr));
mbim_hdr = skb_push(skb, __struct_size(mbim_hdr));
/* Fill NTB header */
nth16 = &mbim_hdr->nth16;
@ -133,12 +134,11 @@ static struct sk_buff *mbim_tx_fixup(struct sk_buff *skb, unsigned int session,
/* Fill the unique NDP */
ndp16 = &mbim_hdr->ndp16;
ndp16->dwSignature = cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN | (session << 24));
ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16)
+ sizeof(struct usb_cdc_ncm_dpe16) * 2);
ndp16->wLength = cpu_to_le16(struct_size(ndp16, dpe16, 2));
ndp16->wNextNdpIndex = 0;
/* Datagram follows the mbim header */
ndp16->dpe16[0].wDatagramIndex = cpu_to_le16(sizeof(struct mbim_tx_hdr));
ndp16->dpe16[0].wDatagramIndex = cpu_to_le16(__struct_size(mbim_hdr));
ndp16->dpe16[0].wDatagramLength = cpu_to_le16(dgram_size);
/* null termination */
@ -584,7 +584,8 @@ static void mhi_mbim_setup(struct net_device *ndev)
{
ndev->header_ops = NULL; /* No header */
ndev->type = ARPHRD_RAWIP;
ndev->needed_headroom = sizeof(struct mbim_tx_hdr);
ndev->needed_headroom =
struct_size_t(struct mbim_tx_hdr, ndp16.dpe16, 2);
ndev->hard_header_len = 0;
ndev->addr_len = 0;
ndev->flags = IFF_POINTOPOINT | IFF_NOARP;