iwlwifi: mvm: use IWL_HCMD_NOCOPY for MCAST_FILTER_CMD

commit 97bce57bd7f96e1218751996f549a6e61f18cc8c upstream.

The MCAST_FILTER_CMD can get quite large when we have many mcast
addresses to set (we support up to 255).  So the command should be
send as NOCOPY to prevent a warning caused by too-long commands:

WARNING: CPU: 0 PID: 9700 at /root/iwlwifi/stack-dev/drivers/net/wireless/intel/iwlwifi/pcie/tx.c:1550 iwl_pcie_enqueue_hcmd+0x8c7/0xb40 [iwlwifi]
Command MCAST_FILTER_CMD (0x1d0) is too large (328 bytes)

This fixes: https://bugzilla.kernel.org/show_bug.cgi?id=196743

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/wireless/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/iwlwifi/mvm/mac80211.c
index 1a8ea775de08e3315a0d94eae7d842032b9f48a0..984cd2f05c4ad9ceba5168726ea62f079f2724db 100644 (file)
--- a/drivers/net/wireless/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/iwlwifi/mvm/mac80211.c
@@ -1906,6 +1906,11 @@ static void iwl_mvm_mc_iface_iterator(void *_data, u8 *mac,
        struct iwl_mvm_mc_iter_data *data = _data;
        struct iwl_mvm *mvm = data->mvm;
        struct iwl_mcast_filter_cmd *cmd = mvm->mcast_filter_cmd;
+       struct iwl_host_cmd hcmd = {
+               .id = MCAST_FILTER_CMD,
+               .flags = CMD_ASYNC,
+               .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
+       };
        int ret, len;
 
        /* if we don't have free ports, mcast frames will be dropped */
@@ -1920,7 +1925,10 @@ static void iwl_mvm_mc_iface_iterator(void *_data, u8 *mac,
        memcpy(cmd->bssid, vif->bss_conf.bssid, ETH_ALEN);
        len = roundup(sizeof(*cmd) + cmd->count * ETH_ALEN, 4);
 
-       ret = iwl_mvm_send_cmd_pdu(mvm, MCAST_FILTER_CMD, CMD_ASYNC, len, cmd);
+       hcmd.len[0] = len;
+       hcmd.data[0] = cmd;
+
+       ret = iwl_mvm_send_cmd(mvm, &hcmd);
        if (ret)
                IWL_ERR(mvm, "mcast filter cmd error. ret=%d\n", ret);
 }