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net: socionext: Fix two sleep-in-atomic-context bugs in ave_rxfifo_reset()
The driver may sleep with holding a spinlock. The function call paths (from bottom to top) in Linux-4.17 are: [FUNC] usleep_range drivers/net/ethernet/socionext/sni_ave.c, 892: usleep_range in ave_rxfifo_reset drivers/net/ethernet/socionext/sni_ave.c, 932: ave_rxfifo_reset in ave_irq_handler [FUNC] usleep_range drivers/net/ethernet/socionext/sni_ave.c, 888: usleep_range in ave_rxfifo_reset drivers/net/ethernet/socionext/sni_ave.c, 932: ave_rxfifo_reset in ave_irq_handler To fix these bugs, usleep_range() is replaced with udelay(). These bugs are found by my static analysis tool DSAC. Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 2 additions and 2 deletions
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@ -895,11 +895,11 @@ static void ave_rxfifo_reset(struct net_device *ndev)
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/* assert reset */
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/* assert reset */
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writel(AVE_GRR_RXFFR, priv->base + AVE_GRR);
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writel(AVE_GRR_RXFFR, priv->base + AVE_GRR);
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usleep_range(40, 50);
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udelay(50);
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/* negate reset */
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/* negate reset */
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writel(0, priv->base + AVE_GRR);
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writel(0, priv->base + AVE_GRR);
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usleep_range(10, 20);
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udelay(20);
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/* negate interrupt status */
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/* negate interrupt status */
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writel(AVE_GI_RXOVF, priv->base + AVE_GISR);
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writel(AVE_GI_RXOVF, priv->base + AVE_GISR);
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