BCC: lkp(a)intel.com
CC: kbuild-all(a)lists.01.org
CC: linux-kernel(a)vger.kernel.org
TO: Lorenzo Bianconi <lorenzo@kernel.org>
CC: Felix Fietkau <nbd@nbd.name>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   568035b01cfb107af8d2e4bd2fb9aea22cf5b868
commit: 3782b69d03e714b8ff98b84c7426d8cef0e64d7c mt76: mt7915: introduce mt7915_mac_add_twt_setup routine
date:   10 months ago
:::::: branch date: 3 hours ago
:::::: commit date: 10 months ago
config: ia64-randconfig-m031-20220814 (https://download.01.org/0day-ci/archive/20220815/202208150940.Mkzr1sPZ-lkp(a)intel.com/config)
compiler: ia64-linux-gcc (GCC) 12.1.0

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

New smatch warnings:
drivers/net/wireless/mediatek/mt76/mt7915/mac.c:2285 mt7915_mac_twt_sched_list_add() error: uninitialized symbol 'start_tsf'.

Old smatch warnings:
drivers/net/wireless/mediatek/mt76/mt7915/mac.c:1312 mt7915_mac_tx_free() warn: potential spectre issue 'dev->mt76.wcid' [w]

vim +/start_tsf +2285 drivers/net/wireless/mediatek/mt76/mt7915/mac.c

3782b69d03e714 Lorenzo Bianconi 2021-09-23  2252  
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2253  static u64
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2254  mt7915_mac_twt_sched_list_add(struct mt7915_dev *dev,
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2255  			      struct mt7915_twt_flow *flow)
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2256  {
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2257  	struct mt7915_twt_flow *iter, *iter_next;
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2258  	u32 duration = flow->duration << 8;
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2259  	u64 start_tsf;
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2260  
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2261  	iter = list_first_entry_or_null(&dev->twt_list,
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2262  					struct mt7915_twt_flow, list);
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2263  	if (!iter || !iter->sched || iter->start_tsf > duration) {
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2264  		/* add flow as first entry in the list */
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2265  		list_add(&flow->list, &dev->twt_list);
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2266  		return 0;
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2267  	}
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2268  
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2269  	list_for_each_entry_safe(iter, iter_next, &dev->twt_list, list) {
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2270  		start_tsf = iter->start_tsf +
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2271  			    mt7915_mac_twt_duration_align(iter->duration);
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2272  		if (list_is_last(&iter->list, &dev->twt_list))
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2273  			break;
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2274  
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2275  		if (!iter_next->sched ||
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2276  		    iter_next->start_tsf > start_tsf + duration) {
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2277  			list_add(&flow->list, &iter->list);
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2278  			goto out;
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2279  		}
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2280  	}
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2281  
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2282  	/* add flow as last entry in the list */
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2283  	list_add_tail(&flow->list, &dev->twt_list);
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2284  out:
3782b69d03e714 Lorenzo Bianconi 2021-09-23 @2285  	return start_tsf;
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2286  }
3782b69d03e714 Lorenzo Bianconi 2021-09-23  2287  

-- 
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