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Date: Fri, 5 Jun 2020 02:06:14 +0000 From: Andy Duan <fugang.duan@....com> To: "davem@...emloft.net" <davem@...emloft.net>, "peppe.cavallaro@...com" <peppe.cavallaro@...com>, "alexandre.torgue@...com" <alexandre.torgue@...com>, "joabreu@...opsys.com" <joabreu@...opsys.com> CC: "kuba@...nel.org" <kuba@...nel.org>, "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>, "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>, "linux-stm32@...md-mailman.stormreply.com" <linux-stm32@...md-mailman.stormreply.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: RE: [PATCH net,stable 1/1] net: ethernet: stmmac: free tx skb buffer in stmmac_resume() Ping... From: Andy Duan <fugang.duan@....com> Sent: Tuesday, June 2, 2020 3:58 PM > From: Fugang Duan <fugang.duan@....com> > > When do suspend/resume test, there have WARN_ON() log dump from > stmmac_xmit() funciton, the code logic: > entry = tx_q->cur_tx; > first_entry = entry; > WARN_ON(tx_q->tx_skbuff[first_entry]); > > In normal case, tx_q->tx_skbuff[txq->cur_tx] should be NULL because the skb > should be processed and freed in stmmac_tx_clean(). > > But stmmac_resume() reset queue parameters like below, skb buffers may not > be freed. > tx_q->cur_tx = 0; > tx_q->dirty_tx = 0; > > So free tx skb buffer in stmmac_resume() to avoid warning and memory leak. > > log: > [ 46.139824] ------------[ cut here ]------------ > [ 46.144453] WARNING: CPU: 0 PID: 0 at > drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:3235 > stmmac_xmit+0x7a0/0x9d0 > [ 46.154969] Modules linked in: crct10dif_ce vvcam(O) flexcan can_dev > [ 46.161328] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G O > 5.4.24-2.1.0+g2ad925d15481 #1 > [ 46.170369] Hardware name: NXP i.MX8MPlus EVK board (DT) > [ 46.175677] pstate: 80000005 (Nzcv daif -PAN -UAO) > [ 46.180465] pc : stmmac_xmit+0x7a0/0x9d0 > [ 46.184387] lr : dev_hard_start_xmit+0x94/0x158 > [ 46.188913] sp : ffff800010003cc0 > [ 46.192224] x29: ffff800010003cc0 x28: ffff000177e2a100 > [ 46.197533] x27: ffff000176ef0840 x26: ffff000176ef0090 > [ 46.202842] x25: 0000000000000000 x24: 0000000000000000 > [ 46.208151] x23: 0000000000000003 x22: ffff8000119ddd30 > [ 46.213460] x21: ffff00017636f000 x20: ffff000176ef0cc0 > [ 46.218769] x19: 0000000000000003 x18: 0000000000000000 > [ 46.224078] x17: 0000000000000000 x16: 0000000000000000 > [ 46.229386] x15: 0000000000000079 x14: 0000000000000000 > [ 46.234695] x13: 0000000000000003 x12: 0000000000000003 > [ 46.240003] x11: 0000000000000010 x10: 0000000000000010 > [ 46.245312] x9 : ffff00017002b140 x8 : 0000000000000000 > [ 46.250621] x7 : ffff00017636f000 x6 : 0000000000000010 > [ 46.255930] x5 : 0000000000000001 x4 : ffff000176ef0000 > [ 46.261238] x3 : 0000000000000003 x2 : 00000000ffffffff > [ 46.266547] x1 : ffff000177e2a000 x0 : 0000000000000000 > [ 46.271856] Call trace: > [ 46.274302] stmmac_xmit+0x7a0/0x9d0 > [ 46.277874] dev_hard_start_xmit+0x94/0x158 > [ 46.282056] sch_direct_xmit+0x11c/0x338 > [ 46.285976] __qdisc_run+0x118/0x5f0 > [ 46.289549] net_tx_action+0x110/0x198 > [ 46.293297] __do_softirq+0x120/0x23c > [ 46.296958] irq_exit+0xb8/0xd8 > [ 46.300098] __handle_domain_irq+0x64/0xb8 > [ 46.304191] gic_handle_irq+0x5c/0x148 > [ 46.307936] el1_irq+0xb8/0x180 > [ 46.311076] cpuidle_enter_state+0x84/0x360 > [ 46.315256] cpuidle_enter+0x34/0x48 > [ 46.318829] call_cpuidle+0x18/0x38 > [ 46.322314] do_idle+0x1e0/0x280 > [ 46.325539] cpu_startup_entry+0x24/0x40 > [ 46.329460] rest_init+0xd4/0xe0 > [ 46.332687] arch_call_rest_init+0xc/0x14 > [ 46.336695] start_kernel+0x420/0x44c > [ 46.340353] ---[ end trace bc1ee695123cbacd ]--- > > Signed-off-by: Fugang Duan <fugang.duan@....com> > --- > drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > index 73677c3b33b6..3c0a2d8765f9 100644 > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > @@ -1548,6 +1548,15 @@ static void dma_free_tx_skbufs(struct > stmmac_priv *priv, u32 queue) > stmmac_free_tx_buffer(priv, queue, i); } > > +static void stmmac_free_tx_skbufs(struct stmmac_priv *priv) { > + u32 tx_queue_cnt = priv->plat->tx_queues_to_use; > + u32 queue; > + > + for (queue = 0; queue < tx_queue_cnt; queue++) > + dma_free_tx_skbufs(priv, queue); > +} > + > /** > * free_dma_rx_desc_resources - free RX dma desc resources > * @priv: private structure > @@ -5186,6 +5195,7 @@ int stmmac_resume(struct device *dev) > > stmmac_reset_queues_param(priv); > > + stmmac_free_tx_skbufs(priv); > stmmac_clear_descriptors(priv); > > stmmac_hw_setup(ndev, false); > -- > 2.17.1
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