diff options
| author |   Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2023-03-15 16:04:23 +0900 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2023-03-17 07:50:50 +0000 |
| commit | e05bb97d9c9dd4ba5739a27921044c935a7fb3be (patch) | |
| tree | d9c49c38558f3f30bd44d32d913b3d3dc1d388f7 /drivers/net/ethernet/renesas/rswitch.c | |
| parent | ethernet: sun: add check for the mdesc_grab() (diff) | |
| download | wireguard-linux-e05bb97d9c9dd4ba5739a27921044c935a7fb3be.tar.xz wireguard-linux-e05bb97d9c9dd4ba5739a27921044c935a7fb3be.zip | |
net: renesas: rswitch: Fix the output value of quote from rswitch_rx()
If the RX descriptor doesn't have any data, the output value of quote
from rswitch_rx() will be increased unexpectedily. So, fix it.
Reported-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
Fixes: 3590918b5d07 ("net: ethernet: renesas: Add support for "Ethernet Switch"")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
| -rw-r--r-- | drivers/net/ethernet/renesas/rswitch.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/net/ethernet/renesas/rswitch.c b/drivers/net/ethernet/renesas/rswitch.c index 853394e5bb8b..46d8d9c8fc19 100644 --- a/drivers/net/ethernet/renesas/rswitch.c +++ b/drivers/net/ethernet/renesas/rswitch.c @@ -702,13 +702,14 @@ static bool rswitch_rx(struct net_device *ndev, int *quota) u16 pkt_len; u32 get_ts; + if (*quota <= 0) + return true; + boguscnt = min_t(int, gq->ring_size, *quota); limit = boguscnt; desc = &gq->rx_ring[gq->cur]; while ((desc->desc.die_dt & DT_MASK) != DT_FEMPTY) { - if (--boguscnt < 0) - break; dma_rmb(); pkt_len = le16_to_cpu(desc->desc.info_ds) & RX_DS; skb = gq->skbs[gq->cur]; @@ -734,6 +735,9 @@ static bool rswitch_rx(struct net_device *ndev, int *quota) gq->cur = rswitch_next_queue_index(gq, true, 1); desc = &gq->rx_ring[gq->cur]; + + if (--boguscnt <= 0) + break; } num = rswitch_get_num_cur_queues(gq); @@ -745,7 +749,7 @@ static bool rswitch_rx(struct net_device *ndev, int *quota) goto err; gq->dirty = rswitch_next_queue_index(gq, false, num); - *quota -= limit - (++boguscnt); + *quota -= limit - boguscnt; return boguscnt <= 0; |