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    Subject[PATCH] ipw2200 stack reduction
    Hi,

    Checking the stack usage of my kernel, showed that ipw2200 had a few bad
    offenders. This is on i386 32-bit:

    0x00002876 ipw_send_associate: 544
    0x000028ee ipw_send_associate: 544
    0x000027dc ipw_send_scan_request_ext: 520
    0x00002864 ipw_set_sensitivity: 520
    0x00005eac ipw_set_rsn_capa: 520

    The reason is the host_cmd structure is large (500 bytes). All other
    functions currently using ipw_send_cmd() suffer from the same problem.
    This patch introduces ipw_send_cmd_simple() for commands with no data
    transfer, and ipw_send_cmd_pdu() for commands with a data payload.

    As an added bonus, the diffstat looks like this:

    ipw2200.c | 285 +++++++++++++++++++++++++-------------------------------------
    1 files changed, 115 insertions(+), 170 deletions(-)

    and it shrinks the module a lot as well:

    Before:

    text data bss dec hex filename
    75177 2472 44 77693 12f7d drivers/net/wireless/ipw2200.ko

    After:

    text data bss dec hex filename
    65731 2472 44 68247 10a97 drivers/net/wireless/ipw2200.ko

    (lsmod size is shrunk ~9kb, or about 11%).

    Signed-off-by: Jens Axboe <axboe@suse.de>

    diff --git a/drivers/net/wireless/ipw2200.c b/drivers/net/wireless/ipw2200.c
    index 5e7c7e9..9ce659b 100644
    --- a/drivers/net/wireless/ipw2200.c
    +++ b/drivers/net/wireless/ipw2200.c
    @@ -1870,7 +1870,7 @@ static char *get_cmd_string(u8 cmd)
    }

    #define HOST_COMPLETE_TIMEOUT HZ
    -static int ipw_send_cmd(struct ipw_priv *priv, struct host_cmd *cmd)
    +static int __ipw_send_cmd(struct ipw_priv *priv, struct host_cmd *cmd, int put)
    {
    int rc = 0;
    unsigned long flags;
    @@ -1880,6 +1880,8 @@ static int ipw_send_cmd(struct ipw_priv
    IPW_ERROR("Failed to send %s: Already sending a command.\n",
    get_cmd_string(cmd->cmd));
    spin_unlock_irqrestore(&priv->lock, flags);
    + if (put)
    + kfree(cmd);
    return -EAGAIN;
    }

    @@ -1934,69 +1936,92 @@ static int ipw_send_cmd(struct ipw_priv
    goto exit;
    }

    - exit:
    +exit:
    if (priv->cmdlog) {
    priv->cmdlog[priv->cmdlog_pos++].retcode = rc;
    priv->cmdlog_pos %= priv->cmdlog_len;
    }
    + if (put)
    + kfree(cmd);
    return rc;
    }

    -static int ipw_send_host_complete(struct ipw_priv *priv)
    +static struct host_cmd *ipw_host_cmd_get(u8 command, u8 len)
    {
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_HOST_COMPLETE,
    - .len = 0
    - };
    + struct host_cmd *cmd;
    +
    + cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
    + if (cmd) {
    + cmd->cmd = command;
    + cmd->len = len;
    + return cmd;
    + }
    +
    + return NULL;
    +}
    +
    +static int ipw_send_cmd_simple(struct ipw_priv *priv, u8 command)
    +{
    + struct host_cmd *cmd;
    +
    + cmd = ipw_host_cmd_get(command, 0);
    + if (cmd)
    + return __ipw_send_cmd(priv, cmd, 1);

