diff options
| author | Ilias Apalodimas <ilias.apalodimas@linaro.org> | 2018-10-11 15:28:26 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-10-11 12:04:08 -0700 |
| commit | 2a1e89df785082a0fd7264ca6d3d834abe84fa25 (patch) | |
| tree | a3d7e659ba40da4b3aff973ece4e3b40c38262c6 /drivers/net/ethernet/socionext | |
| parent | 26450608348e91a782691dbfcc836478f4381071 (diff) | |
| download | linux-2a1e89df785082a0fd7264ca6d3d834abe84fa25.tar.bz2 | |
net: socionext: clear rx irq correctly
commit 63ae7949e94a ("net: socionext: Use descriptor info instead of MMIO reads on Rx")
removed constant mmio reads from the driver and started using a descriptor
field to check if packet should be processed.
This lead the napi rx handler being constantly called while no packets
needed processing and ksoftirq getting 100% cpu usage. Issue one mmio read
to clear the irq correcty after processing packets
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reported-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/socionext')
| -rw-r--r-- | drivers/net/ethernet/socionext/netsec.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/net/ethernet/socionext/netsec.c b/drivers/net/ethernet/socionext/netsec.c index 7aa5ebb6766c..4289ccb26e4e 100644 --- a/drivers/net/ethernet/socionext/netsec.c +++ b/drivers/net/ethernet/socionext/netsec.c @@ -735,8 +735,11 @@ static int netsec_process_rx(struct netsec_priv *priv, int budget) u16 idx = dring->tail; struct netsec_de *de = dring->vaddr + (DESC_SZ * idx); - if (de->attr & (1U << NETSEC_RX_PKT_OWN_FIELD)) + if (de->attr & (1U << NETSEC_RX_PKT_OWN_FIELD)) { + /* reading the register clears the irq */ + netsec_read(priv, NETSEC_REG_NRM_RX_PKTCNT); break; + } /* This barrier is needed to keep us from reading * any other fields out of the netsec_de until we have |