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wifi: mwl8k: Avoid -Wflex-array-member-not-at-end warnings
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-Wflex-array-member-not-at-end is coming in GCC-14, and we are getting
ready to enable it globally.

There is currently an object (`header`), at the beginning of multiple
structures, that contains a flexible structure (`struct mwl8k_cmd_pkt`),
for example:

struct mwl8k_cmd_get_hw_spec_sta {
        struct mwl8k_cmd_pkt header;

	...

	__le32 num_tx_desc_per_queue;
        __le32 total_rxd;
} __packed;

So, in order to avoid ending up with flexible-array members in the
middle of multiple other structs, we use the `__struct_group()` helper
to separate the flexible array from the rest of the members in the
flexible structure:

struct mwl8k_cmd_pkt {
        __struct_group(mwl8k_cmd_pkt_hdr, hdr, __packed,

	... the rest of the members

        );
        char payload[];
} __packed;

With the change described above, we now declare objects of the type of
the tagged struct, in this case `struct mwl8k_cmd_pkt_hdr`, without
embedding flexible arrays in the middle of another struct:

struct mwl8k_cmd_get_hw_spec_sta {
        struct mwl8k_cmd_pkt_hdr header;

        ...

        __le32 num_tx_desc_per_queue;
        __le32 total_rxd;
} __packed;

Also, update the type of a couple of variables and function parameters
from `struct mwl8k_cmd_pkt` to `struct mwl8k_cmd_pkt_hdr`.

So, with these changes, fix 33 of the following warnings[1]:
drivers/net/wireless/marvell/mwl8k.c:2353:30: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Link: https://gist.github.com/GustavoARSilva/7a841a92c0f24e5efdb30ce02b601eb8 [1]
Link: https://github.com/KSPP/linux/issues/202
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/ZgDrhe5pbV/WvDiZ@neat
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Gustavo A. R. Silva authored and Kalle Valo committed Mar 28, 2024
1 parent f4b09b2 commit 5c42500
Showing 1 changed file with 47 additions and 45 deletions.
92 changes: 47 additions & 45 deletions drivers/net/wireless/marvell/mwl8k.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -587,12 +587,14 @@ static int mwl8k_request_firmware(struct mwl8k_priv *priv, char *fw_image,
}

struct mwl8k_cmd_pkt {
__le16 code;
__le16 length;
__u8 seq_num;
__u8 macid;
__le16 result;
char payload[];
__struct_group(mwl8k_cmd_pkt_hdr, hdr, __packed,
__le16 code;
__le16 length;
__u8 seq_num;
__u8 macid;
__le16 result;
);
char payload[];
} __packed;

/*
Expand Down Expand Up @@ -2201,7 +2203,7 @@ static void mwl8k_enable_bsses(struct ieee80211_hw *hw, bool enable,
/* Timeout firmware commands after 10s */
#define MWL8K_CMD_TIMEOUT_MS 10000

static int mwl8k_post_cmd(struct ieee80211_hw *hw, struct mwl8k_cmd_pkt *cmd)
static int mwl8k_post_cmd(struct ieee80211_hw *hw, struct mwl8k_cmd_pkt_hdr *cmd)
{
DECLARE_COMPLETION_ONSTACK(cmd_wait);
struct mwl8k_priv *priv = hw->priv;
Expand Down Expand Up @@ -2298,7 +2300,7 @@ static int mwl8k_post_cmd(struct ieee80211_hw *hw, struct mwl8k_cmd_pkt *cmd)

