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| author |   Jia-Ju Bai <baijiaju1990@gmail.com> | 2018-09-15 12:02:46 +0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-09-17 19:02:44 -0700 |
| commit | 0020f5c807ef67954d9210eea0ba17a6134cdf7d (patch) | |
| tree | 36576ce9cca10d37f4cda781684b39e97d5ef92f /drivers | |
| parent | net: caif: remove redundant null check on frontpkt (diff) | |
| download | linux-dev-0020f5c807ef67954d9210eea0ba17a6134cdf7d.tar.xz linux-dev-0020f5c807ef67954d9210eea0ba17a6134cdf7d.zip | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/socionext/sni_ave.c | 4 |
1 files changed, 2 insertions, 2 deletions
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); |