From: Peter Crosthwaite <[email protected]> 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 <[email protected]> Tested-by: Jason Wu <[email protected]> Acked-by: Michal Simek <[email protected]> Signed-off-by: Michal Simek <[email protected]> --- drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c index a4840952d372..b83425393a24 100644 --- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c +++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c @@ -809,6 +809,7 @@ static irqreturn_t axienet_tx_irq(int irq, void *_ndev) status = axienet_dma_in32(lp, XAXIDMA_TX_SR_OFFSET); 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); 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); tasklet_schedule(&lp->dma_err_tasklet); + axienet_dma_out32(lp, XAXIDMA_TX_SR_OFFSET, status); } out: - axienet_dma_out32(lp, XAXIDMA_TX_SR_OFFSET, status); 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); if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) { + axienet_dma_out32(lp, XAXIDMA_RX_SR_OFFSET, status); axienet_recv(lp->ndev); 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); tasklet_schedule(&lp->dma_err_tasklet); + axienet_dma_out32(lp, XAXIDMA_RX_SR_OFFSET, status); } out: - axienet_dma_out32(lp, XAXIDMA_RX_SR_OFFSET, status); return IRQ_HANDLED; } -- 2.3.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