    + IPW_ERROR("Out of memory for cmd %x\n", command);
    + return -1;
    +}
    +
    +static int ipw_send_cmd_pdu(struct ipw_priv *priv, u8 command, u8 len,
    + void *data)
    +{
    + struct host_cmd *cmd;
    +
    + cmd = ipw_host_cmd_get(command, len);
    + if (cmd) {
    + memcpy(cmd->param, data, len);
    + return __ipw_send_cmd(priv, cmd, 1);
    + }
    +
    + IPW_ERROR("Out of memory for cmd %x\n", command);
    + return -1;
    +}
    +
    +static int ipw_send_host_complete(struct ipw_priv *priv)
    +{
    if (!priv) {
    IPW_ERROR("Invalid args\n");
    return -1;
    }

    - return ipw_send_cmd(priv, &cmd);
    + return ipw_send_cmd_simple(priv, IPW_CMD_HOST_COMPLETE);
    }

    static int ipw_send_system_config(struct ipw_priv *priv,
    struct ipw_sys_config *config)
    {
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_SYSTEM_CONFIG,
    - .len = sizeof(*config)
    - };
    -
    if (!priv || !config) {
    IPW_ERROR("Invalid args\n");
    return -1;
    }

    - memcpy(cmd.param, config, sizeof(*config));
    - return ipw_send_cmd(priv, &cmd);
    + return ipw_send_cmd_pdu(priv, IPW_CMD_SYSTEM_CONFIG, sizeof(*config),
    + config);
    }

    static int ipw_send_ssid(struct ipw_priv *priv, u8 * ssid, int len)
    {
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_SSID,
    - .len = min(len, IW_ESSID_MAX_SIZE)
    - };
    -
    if (!priv || !ssid) {
    IPW_ERROR("Invalid args\n");
    return -1;
    }

    - memcpy(cmd.param, ssid, cmd.len);
    - return ipw_send_cmd(priv, &cmd);
    + return ipw_send_cmd_pdu(priv, IPW_CMD_SSID, min(len, IW_ESSID_MAX_SIZE),
    + ssid);
    }

    static int ipw_send_adapter_address(struct ipw_priv *priv, u8 * mac)
    {
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_ADAPTER_ADDRESS,
    - .len = ETH_ALEN
    - };
    -
    if (!priv || !mac) {
    IPW_ERROR("Invalid args\n");
    return -1;
    @@ -2005,8 +2030,8 @@ static int ipw_send_adapter_address(stru
    IPW_DEBUG_INFO("%s: Setting MAC to " MAC_FMT "\n",
    priv->net_dev->name, MAC_ARG(mac));

    - memcpy(cmd.param, mac, ETH_ALEN);
    - return ipw_send_cmd(priv, &cmd);
    + return ipw_send_cmd_pdu(priv, IPW_CMD_ADAPTER_ADDRESS, ETH_ALEN,
    + mac);
    }

    /*
    @@ -2065,51 +2090,40 @@ static void ipw_bg_scan_check(void *data
    static int ipw_send_scan_request_ext(struct ipw_priv *priv,
    struct ipw_scan_request_ext *request)
    {
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_SCAN_REQUEST_EXT,
    - .len = sizeof(*request)
    - };
    -
    - memcpy(cmd.param, request, sizeof(*request));
    - return ipw_send_cmd(priv, &cmd);
    + return ipw_send_cmd_pdu(priv, IPW_CMD_SCAN_REQUEST_EXT,
    + sizeof(*request), request);
    }

    static int ipw_send_scan_abort(struct ipw_priv *priv)
    {
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_SCAN_ABORT,
    - .len = 0
    - };
    -
    if (!priv) {
    IPW_ERROR("Invalid args\n");
    return -1;
    }

