net: ethernet: cavium: use div64_u64() instead of do_div()

do_div() does a 64-by-32 division.
When the divisor is u64, do_div() truncates it to 32 bits, this means it
can test non-zero and be truncated to zero for division.

fix do_div.cocci warning:
do_div() does a 64-by-32 division, please consider using div64_u64 instead.

Signed-off-by: Wang Qing <wangqing@vivo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/cavium/liquidio/lio_main.c b/drivers/net/ethernet/cavium/liquidio/lio_main.c
index ba28aa4..8e07192 100644 (file)
--- a/drivers/net/ethernet/cavium/liquidio/lio_main.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_main.c
@@ -1539,7 +1539,7 @@ static int liquidio_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
         * compute the delta in terms of coprocessor clocks.
         */
        delta = (u64)ppb << 32;
-       do_div(delta, oct->coproc_clock_rate);
+       div64_u64(delta, oct->coproc_clock_rate);
 
        spin_lock_irqsave(&lio->ptp_lock, flags);
        comp = lio_pci_readq(oct, CN6XXX_MIO_PTP_CLOCK_COMP);
@@ -1672,7 +1672,7 @@ static void liquidio_ptp_init(struct octeon_device *oct)
        u64 clock_comp, cfg;
 
        clock_comp = (u64)NSEC_PER_SEC << 32;
-       do_div(clock_comp, oct->coproc_clock_rate);
+       div64_u64(clock_comp, oct->coproc_clock_rate);
        lio_pci_writeq(oct, clock_comp, CN6XXX_MIO_PTP_CLOCK_COMP);
 
        /* Enable */