Messages in this thread Patch in this message | | | From | Jia-Ju Bai <> | Subject | [PATCH] net: socionext: Fix two sleep-in-atomic-context bugs in ave_rxfifo_reset() | Date | Sat, 15 Sep 2018 12:02:46 +0800 |
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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> --- drivers/net/ethernet/socionext/sni_ave.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/socionext/sni_ave.c b/drivers/net/ethernet/socionext/sni_ave.c index f7ecceeb1e28..3c784a29ce0d 100644 --- a/drivers/net/ethernet/socionext/sni_ave.c +++ b/drivers/net/ethernet/socionext/sni_ave.c @@ -904,11 +904,11 @@ static void ave_rxfifo_reset(struct net_device *ndev) /* assert reset */ writel(AVE_GRR_RXFFR, priv->base + AVE_GRR); - usleep_range(40, 50); + udelay(50); /* negate reset */ writel(0, priv->base + AVE_GRR); - usleep_range(10, 20); + udelay(20); /* negate interrupt status */ writel(AVE_GI_RXOVF, priv->base + AVE_GISR); -- 2.17.0
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