net: lantiq: disable interrupt before sheduling NAPI

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[ Upstream commit f2386cf7c5 ]

This patch fixes TX hangs with threaded NAPI enabled. The scheduled
NAPI seems to be executed in parallel with the interrupt on second
thread. Sometimes it happens that ltq_dma_disable_irq() is executed
after xrx200_tx_housekeeping(). The symptom is that TX interrupts
are disabled in the DMA controller. As a result, the TX hangs after
a few seconds of the iperf test. Scheduling NAPI after disabling
interrupts fixes this issue.

Tested on Lantiq xRX200 (BT Home Hub 5A).

Fixes: 9423361da5 ("net: lantiq: Disable IRQs only if NAPI gets scheduled ")
Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Aleksander Jan Bajkowski 2021-06-08 23:21:07 +02:00 • committed by Greg Kroah-Hartman

parent db5f4adc93

commit 5cea03aef6

1 changed files with 1 additions and 1 deletions

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drivers/net/ethernet/lantiq_xrx200.c

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