    - return ipw_send_cmd(priv, &cmd);
    + return ipw_send_cmd_simple(priv, IPW_CMD_SCAN_ABORT);
    }

    static int ipw_set_sensitivity(struct ipw_priv *priv, u16 sens)
    {
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_SENSITIVITY_CALIB,
    - .len = sizeof(struct ipw_sensitivity_calib)
    + struct ipw_sensitivity_calib calib = {
    + .beacon_rssi_raw = sens,
    };
    - struct ipw_sensitivity_calib *calib = (struct ipw_sensitivity_calib *)
    - &cmd.param;
    - calib->beacon_rssi_raw = sens;
    - return ipw_send_cmd(priv, &cmd);
    +
    + return ipw_send_cmd_pdu(priv, IPW_CMD_SENSITIVITY_CALIB, sizeof(calib),
    + &calib);
    }

    static int ipw_send_associate(struct ipw_priv *priv,
    struct ipw_associate *associate)
    {
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_ASSOCIATE,
    - .len = sizeof(*associate)
    - };
    -
    struct ipw_associate tmp_associate;
    +
    + if (!priv || !associate) {
    + IPW_ERROR("Invalid args\n");
    + return -1;
    + }
    +
    memcpy(&tmp_associate, associate, sizeof(*associate));
    tmp_associate.policy_support =
    cpu_to_le16(tmp_associate.policy_support);
    @@ -2122,80 +2136,56 @@ static int ipw_send_associate(struct ipw
    cpu_to_le16(tmp_associate.beacon_interval);
    tmp_associate.atim_window = cpu_to_le16(tmp_associate.atim_window);

    - if (!priv || !associate) {
    - IPW_ERROR("Invalid args\n");
    - return -1;
    - }
    -
    - memcpy(cmd.param, &tmp_associate, sizeof(*associate));
    - return ipw_send_cmd(priv, &cmd);
    + return ipw_send_cmd_pdu(priv, IPW_CMD_ASSOCIATE, sizeof(tmp_associate),
    + &tmp_associate);
    }

    static int ipw_send_supported_rates(struct ipw_priv *priv,
    struct ipw_supported_rates *rates)
    {
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_SUPPORTED_RATES,
    - .len = sizeof(*rates)
    - };
    -
    if (!priv || !rates) {
    IPW_ERROR("Invalid args\n");
    return -1;
    }

    - memcpy(cmd.param, rates, sizeof(*rates));
    - return ipw_send_cmd(priv, &cmd);
    + return ipw_send_cmd_pdu(priv, IPW_CMD_SUPPORTED_RATES, sizeof(*rates),
    + rates);
    }

    static int ipw_set_random_seed(struct ipw_priv *priv)
    {
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_SEED_NUMBER,
    - .len = sizeof(u32)
    - };
    + u32 val;

    if (!priv) {
    IPW_ERROR("Invalid args\n");
    return -1;
    }

    - get_random_bytes(&cmd.param, sizeof(u32));
    + get_random_bytes(&val, sizeof(val));

    - return ipw_send_cmd(priv, &cmd);
    + return ipw_send_cmd_pdu(priv, IPW_CMD_SEED_NUMBER, sizeof(val), &val);
    }

    static int ipw_send_card_disable(struct ipw_priv *priv, u32 phy_off)
    {
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_CARD_DISABLE,
    - .len = sizeof(u32)
    - };
    -
    if (!priv) {
    IPW_ERROR("Invalid args\n");
    return -1;
    }

    - *((u32 *) & cmd.param) = phy_off;
    -
    - return ipw_send_cmd(priv, &cmd);
    + return ipw_send_cmd_pdu(priv, IPW_CMD_CARD_DISABLE, sizeof(phy_off),
    + &phy_off);
    }

    static int ipw_send_tx_power(struct ipw_priv *priv, struct ipw_tx_power *power)
    {
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_TX_POWER,
    - .len = sizeof(*power)
    - };
    -
    if (!priv || !power) {
    IPW_ERROR("Invalid args\n");
    return -1;
    }

