[PATCH][next] wifi: iwlwifi: mvm: Avoid -Wflex-array-member-not-at-end warning

From: Gustavo A. R. Silva
Date: Wed Mar 26 2025 - 20:04:13 EST


-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.

Use the `DEFINE_RAW_FLEX()` helper for an on-stack definition of
a flexible structure where the size of the flexible-array member
is known at compile-time, and refactor the rest of the code,
accordingly.

So, with these changes, fix the following warning:

drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c:6430:41: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
---
.../net/wireless/intel/iwlwifi/mvm/mac80211.c | 25 +++++++++----------
1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 1e916a0ce082..5d8f50a455d7 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -6426,17 +6426,10 @@ void iwl_mvm_sync_rx_queues_internal(struct iwl_mvm *mvm,
bool sync,
const void *data, u32 size)
{
- struct {
- struct iwl_rxq_sync_cmd cmd;
- struct iwl_mvm_internal_rxq_notif notif;
- } __packed cmd = {
- .cmd.rxq_mask = cpu_to_le32(BIT(mvm->trans->num_rx_queues) - 1),
- .cmd.count =
- cpu_to_le32(sizeof(struct iwl_mvm_internal_rxq_notif) +
- size),
- .notif.type = type,
- .notif.sync = sync,
- };
+ DEFINE_RAW_FLEX(struct iwl_rxq_sync_cmd, cmd, payload,
+ sizeof(struct iwl_mvm_internal_rxq_notif));
+ struct iwl_mvm_internal_rxq_notif *notif =
+ (struct iwl_mvm_internal_rxq_notif *)cmd->payload;
struct iwl_host_cmd hcmd = {
.id = WIDE_ID(DATA_PATH_GROUP, TRIGGER_RX_QUEUES_NOTIF_CMD),
.data[0] = &cmd,
@@ -6447,15 +6440,21 @@ void iwl_mvm_sync_rx_queues_internal(struct iwl_mvm *mvm,
};
int ret;

+ cmd->rxq_mask = cpu_to_le32(BIT(mvm->trans->num_rx_queues) - 1);
+ cmd->count = cpu_to_le32(sizeof(struct iwl_mvm_internal_rxq_notif) +
+ size);
+ notif->type = type;
+ notif->sync = sync;
+
/* size must be a multiple of DWORD */
- if (WARN_ON(cmd.cmd.count & cpu_to_le32(3)))
+ if (WARN_ON(cmd->count & cpu_to_le32(3)))
return;

if (!iwl_mvm_has_new_rx_api(mvm))
return;

if (sync) {
- cmd.notif.cookie = mvm->queue_sync_cookie;
+ notif->cookie = mvm->queue_sync_cookie;
mvm->queue_sync_state = (1 << mvm->trans->num_rx_queues) - 1;
}

--
2.43.0