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lan743x: fix return value for lan743x_tx_napi_poll

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[ Upstream commit cc59220541 ]

The lan743x driver, when under heavy traffic load, has been noticed
to sometimes hang, or cause a kernel panic.

Debugging reveals that the TX napi poll routine was returning
the wrong value, 'weight'. Most other drivers return 0.
And call napi_complete, instead of napi_complete_done.

Additionally when creating the tx napi poll routine.
Changed netif_napi_add, to netif_tx_napi_add.

Updates for v3:
    changed 'fixes' tag to match defined format

Updates for v2:
use napi_complete, instead of napi_complete_done in
    lan743x_tx_napi_poll
use netif_tx_napi_add, instead of netif_napi_add for
    registration of tx napi poll routine

fixes: 23f0703c12 ("lan743x: Add main source files for new lan743x driver")
Signed-off-by: Bryan Whitehead <Bryan.Whitehead@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bryan Whitehead
2018-11-26 12:04:57 -05:00
committed by Greg Kroah-Hartman
parent 767d890331
commit 18dd9bf513
1 changed files with 5 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/net/ethernet/microchip/lan743x_main.c
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@@ -1675,7 +1675,7 @@ static int lan743x_tx_napi_poll(struct napi_struct *napi, int weight)
netif_wake_queue(adapter->netdev);
}
if (!napi_complete_done(napi, weight))
if (!napi_complete(napi))
goto done;
/* enable isr */
@@ -1684,7 +1684,7 @@ static int lan743x_tx_napi_poll(struct napi_struct *napi, int weight)
lan743x_csr_read(adapter, INT_STS);
done:
return weight;
return 0;
}
static void lan743x_tx_ring_cleanup(struct lan743x_tx *tx)
@@ -1873,9 +1873,9 @@ static int lan743x_tx_open(struct lan743x_tx *tx)
tx->vector_flags = lan743x_intr_get_vector_flags(adapter,
INT_BIT_DMA_TX_
(tx->channel_number));
netif_napi_add(adapter->netdev,
&tx->napi, lan743x_tx_napi_poll,
tx->ring_size - 1);
netif_tx_napi_add(adapter->netdev,
&tx->napi, lan743x_tx_napi_poll,
tx->ring_size - 1);
napi_enable(&tx->napi);
data = 0;