    - memcpy(cmd.param, power, sizeof(*power));
    - return ipw_send_cmd(priv, &cmd);
    + return ipw_send_cmd_pdu(priv, IPW_CMD_TX_POWER, sizeof(*power),
    + power);
    }

    static int ipw_set_tx_power(struct ipw_priv *priv)
    @@ -2247,18 +2237,14 @@ static int ipw_send_rts_threshold(struct
    struct ipw_rts_threshold rts_threshold = {
    .rts_threshold = rts,
    };
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_RTS_THRESHOLD,
    - .len = sizeof(rts_threshold)
    - };

    if (!priv) {
    IPW_ERROR("Invalid args\n");
    return -1;
    }

    - memcpy(cmd.param, &rts_threshold, sizeof(rts_threshold));
    - return ipw_send_cmd(priv, &cmd);
    + return ipw_send_cmd_pdu(priv, IPW_CMD_RTS_THRESHOLD,
    + sizeof(rts_threshold), &rts_threshold);
    }

    static int ipw_send_frag_threshold(struct ipw_priv *priv, u16 frag)
    @@ -2266,27 +2252,19 @@ static int ipw_send_frag_threshold(struc
    struct ipw_frag_threshold frag_threshold = {
    .frag_threshold = frag,
    };
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_FRAG_THRESHOLD,
    - .len = sizeof(frag_threshold)
    - };

    if (!priv) {
    IPW_ERROR("Invalid args\n");
    return -1;
    }

    - memcpy(cmd.param, &frag_threshold, sizeof(frag_threshold));
    - return ipw_send_cmd(priv, &cmd);
    + return ipw_send_cmd_pdu(priv, IPW_CMD_FRAG_THRESHOLD,
    + sizeof(frag_threshold), &frag_threshold);
    }

    static int ipw_send_power_mode(struct ipw_priv *priv, u32 mode)
    {
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_POWER_MODE,
    - .len = sizeof(u32)
    - };
    - u32 *param = (u32 *) (&cmd.param);
    + u32 param;

    if (!priv) {
    IPW_ERROR("Invalid args\n");
    @@ -2297,17 +2275,18 @@ static int ipw_send_power_mode(struct ip
    * level */
    switch (mode) {
    case IPW_POWER_BATTERY:
    - *param = IPW_POWER_INDEX_3;
    + param = IPW_POWER_INDEX_3;
    break;
    case IPW_POWER_AC:
    - *param = IPW_POWER_MODE_CAM;
    + param = IPW_POWER_MODE_CAM;
    break;
    default:
    - *param = mode;
    + param = mode;
    break;
    }

    - return ipw_send_cmd(priv, &cmd);
    + return ipw_send_cmd_pdu(priv, IPW_CMD_POWER_MODE, sizeof(param),
    + &param);
    }

    static int ipw_send_retry_limit(struct ipw_priv *priv, u8 slimit, u8 llimit)
    @@ -2316,18 +2295,14 @@ static int ipw_send_retry_limit(struct i
    .short_retry_limit = slimit,
    .long_retry_limit = llimit
    };
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_RETRY_LIMIT,
    - .len = sizeof(retry_limit)
    - };

    if (!priv) {
    IPW_ERROR("Invalid args\n");
    return -1;
    }

    - memcpy(cmd.param, &retry_limit, sizeof(retry_limit));
    - return ipw_send_cmd(priv, &cmd);
    + return ipw_send_cmd_pdu(priv, IPW_CMD_RETRY_LIMIT, sizeof(retry_limit),
    + &retry_limit);
    }

    /*
    @@ -5672,54 +5647,44 @@ static void ipw_adhoc_create(struct ipw_

    static void ipw_send_tgi_tx_key(struct ipw_priv *priv, int type, int index)
    {
    - struct ipw_tgi_tx_key *key;
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_TGI_TX_KEY,
    - .len = sizeof(*key)
    - };
    + struct ipw_tgi_tx_key key;

    if (!(priv->ieee->sec.flags & (1 << index)))
    return;

