[PATCH 3/3] ath10k: average ack rssi support for data frames

[kbuild test robot]

Hi Balaji,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on next-20180411]
[cannot apply to ath6kl/ath-next v4.16 v4.16-rc7 v4.16-rc6 v4.16]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Balaji-Pothunoori/cfg80211-average-ack-rssi-support-for-data-frames/20180414-115825
config: xtensa-allyesconfig (attached as .config)
compiler: xtensa-linux-gcc (GCC) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=xtensa 

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   drivers/net/wireless/ath/ath10k/htt_rx.c: In function 'ath10k_htt_t2h_msg_handler':
>> drivers/net/wireless/ath/ath10k/htt_rx.c:1886:9: warning: 'msdu_count' may be used uninitialized in this function [-Wmaybe-uninitialized]
     __le16 msdu_count;
            ^~~~~~~~~~

vim +/msdu_count +1886 drivers/net/wireless/ath/ath10k/htt_rx.c

  1875	
  1876	static void ath10k_htt_rx_tx_compl_ind(struct ath10k *ar,
  1877					       struct sk_buff *skb)
  1878	{
  1879		struct ath10k_htt *htt = &ar->htt;
  1880		struct htt_resp *resp = (struct htt_resp *)skb->data;
  1881		struct htt_tx_done tx_done = {};
  1882		int status = MS(resp->data_tx_completion.flags, HTT_DATA_TX_STATUS);
  1883		__le16 msdu_id;
  1884		int i;
  1885		bool rssi_enabled;
> 1886		__le16 msdu_count;
  1887	
  1888		switch (status) {
  1889		case HTT_DATA_TX_STATUS_NO_ACK:
  1890			tx_done.status = HTT_TX_COMPL_STATE_NOACK;
  1891			break;
  1892		case HTT_DATA_TX_STATUS_OK:
  1893			tx_done.status = HTT_TX_COMPL_STATE_ACK;
  1894			break;
  1895		case HTT_DATA_TX_STATUS_DISCARD:
  1896		case HTT_DATA_TX_STATUS_POSTPONE:
  1897		case HTT_DATA_TX_STATUS_DOWNLOAD_FAIL:
  1898			tx_done.status = HTT_TX_COMPL_STATE_DISCARD;
  1899			break;
  1900		default:
  1901			ath10k_warn(ar, "unhandled tx completion status %d\n", status);
  1902			tx_done.status = HTT_TX_COMPL_STATE_DISCARD;
  1903			break;
  1904		}
  1905	
  1906		ath10k_dbg(ar, ATH10K_DBG_HTT, "htt tx completion num_msdus %d\n",
  1907			   resp->data_tx_completion.num_msdus);
  1908	
  1909		if (resp->data_tx_completion.flags2 & HTT_TX_CMPL_FLAG_DATA_RSSI) {
  1910			rssi_enabled = true;
  1911			msdu_count = __le16_to_cpu(resp->data_tx_completion.num_msdus);
  1912		} else {
  1913			rssi_enabled = false;
  1914		}
  1915	
  1916		for (i = 0; i < resp->data_tx_completion.num_msdus; i++) {
  1917			msdu_id = resp->data_tx_completion.msdus[i];
  1918			tx_done.msdu_id = __le16_to_cpu(msdu_id);
  1919	
  1920			if (rssi_enabled) {
  1921				/* Total no of MSDUs should be even,
  1922				 * if odd MSDUs are sent firmware fills
  1923				 * last msdu id with 0xffff
  1924				 */
  1925				if (msdu_count & 0x01)
  1926					tx_done.ack_rssi =
  1927					resp->data_tx_completion.msdus[msdu_count +  i + 1];
  1928				else
  1929					tx_done.ack_rssi =
  1930					resp->data_tx_completion.msdus[msdu_count + i];
  1931			}
  1932			/* kfifo_put: In practice firmware shouldn't fire off per-CE
  1933			 * interrupt and main interrupt (MSI/-X range case) for the same
  1934			 * HTC service so it should be safe to use kfifo_put w/o lock.
  1935			 *
  1936			 * From kfifo_put() documentation:
  1937			 *  Note that with only one concurrent reader and one concurrent
  1938			 *  writer, you don't need extra locking to use these macro.
  1939			 */
  1940			if (!kfifo_put(&htt->txdone_fifo, tx_done)) {
  1941				ath10k_warn(ar, "txdone fifo overrun, msdu_id %d status %d\n",
  1942					    tx_done.msdu_id, tx_done.status);
  1943				ath10k_txrx_tx_unref(htt, &tx_done);
  1944			}
  1945		}
  1946	}
  1947	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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