static int mwl8k_post_pervif_cmd(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct mwl8k_cmd_pkt *cmd)
struct mwl8k_cmd_pkt_hdr *cmd)
{
if (vif != NULL)
cmd->macid = MWL8K_VIF(vif)->macid;
Expand Down Expand Up @@ -2350,7 +2352,7 @@ static void mwl8k_setup_5ghz_band(struct ieee80211_hw *hw)
* CMD_GET_HW_SPEC (STA version).
*/
struct mwl8k_cmd_get_hw_spec_sta {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__u8 hw_rev;
__u8 host_interface;
__le16 num_mcaddrs;
Expand Down Expand Up @@ -2499,7 +2501,7 @@ static int mwl8k_cmd_get_hw_spec_sta(struct ieee80211_hw *hw)
* CMD_GET_HW_SPEC (AP version).
*/
struct mwl8k_cmd_get_hw_spec_ap {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__u8 hw_rev;
__u8 host_interface;
__le16 num_wcb;
Expand Down Expand Up @@ -2593,7 +2595,7 @@ static int mwl8k_cmd_get_hw_spec_ap(struct ieee80211_hw *hw)
* CMD_SET_HW_SPEC.
*/
struct mwl8k_cmd_set_hw_spec {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__u8 hw_rev;
__u8 host_interface;
__le16 num_mcaddrs;
Expand Down Expand Up @@ -2670,7 +2672,7 @@ static int mwl8k_cmd_set_hw_spec(struct ieee80211_hw *hw)
* CMD_MAC_MULTICAST_ADR.
*/
struct mwl8k_cmd_mac_multicast_adr {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le16 action;
__le16 numaddr;
__u8 addr[][ETH_ALEN];
Expand All @@ -2681,7 +2683,7 @@ struct mwl8k_cmd_mac_multicast_adr {
#define MWL8K_ENABLE_RX_ALL_MULTICAST 0x0004
#define MWL8K_ENABLE_RX_BROADCAST 0x0008

static struct mwl8k_cmd_pkt *
static struct mwl8k_cmd_pkt_hdr *
__mwl8k_cmd_mac_multicast_adr(struct ieee80211_hw *hw, int allmulti,
struct netdev_hw_addr_list *mc_list)
{
Expand Down Expand Up @@ -2729,7 +2731,7 @@ __mwl8k_cmd_mac_multicast_adr(struct ieee80211_hw *hw, int allmulti,
* CMD_GET_STAT.
*/
struct mwl8k_cmd_get_stat {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le32 stats[64];
} __packed;

Expand Down Expand Up @@ -2771,7 +2773,7 @@ static int mwl8k_cmd_get_stat(struct ieee80211_hw *hw,
* CMD_RADIO_CONTROL.
*/
struct mwl8k_cmd_radio_control {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le16 action;
__le16 control;
__le16 radio_on;
Expand Down Expand Up @@ -2832,7 +2834,7 @@ mwl8k_set_radio_preamble(struct ieee80211_hw *hw, bool short_preamble)
#define MWL8K_RF_TX_POWER_LEVEL_TOTAL 8

struct mwl8k_cmd_rf_tx_power {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le16 action;
__le16 support_level;
__le16 current_level;
Expand Down Expand Up @@ -2866,7 +2868,7 @@ static int mwl8k_cmd_rf_tx_power(struct ieee80211_hw *hw, int dBm)
#define MWL8K_TX_POWER_LEVEL_TOTAL 12

struct mwl8k_cmd_tx_power {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le16 action;
__le16 band;
__le16 channel;
Expand Down Expand Up @@ -2925,7 +2927,7 @@ static int mwl8k_cmd_tx_power(struct ieee80211_hw *hw,
* CMD_RF_ANTENNA.
*/
struct mwl8k_cmd_rf_antenna {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le16 antenna;
__le16 mode;
} __packed;
Expand Down Expand Up @@ -2958,7 +2960,7 @@ mwl8k_cmd_rf_antenna(struct ieee80211_hw *hw, int antenna, int mask)
* CMD_SET_BEACON.
*/
struct mwl8k_cmd_set_beacon {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le16 beacon_len;
__u8 beacon[];
};
Expand Down Expand Up @@ -2988,7 +2990,7 @@ static int mwl8k_cmd_set_beacon(struct ieee80211_hw *hw,
* CMD_SET_PRE_SCAN.
*/
struct mwl8k_cmd_set_pre_scan {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
} __packed;

