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| author | Jia-Ju Bai <baijiaju1990@gmail.com> | 2018-09-01 20:11:05 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-09-02 16:05:25 -0700 |
| commit | 16fe10cf92783ed9ceb182d6ea2b8adf5e8ec1b8 (patch) | |
| tree | dc652a85653af60c212ca20262c6d01e092a946d | |
| parent | a80afe89d81af6b64bf2d9b3afef70dcf75df12b (diff) | |
| download | linux-16fe10cf92783ed9ceb182d6ea2b8adf5e8ec1b8.tar.bz2 | |
net: cadence: Fix a sleep-in-atomic-context bug in macb_halt_tx()
The kernel module may sleep with holding a spinlock.
The function call paths (from bottom to top) in Linux-4.16 are:
[FUNC] usleep_range
drivers/net/ethernet/cadence/macb_main.c, 648:
usleep_range in macb_halt_tx
drivers/net/ethernet/cadence/macb_main.c, 730:
macb_halt_tx in macb_tx_error_task
drivers/net/ethernet/cadence/macb_main.c, 721:
_raw_spin_lock_irqsave in macb_tx_error_task
To fix this bug, usleep_range() is replaced with udelay().
This bug is 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>
| -rw-r--r-- | drivers/net/ethernet/cadence/macb_main.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c index c6707ea2d751..16e4ef7d7185 100644 --- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -649,7 +649,7 @@ static int macb_halt_tx(struct macb *bp) if (!(status & MACB_BIT(TGO))) return 0; - usleep_range(10, 250); + udelay(250); } while (time_before(halt_time, timeout)); return -ETIMEDOUT; |