netdev - Re: [PATCH 2/4 v2 net-next] net: stmmac: adding multiple buffers for RX (fwd)

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Date:   Thu, 6 Apr 2017 07:29:13 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Joao Pinto <Joao.Pinto@...opsys.com>
cc:     davem@...emloft.net, clabbe.montjoie@...il.com, treding@...dia.com,
        niklas.cassel@...s.com, netdev@...r.kernel.org,
        Joao Pinto <Joao.Pinto@...opsys.com>, kbuild-all@...org
Subject: Re: [PATCH 2/4 v2 net-next] net: stmmac: adding multiple buffers
 for RX (fwd)

It looks like an infinite loop, if queue is unsigned.

julia

---------- Forwarded message ----------
Date: Thu, 6 Apr 2017 11:49:01 +0800
From: kbuild test robot <fengguang.wu@...el.com>
To: kbuild@...org
Cc: Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH 2/4 v2 net-next] net: stmmac: adding multiple buffers for RX

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Joao-Pinto/net-stmmac-break-some-functions-into-RX-and-TX-scopes/20170406-081523
:::::: branch date: 4 hours ago
:::::: commit date: 4 hours ago

   drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2852:15-20: WARNING: Unsigned expression compared with zero: entry < 0
>> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:1190:8-13: WARNING: Unsigned expression compared with zero: queue >= 0

git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout b403b5806dca0f85904ddc6cf2241286da86ed9b
vim +1190 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

b6ad2502 Joao Pinto         2017-04-05  1174  			if (priv->extend_desc)
b403b580 Joao Pinto         2017-04-05  1175  				priv->hw->mode->init(rx_q->dma_erx,
b403b580 Joao Pinto         2017-04-05  1176  						     rx_q->dma_rx_phy,
e3ad57c9 Giuseppe Cavallaro 2016-02-29  1177  						     DMA_RX_SIZE, 1);
b6ad2502 Joao Pinto         2017-04-05  1178  			else
b403b580 Joao Pinto         2017-04-05  1179  				priv->hw->mode->init(rx_q->dma_rx,
b403b580 Joao Pinto         2017-04-05  1180  						     rx_q->dma_rx_phy,
e3ad57c9 Giuseppe Cavallaro 2016-02-29  1181  						     DMA_RX_SIZE, 0);
b6ad2502 Joao Pinto         2017-04-05  1182  		}
b403b580 Joao Pinto         2017-04-05  1183  	}
b403b580 Joao Pinto         2017-04-05  1184
b403b580 Joao Pinto         2017-04-05  1185  	buf_sz = bfsize;
b6ad2502 Joao Pinto         2017-04-05  1186
b6ad2502 Joao Pinto         2017-04-05  1187  	return 0;
b403b580 Joao Pinto         2017-04-05  1188
b6ad2502 Joao Pinto         2017-04-05  1189  err_init_rx_buffers:
b403b580 Joao Pinto         2017-04-05 @1190  	while (queue >= 0) {
b6ad2502 Joao Pinto         2017-04-05  1191  		while (--i >= 0)
b403b580 Joao Pinto         2017-04-05  1192  			stmmac_free_rx_buffer(priv, queue, i);
b403b580 Joao Pinto         2017-04-05  1193
b403b580 Joao Pinto         2017-04-05  1194  		i = DMA_RX_SIZE;
b403b580 Joao Pinto         2017-04-05  1195  		queue--;
b403b580 Joao Pinto         2017-04-05  1196  	}
b403b580 Joao Pinto         2017-04-05  1197
b6ad2502 Joao Pinto         2017-04-05  1198  	return ret;

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