From: Antoine Tenart Date: Mon, 23 Oct 2017 13:24:31 +0000 (+0200) Subject: net: mvpp2: do not call txq_done from the Tx path when Tx irqs are used X-Git-Tag: v4.14-rc7~1^2~32 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=082297e61480c4d72ed75b31077e74aca0e7c799;p=platform%2Fkernel%2Flinux-exynos.git net: mvpp2: do not call txq_done from the Tx path when Tx irqs are used When Tx IRQs are used, txq_bufs_free() can be called from both the Tx path and from NAPI poll(). This led to CPU stalls as if these two tasks (Tx and Poll) are scheduled on two CPUs at the same time, DMA unmapping operations are done on the same txq buffers. This patch adds a check not to call txq_done() from the Tx path if Tx interrupts are used as it does not make sense to do so. Fixes: edc660fa09e2 ("net: mvpp2: replace TX coalescing interrupts with hrtimer") Signed-off-by: Antoine Tenart Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/marvell/mvpp2.c b/drivers/net/ethernet/marvell/mvpp2.c index 3de05a8..28c6e8a 100644 --- a/drivers/net/ethernet/marvell/mvpp2.c +++ b/drivers/net/ethernet/marvell/mvpp2.c @@ -6499,7 +6499,7 @@ out: } /* Finalize TX processing */ - if (txq_pcpu->count >= txq->done_pkts_coal) + if (!port->has_tx_irqs && txq_pcpu->count >= txq->done_pkts_coal) mvpp2_txq_done(port, txq, txq_pcpu); /* Set the timer in case not all frags were processed */