static int mwl8k_cmd_set_pre_scan(struct ieee80211_hw *hw)
Expand All @@ -3013,7 +3015,7 @@ static int mwl8k_cmd_set_pre_scan(struct ieee80211_hw *hw)
* CMD_BBP_REG_ACCESS.
*/
struct mwl8k_cmd_bbp_reg_access {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le16 action;
__le16 offset;
u8 value;
Expand Down Expand Up @@ -3054,7 +3056,7 @@ mwl8k_cmd_bbp_reg_access(struct ieee80211_hw *hw,
* CMD_SET_POST_SCAN.
*/
struct mwl8k_cmd_set_post_scan {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le32 isibss;
__u8 bssid[ETH_ALEN];
} __packed;
Expand Down Expand Up @@ -3142,7 +3144,7 @@ static void mwl8k_update_survey(struct mwl8k_priv *priv,
* CMD_SET_RF_CHANNEL.
*/
struct mwl8k_cmd_set_rf_channel {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le16 action;
__u8 current_channel;
__le32 channel_flags;
Expand Down Expand Up @@ -3211,7 +3213,7 @@ static int mwl8k_cmd_set_rf_channel(struct ieee80211_hw *hw,
#define MWL8K_FRAME_PROT_11N_HT_ALL 0x06

struct mwl8k_cmd_update_set_aid {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le16 aid;

/* AP's MAC address (BSSID) */
Expand Down Expand Up @@ -3283,7 +3285,7 @@ mwl8k_cmd_set_aid(struct ieee80211_hw *hw,
* CMD_SET_RATE.
*/
struct mwl8k_cmd_set_rate {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__u8 legacy_rates[14];

/* Bitmap for supported MCS codes. */
Expand Down Expand Up @@ -3319,7 +3321,7 @@ mwl8k_cmd_set_rate(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
#define MWL8K_FJ_BEACON_MAXLEN 128

struct mwl8k_cmd_finalize_join {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le32 sleep_interval; /* Number of beacon periods to sleep */
__u8 beacon_data[MWL8K_FJ_BEACON_MAXLEN];
} __packed;
Expand Down Expand Up @@ -3358,7 +3360,7 @@ static int mwl8k_cmd_finalize_join(struct ieee80211_hw *hw, void *frame,
* CMD_SET_RTS_THRESHOLD.
*/
struct mwl8k_cmd_set_rts_threshold {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le16 action;
__le16 threshold;
} __packed;
Expand Down Expand Up @@ -3388,7 +3390,7 @@ mwl8k_cmd_set_rts_threshold(struct ieee80211_hw *hw, int rts_thresh)
* CMD_SET_SLOT.
*/
struct mwl8k_cmd_set_slot {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le16 action;
__u8 short_slot;
} __packed;
Expand Down Expand Up @@ -3417,7 +3419,7 @@ static int mwl8k_cmd_set_slot(struct ieee80211_hw *hw, bool short_slot_time)
* CMD_SET_EDCA_PARAMS.
*/
struct mwl8k_cmd_set_edca_params {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;

/* See MWL8K_SET_EDCA_XXX below */
__le16 action;
Expand Down Expand Up @@ -3502,7 +3504,7 @@ mwl8k_cmd_set_edca_params(struct ieee80211_hw *hw, __u8 qnum,
* CMD_SET_WMM_MODE.
*/
struct mwl8k_cmd_set_wmm_mode {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le16 action;
} __packed;

Expand Down Expand Up @@ -3533,7 +3535,7 @@ static int mwl8k_cmd_set_wmm_mode(struct ieee80211_hw *hw, bool enable)
* CMD_MIMO_CONFIG.
*/
struct mwl8k_cmd_mimo_config {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le32 action;
__u8 rx_antenna_map;
__u8 tx_antenna_map;
Expand Down Expand Up @@ -3564,7 +3566,7 @@ static int mwl8k_cmd_mimo_config(struct ieee80211_hw *hw, __u8 rx, __u8 tx)
* CMD_USE_FIXED_RATE (STA version).
*/
struct mwl8k_cmd_use_fixed_rate_sta {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le32 action;
__le32 allow_rate_drop;
__le32 num_rates;
Expand Down Expand Up @@ -3606,7 +3608,7 @@ static int mwl8k_cmd_use_fixed_rate_sta(struct ieee80211_hw *hw)
* CMD_USE_FIXED_RATE (AP version).
*/
struct mwl8k_cmd_use_fixed_rate_ap {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le32 action;
__le32 allow_rate_drop;
__le32 num_rates;
Expand Down Expand Up @@ -3647,7 +3649,7 @@ mwl8k_cmd_use_fixed_rate_ap(struct ieee80211_hw *hw, int mcast, int mgmt)
* CMD_ENABLE_SNIFFER.
*/
struct mwl8k_cmd_enable_sniffer {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le32 action;
} __packed;

