Re: [PATCH] net: wwan: t7xx: fix tx buffer release loop on invalid skb
From: kernel test robot
Date: Fri Oct 16 2026 - 13:07:19 EST
Hi Liu,
kernel test robot noticed the following build warnings:
[auto build test WARNING on net-next/main]
[also build test WARNING on net/main wireless-next/main wireless/main linus/master v7.3-rc7 next-20261016]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Liu-Chao/net-wwan-t7xx-fix-tx-buffer-release-loop-on-invalid-skb/20261016-121156
base: net-next/main
patch link: https://lore.kernel.org/r/20261016041156.2295670-1-liuc63%40xiaopeng.com
patch subject: [PATCH] net: wwan: t7xx: fix tx buffer release loop on invalid skb
config: x86_64-rhel-9.4 (https://download.01.org/0day-ci/archive/20261017/202610170128.gs8DZ6Gj-lkp@xxxxxxxxx/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261017/202610170128.gs8DZ6Gj-lkp@xxxxxxxxx/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610170128.gs8DZ6Gj-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c: In function 't7xx_dpmaif_release_tx_buffer':
>> drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c:102:25: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
102 | if (!cur_drb_skb->is_msg)
| ^~
drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c:106:33: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
106 | if (!FIELD_GET(DRB_HDR_CONT, le32_to_cpu(cur_drb->header))) {
| ^~
vim +/if +102 drivers/net/wwan/t7xx/t7xx_hif_dpmaif_tx.c
d642b012df70a76 Haijun Liu 2022-05-06 79
d642b012df70a76 Haijun Liu 2022-05-06 80 static unsigned int t7xx_dpmaif_release_tx_buffer(struct dpmaif_ctrl *dpmaif_ctrl,
d642b012df70a76 Haijun Liu 2022-05-06 81 unsigned int q_num, unsigned int release_cnt)
d642b012df70a76 Haijun Liu 2022-05-06 82 {
d642b012df70a76 Haijun Liu 2022-05-06 83 struct dpmaif_tx_queue *txq = &dpmaif_ctrl->txq[q_num];
d642b012df70a76 Haijun Liu 2022-05-06 84 struct dpmaif_callbacks *cb = dpmaif_ctrl->callbacks;
d642b012df70a76 Haijun Liu 2022-05-06 85 struct dpmaif_drb_skb *cur_drb_skb, *drb_skb_base;
d642b012df70a76 Haijun Liu 2022-05-06 86 struct dpmaif_drb *cur_drb, *drb_base;
d642b012df70a76 Haijun Liu 2022-05-06 87 unsigned int drb_cnt, i, cur_idx;
d642b012df70a76 Haijun Liu 2022-05-06 88 unsigned long flags;
d642b012df70a76 Haijun Liu 2022-05-06 89
d642b012df70a76 Haijun Liu 2022-05-06 90 drb_skb_base = txq->drb_skb_base;
d642b012df70a76 Haijun Liu 2022-05-06 91 drb_base = txq->drb_base;
d642b012df70a76 Haijun Liu 2022-05-06 92
d642b012df70a76 Haijun Liu 2022-05-06 93 spin_lock_irqsave(&txq->tx_lock, flags);
d642b012df70a76 Haijun Liu 2022-05-06 94 drb_cnt = txq->drb_size_cnt;
d642b012df70a76 Haijun Liu 2022-05-06 95 cur_idx = txq->drb_release_rd_idx;
d642b012df70a76 Haijun Liu 2022-05-06 96 spin_unlock_irqrestore(&txq->tx_lock, flags);
d642b012df70a76 Haijun Liu 2022-05-06 97
d642b012df70a76 Haijun Liu 2022-05-06 98 for (i = 0; i < release_cnt; i++) {
d642b012df70a76 Haijun Liu 2022-05-06 99 cur_drb = drb_base + cur_idx;
d642b012df70a76 Haijun Liu 2022-05-06 100 if (FIELD_GET(DRB_HDR_DTYP, le32_to_cpu(cur_drb->header)) == DES_DTYP_PD) {
d642b012df70a76 Haijun Liu 2022-05-06 101 cur_drb_skb = drb_skb_base + cur_idx;
d642b012df70a76 Haijun Liu 2022-05-06 @102 if (!cur_drb_skb->is_msg)
d642b012df70a76 Haijun Liu 2022-05-06 103 dma_unmap_single(dpmaif_ctrl->dev, cur_drb_skb->bus_addr,
d642b012df70a76 Haijun Liu 2022-05-06 104 cur_drb_skb->data_len, DMA_TO_DEVICE);
d642b012df70a76 Haijun Liu 2022-05-06 105
d642b012df70a76 Haijun Liu 2022-05-06 106 if (!FIELD_GET(DRB_HDR_CONT, le32_to_cpu(cur_drb->header))) {
d642b012df70a76 Haijun Liu 2022-05-06 107 if (!cur_drb_skb->skb) {
d642b012df70a76 Haijun Liu 2022-05-06 108 dev_err(dpmaif_ctrl->dev,
d642b012df70a76 Haijun Liu 2022-05-06 109 "txq%u: DRB check fail, invalid skb\n", q_num);
35baede15130184 Liu Chao 2026-10-16 110 } else {
d642b012df70a76 Haijun Liu 2022-05-06 111 dev_kfree_skb_any(cur_drb_skb->skb);
d642b012df70a76 Haijun Liu 2022-05-06 112 }
35baede15130184 Liu Chao 2026-10-16 113 }
d642b012df70a76 Haijun Liu 2022-05-06 114
d642b012df70a76 Haijun Liu 2022-05-06 115 cur_drb_skb->skb = NULL;
d642b012df70a76 Haijun Liu 2022-05-06 116 }
d642b012df70a76 Haijun Liu 2022-05-06 117
d642b012df70a76 Haijun Liu 2022-05-06 118 spin_lock_irqsave(&txq->tx_lock, flags);
d642b012df70a76 Haijun Liu 2022-05-06 119 cur_idx = t7xx_ring_buf_get_next_wr_idx(drb_cnt, cur_idx);
d642b012df70a76 Haijun Liu 2022-05-06 120 txq->drb_release_rd_idx = cur_idx;
d642b012df70a76 Haijun Liu 2022-05-06 121 spin_unlock_irqrestore(&txq->tx_lock, flags);
d642b012df70a76 Haijun Liu 2022-05-06 122
d642b012df70a76 Haijun Liu 2022-05-06 123 if (atomic_inc_return(&txq->tx_budget) > txq->drb_size_cnt / 8)
d642b012df70a76 Haijun Liu 2022-05-06 124 cb->state_notify(dpmaif_ctrl->t7xx_dev, DMPAIF_TXQ_STATE_IRQ, txq->index);
d642b012df70a76 Haijun Liu 2022-05-06 125 }
d642b012df70a76 Haijun Liu 2022-05-06 126
d642b012df70a76 Haijun Liu 2022-05-06 127 if (FIELD_GET(DRB_HDR_CONT, le32_to_cpu(cur_drb->header)))
d642b012df70a76 Haijun Liu 2022-05-06 128 dev_err(dpmaif_ctrl->dev, "txq%u: DRB not marked as the last one\n", q_num);
d642b012df70a76 Haijun Liu 2022-05-06 129
d642b012df70a76 Haijun Liu 2022-05-06 130 return i;
d642b012df70a76 Haijun Liu 2022-05-06 131 }
d642b012df70a76 Haijun Liu 2022-05-06 132
--
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https://github.com/intel/lkp-tests/wiki