From: Jia-Ju Bai Date: Sat, 15 Sep 2018 04:02:46 +0000 (+0800) Subject: net: socionext: Fix two sleep-in-atomic-context bugs in ave_rxfifo_reset() X-Git-Tag: microblaze-v5.0-rc1~24^2~351 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=0020f5c807ef67954d9210eea0ba17a6134cdf7d;p=linux-2.6-microblaze.git 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 Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/socionext/sni_ave.c b/drivers/net/ethernet/socionext/sni_ave.c index 61e6abb966ac..2a156dcd4534 100644 --- a/drivers/net/ethernet/socionext/sni_ave.c +++ b/drivers/net/ethernet/socionext/sni_ave.c @@ -895,11 +895,11 @@ 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);