Expand All @@ -3671,7 +3673,7 @@ static int mwl8k_cmd_enable_sniffer(struct ieee80211_hw *hw, bool enable)
}

struct mwl8k_cmd_update_mac_addr {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
union {
struct {
__le16 mac_type;
Expand Down Expand Up @@ -3756,7 +3758,7 @@ static inline int mwl8k_cmd_del_mac_addr(struct ieee80211_hw *hw,
* CMD_SET_RATEADAPT_MODE.
*/
struct mwl8k_cmd_set_rate_adapt_mode {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le16 action;
__le16 mode;
} __packed;
Expand Down Expand Up @@ -3785,7 +3787,7 @@ static int mwl8k_cmd_set_rateadapt_mode(struct ieee80211_hw *hw, __u16 mode)
* CMD_GET_WATCHDOG_BITMAP.
*/
struct mwl8k_cmd_get_watchdog_bitmap {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
u8 bitmap;
} __packed;

Expand Down Expand Up @@ -3865,7 +3867,7 @@ static void mwl8k_watchdog_ba_events(struct work_struct *work)
* CMD_BSS_START.
*/
struct mwl8k_cmd_bss_start {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le32 enable;
} __packed;

Expand Down Expand Up @@ -3960,7 +3962,7 @@ struct mwl8k_destroy_ba_stream {
} __packed;

struct mwl8k_cmd_bastream {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le32 action;
union {
struct mwl8k_create_ba_stream create_params;
Expand Down Expand Up @@ -4070,7 +4072,7 @@ static void mwl8k_destroy_ba(struct ieee80211_hw *hw,
* CMD_SET_NEW_STN.
*/
struct mwl8k_cmd_set_new_stn {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;
__le16 aid;
__u8 mac_addr[6];
__le16 stn_id;
Expand Down Expand Up @@ -4206,7 +4208,7 @@ static int mwl8k_cmd_set_new_stn_del(struct ieee80211_hw *hw,
#define MIC_KEY_LENGTH 8

struct mwl8k_cmd_update_encryption {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;

__le32 action;
__le32 reserved;
Expand All @@ -4216,7 +4218,7 @@ struct mwl8k_cmd_update_encryption {
} __packed;

struct mwl8k_cmd_set_key {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;

__le32 action;
__le32 reserved;
Expand Down Expand Up @@ -4504,7 +4506,7 @@ struct peer_capability_info {
} __packed;

struct mwl8k_cmd_update_stadb {
struct mwl8k_cmd_pkt header;
struct mwl8k_cmd_pkt_hdr header;

/* See STADB_ACTION_TYPE */
__le32 action;
Expand Down Expand Up @@ -5174,7 +5176,7 @@ mwl8k_bss_info_changed(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
static u64 mwl8k_prepare_multicast(struct ieee80211_hw *hw,
struct netdev_hw_addr_list *mc_list)
{
struct mwl8k_cmd_pkt *cmd;
struct mwl8k_cmd_pkt_hdr *cmd;

/*
* Synthesize and return a command packet that programs the
Expand Down Expand Up @@ -5234,7 +5236,7 @@ static void mwl8k_configure_filter(struct ieee80211_hw *hw,
u64 multicast)
{
struct mwl8k_priv *priv = hw->priv;
struct mwl8k_cmd_pkt *cmd = (void *)(unsigned long)multicast;
struct mwl8k_cmd_pkt_hdr *cmd = (void *)(unsigned long)multicast;

/*
* AP firmware doesn't allow fine-grained control over
Expand Down

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