AuxXxilium/linux_dsm_epyc7002
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net: axienet: Service completion interrupts ASAP

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The packet completion interrupts for TX and RX should be serviced before
the packets are consumed. This ensures against the degenerate case when a
new completion interrupt is raised after the handler has exited but before
the interrupts are cleared. In this case its possible for the ISR to clear
an unhandled interrupt (leading to potential deadlock).

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Tested-by: Jason Wu <huanyu@xilinx.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Peter Crosthwaite 2015-05-05 11:25:56 +02:00 committed by David S. Miller
parent 38e96b35cd
commit 80c775accd
1 changed files with 4 additions and 2 deletions
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6
drivers/net/ethernet/xilinx/xilinx_axienet_main.c
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@ -809,6 +809,7 @@ static irqreturn_t axienet_tx_irq(int irq, void *_ndev)
status = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET); status = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET);
if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) { if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) {
axienet_dma_out32(lp, XAXIDMA_TX_SR_OFFSET, status);
axienet_start_xmit_done(lp->ndev); axienet_start_xmit_done(lp->ndev);
goto out; goto out;
} }
@ -832,9 +833,9 @@ static irqreturn_t axienet_tx_irq(int irq, void *_ndev)
axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr); axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
tasklet_schedule(&lp->dma_err_tasklet); tasklet_schedule(&lp->dma_err_tasklet);
axienet_dma_out32(lp, XAXIDMA_TX_SR_OFFSET, status);
} }
out: out:
axienet_dma_out32(lp, XAXIDMA_TX_SR_OFFSET, status);
return IRQ_HANDLED; return IRQ_HANDLED;
} }
@ -857,6 +858,7 @@ static irqreturn_t axienet_rx_irq(int irq, void *_ndev)
status = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET); status = axienet_dma_in32(lp, XAXIDMA_RX_SR_OFFSET);
if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) { if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) {
axienet_dma_out32(lp, XAXIDMA_RX_SR_OFFSET, status);
axienet_recv(lp->ndev); axienet_recv(lp->ndev);
goto out; goto out;
} }
@ -880,9 +882,9 @@ static irqreturn_t axienet_rx_irq(int irq, void *_ndev)
axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr); axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
tasklet_schedule(&lp->dma_err_tasklet); tasklet_schedule(&lp->dma_err_tasklet);
axienet_dma_out32(lp, XAXIDMA_RX_SR_OFFSET, status);
} }
out: out:
axienet_dma_out32(lp, XAXIDMA_RX_SR_OFFSET, status);
return IRQ_HANDLED; return IRQ_HANDLED;
} }