    - key = (struct ipw_tgi_tx_key *)&cmd.param;
    - key->key_id = index;
    - memcpy(key->key, priv->ieee->sec.keys[index], SCM_TEMPORAL_KEY_LENGTH);
    - key->security_type = type;
    - key->station_index = 0; /* always 0 for BSS */
    - key->flags = 0;
    + key.key_id = index;
    + memcpy(key.key, priv->ieee->sec.keys[index], SCM_TEMPORAL_KEY_LENGTH);
    + key.security_type = type;
    + key.station_index = 0; /* always 0 for BSS */
    + key.flags = 0;
    /* 0 for new key; previous value of counter (after fatal error) */
    - key->tx_counter[0] = 0;
    - key->tx_counter[1] = 0;
    + key.tx_counter[0] = 0;
    + key.tx_counter[1] = 0;

    - ipw_send_cmd(priv, &cmd);
    + ipw_send_cmd_pdu(priv, IPW_CMD_TGI_TX_KEY, sizeof(key), &key);
    }

    static void ipw_send_wep_keys(struct ipw_priv *priv, int type)
    {
    - struct ipw_wep_key *key;
    + struct ipw_wep_key key;
    int i;
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_WEP_KEY,
    - .len = sizeof(*key)
    - };

    - key = (struct ipw_wep_key *)&cmd.param;
    - key->cmd_id = DINO_CMD_WEP_KEY;
    - key->seq_num = 0;
    + key.cmd_id = DINO_CMD_WEP_KEY;
    + key.seq_num = 0;

    /* Note: AES keys cannot be set for multiple times.
    * Only set it at the first time. */
    for (i = 0; i < 4; i++) {
    - key->key_index = i | type;
    + key.key_index = i | type;
    if (!(priv->ieee->sec.flags & (1 << i))) {
    - key->key_size = 0;
    + key.key_size = 0;
    continue;
    }

    - key->key_size = priv->ieee->sec.key_sizes[i];
    - memcpy(key->key, priv->ieee->sec.keys[i], key->key_size);
    + key.key_size = priv->ieee->sec.key_sizes[i];
    + memcpy(key.key, priv->ieee->sec.keys[i], key.key_size);

    - ipw_send_cmd(priv, &cmd);
    + ipw_send_cmd_pdu(priv, IPW_CMD_WEP_KEY, sizeof(key), &key);
    }
    }

    @@ -6216,15 +6181,10 @@ void ipw_wpa_assoc_frame(struct ipw_priv
    static int ipw_set_rsn_capa(struct ipw_priv *priv,
    char *capabilities, int length)
    {
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_RSN_CAPABILITIES,
    - .len = length,
    - };
    -
    IPW_DEBUG_HC("HOST_CMD_RSN_CAPABILITIES\n");

    - memcpy(cmd.param, capabilities, length);
    - return ipw_send_cmd(priv, &cmd);
    + return ipw_send_cmd_pdu(priv, IPW_CMD_RSN_CAPABILITIES, length,
    + capabilities);
    }

    /*
    @@ -7011,25 +6971,15 @@ static int ipw_handle_assoc_response(str
    static int ipw_send_qos_params_command(struct ipw_priv *priv, struct ieee80211_qos_parameters
    *qos_param)
    {
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_QOS_PARAMETERS,
    - .len = (sizeof(struct ieee80211_qos_parameters) * 3)
    - };
    -
    - memcpy(cmd.param, qos_param, sizeof(*qos_param) * 3);
    - return ipw_send_cmd(priv, &cmd);
    + return ipw_send_cmd_pdu(priv, IPW_CMD_QOS_PARAMETERS, qos_param,
    + sizeof(*qos_param) * 3);
    }

    static int ipw_send_qos_info_command(struct ipw_priv *priv, struct ieee80211_qos_information_element
    *qos_param)
    {
    - struct host_cmd cmd = {
    - .cmd = IPW_CMD_WME_INFO,
    - .len = sizeof(*qos_param)
    - };
    -
    - memcpy(cmd.param, qos_param, sizeof(*qos_param));
    - return ipw_send_cmd(priv, &cmd);
    + return ipw_send_cmd_pdu(priv, IPW_CMD_WME_INFO, qos_param,
    + sizeof(*qos_param));
    }

    #endif /* CONFIG_IPW_QOS */
    --
    Jens Axboe

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