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Wed, 10 Feb 2021 11:07:16 +0000 Received: from abhmp0013.oracle.com (abhmp0013.oracle.com [141.146.116.19]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 11AB7F56001345; Wed, 10 Feb 2021 11:07:15 GMT Received: from mwanda (/102.36.221.92) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 10 Feb 2021 03:07:15 -0800 Date: Wed, 10 Feb 2021 14:07:09 +0300 From: Dan Carpenter To: sean.wang@mediatek.com Cc: linux-wireless@vger.kernel.org Subject: [bug report] mt76: mt7921: add MCU support Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Proofpoint-IMR: 1 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9890 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 bulkscore=0 adultscore=0 mlxlogscore=999 phishscore=0 spamscore=0 suspectscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2102100109 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9890 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 mlxscore=0 mlxlogscore=999 spamscore=0 impostorscore=0 malwarescore=0 clxscore=1011 suspectscore=0 adultscore=0 bulkscore=0 lowpriorityscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2102100108 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Hello Sean Wang, The patch 1c099ab44727: "mt76: mt7921: add MCU support" from Jan 28, 2021, leads to the following static checker warning: drivers/net/wireless/mediatek/mt76/mt7921/mcu.c:409 mt7921_mcu_tx_rate_report() error: potentially dereferencing uninitialized 'stats'. drivers/net/wireless/mediatek/mt76/mt7921/mcu.c 390 static void 391 mt7921_mcu_tx_rate_report(struct mt7921_dev *dev, struct sk_buff *skb, 392 u16 wlan_idx) 393 { 394 struct mt7921_mcu_wlan_info_event *wtbl_info = 395 (struct mt7921_mcu_wlan_info_event *)(skb->data); 396 struct rate_info rate = {}; 397 u8 curr_idx = wtbl_info->rate_info.rate_idx; 398 u16 curr = le16_to_cpu(wtbl_info->rate_info.rate[curr_idx]); 399 struct mt7921_mcu_peer_cap peer = wtbl_info->peer_cap; 400 struct mt76_phy *mphy = &dev->mphy; 401 struct mt7921_sta_stats *stats; 402 struct mt7921_sta *msta; 403 struct mt76_wcid *wcid; 404 405 if (wlan_idx >= MT76_N_WCIDS) 406 return; 407 wcid = rcu_dereference(dev->mt76.wcid[wlan_idx]); 408 if (!wcid) { 409 stats->tx_rate = rate; ^^^^^^^^^^^^^^^^^^^^^ Not initialized 410 return; 411 } 412 413 msta = container_of(wcid, struct mt7921_sta, wcid); 414 stats = &msta->stats; ^^^^^^^^^^^^^^^^^^^^ 415 416 /* current rate */ 417 mt7921_mcu_tx_rate_parse(mphy, &peer, &rate, curr); 418 stats->tx_rate = rate; 419 } regards, dan carpenter