Please ignore this one!
I'll send a v2.

On 24.06.2020 10:26, Claudiu Beznea wrote:
> DMA buffers were not freed on failure path of at91ether_open().
> Along with changes for freeing the DMA buffers the enable/disable
> interrupt instructions were moved to at91ether_start()/at91ether_stop()
> functions and the operations on at91ether_stop() were done in
> their reverse order (compared with how is done in at91ether_start()):
> before this patch the operation order on interface open path
> was as follows:
> 1/ alloc DMA buffers
> 2/ enable tx, rx
> 3/ enable interrupts
> and the order on interface close path was as follows:
> 1/ disable tx, rx
> 2/ disable interrupts
> 3/ free dma buffers.
> 
> Fixes: 7897b071ac3b ("net: macb: convert to phylink")
> Signed-off-by: Claudiu Beznea <claudiu.bez...@microchip.com>
> ---
>  drivers/net/ethernet/cadence/macb_main.c | 116 
> +++++++++++++++++++------------
>  1 file changed, 73 insertions(+), 43 deletions(-)
> 
> diff --git a/drivers/net/ethernet/cadence/macb_main.c 
> b/drivers/net/ethernet/cadence/macb_main.c
> index 5705359a3612..52582e8ed90e 100644
> --- a/drivers/net/ethernet/cadence/macb_main.c
> +++ b/drivers/net/ethernet/cadence/macb_main.c
> @@ -3762,15 +3762,9 @@ static int macb_init(struct platform_device *pdev)
>  
>  static struct sifive_fu540_macb_mgmt *mgmt;
>  
> -/* Initialize and start the Receiver and Transmit subsystems */
> -static int at91ether_start(struct net_device *dev)
> +static int at91ether_alloc_coherent(struct macb *lp)
>  {
> -     struct macb *lp = netdev_priv(dev);
>       struct macb_queue *q = &lp->queues[0];
> -     struct macb_dma_desc *desc;
> -     dma_addr_t addr;
> -     u32 ctl;
> -     int i;
>  
>       q->rx_ring = dma_alloc_coherent(&lp->pdev->dev,
>                                        (AT91ETHER_MAX_RX_DESCR *
> @@ -3792,6 +3786,43 @@ static int at91ether_start(struct net_device *dev)
>               return -ENOMEM;
>       }
>  
> +     return 0;
> +}
> +
> +static void at91ether_free_coherent(struct macb *lp)
> +{
> +     struct macb_queue *q = &lp->queues[0];
> +
> +     if (q->rx_ring) {
> +             dma_free_coherent(&lp->pdev->dev,
> +                               AT91ETHER_MAX_RX_DESCR *
> +                               macb_dma_desc_get_size(lp),
> +                               q->rx_ring, q->rx_ring_dma);
> +             q->rx_ring = NULL;
> +     }
> +
> +     if (q->rx_buffers) {
> +             dma_free_coherent(&lp->pdev->dev,
> +                               AT91ETHER_MAX_RX_DESCR *
> +                               AT91ETHER_MAX_RBUFF_SZ,
> +                               q->rx_buffers, q->rx_buffers_dma);
> +             q->rx_buffers = NULL;
> +     }
> +}
> +
> +/* Initialize and start the Receiver and Transmit subsystems */
> +static int at91ether_start(struct macb *lp)
> +{
> +     struct macb_queue *q = &lp->queues[0];
> +     struct macb_dma_desc *desc;
> +     dma_addr_t addr;
> +     u32 ctl;
> +     int i, ret;
> +
> +     ret = at91ether_alloc_coherent(lp);
> +     if (ret)
> +             return ret;
> +
>       addr = q->rx_buffers_dma;
>       for (i = 0; i < AT91ETHER_MAX_RX_DESCR; i++) {
>               desc = macb_rx_desc(q, i);
> @@ -3813,9 +3844,39 @@ static int at91ether_start(struct net_device *dev)
>       ctl = macb_readl(lp, NCR);
>       macb_writel(lp, NCR, ctl | MACB_BIT(RE) | MACB_BIT(TE));
>  
> +     /* Enable MAC interrupts */
> +     macb_writel(lp, IER, MACB_BIT(RCOMP)    |
> +                          MACB_BIT(RXUBR)    |
> +                          MACB_BIT(ISR_TUND) |
> +                          MACB_BIT(ISR_RLE)  |
> +                          MACB_BIT(TCOMP)    |
> +                          MACB_BIT(ISR_ROVR) |
> +                          MACB_BIT(HRESP));
> +
>       return 0;
>  }
>  
> +static void at91ether_stop(struct macb *lp)
> +{
> +     u32 ctl;
> +
> +     /* Disable MAC interrupts */
> +     macb_writel(lp, IDR, MACB_BIT(RCOMP)    |
> +                          MACB_BIT(RXUBR)    |
> +                          MACB_BIT(ISR_TUND) |
> +                          MACB_BIT(ISR_RLE)  |
> +                          MACB_BIT(TCOMP)    |
> +                          MACB_BIT(ISR_ROVR) |
> +                          MACB_BIT(HRESP));
> +
> +     /* Disable Receiver and Transmitter */
> +     ctl = macb_readl(lp, NCR);
> +     macb_writel(lp, NCR, ctl & ~(MACB_BIT(TE) | MACB_BIT(RE)));
> +
> +     /* Free resources. */
> +     at91ether_free_coherent(lp);
> +}
> +
>  /* Open the ethernet interface */
>  static int at91ether_open(struct net_device *dev)
>  {
> @@ -3835,27 +3896,20 @@ static int at91ether_open(struct net_device *dev)
>  
>       macb_set_hwaddr(lp);
>  
> -     ret = at91ether_start(dev);
> +     ret = at91ether_start(lp);
>       if (ret)
>               goto pm_exit;
>  
> -     /* Enable MAC interrupts */
> -     macb_writel(lp, IER, MACB_BIT(RCOMP)    |
> -                          MACB_BIT(RXUBR)    |
> -                          MACB_BIT(ISR_TUND) |
> -                          MACB_BIT(ISR_RLE)  |
> -                          MACB_BIT(TCOMP)    |
> -                          MACB_BIT(ISR_ROVR) |
> -                          MACB_BIT(HRESP));
> -
>       ret = macb_phylink_connect(lp);
>       if (ret)
> -             goto pm_exit;
> +             goto stop;
>  
>       netif_start_queue(dev);
>  
>       return 0;
>  
> +stop:
> +     at91ether_stop(lp);
>  pm_exit:
>       pm_runtime_put_sync(&lp->pdev->dev);
>       return ret;
> @@ -3865,37 +3919,13 @@ static int at91ether_open(struct net_device *dev)
>  static int at91ether_close(struct net_device *dev)
>  {
>       struct macb *lp = netdev_priv(dev);
> -     struct macb_queue *q = &lp->queues[0];
> -     u32 ctl;
> -
> -     /* Disable Receiver and Transmitter */
> -     ctl = macb_readl(lp, NCR);
> -     macb_writel(lp, NCR, ctl & ~(MACB_BIT(TE) | MACB_BIT(RE)));
> -
> -     /* Disable MAC interrupts */
> -     macb_writel(lp, IDR, MACB_BIT(RCOMP)    |
> -                          MACB_BIT(RXUBR)    |
> -                          MACB_BIT(ISR_TUND) |
> -                          MACB_BIT(ISR_RLE)  |
> -                          MACB_BIT(TCOMP)    |
> -                          MACB_BIT(ISR_ROVR) |
> -                          MACB_BIT(HRESP));
>  
>       netif_stop_queue(dev);
>  
>       phylink_stop(lp->phylink);
>       phylink_disconnect_phy(lp->phylink);
>  
> -     dma_free_coherent(&lp->pdev->dev,
> -                       AT91ETHER_MAX_RX_DESCR *
> -                       macb_dma_desc_get_size(lp),
> -                       q->rx_ring, q->rx_ring_dma);
> -     q->rx_ring = NULL;
> -
> -     dma_free_coherent(&lp->pdev->dev,
> -                       AT91ETHER_MAX_RX_DESCR * AT91ETHER_MAX_RBUFF_SZ,
> -                       q->rx_buffers, q->rx_buffers_dma);
> -     q->rx_buffers = NULL;
> +     at91ether_stop(lp);
>  
>       return pm_runtime_put(&lp->pdev->dev);
>  }
> 

Reply via email to