Hi all,
Could someone please review this?
On Fri, Mar 18, 2016 at 1:27 PM, Julian Calaby <julian.calaby@xxxxxxxxx> wrote:
> From: Jia-Ju Bai <baijiaju1990@xxxxxxx>
>
> When dev_alloc_skb or pci_dma_mapping_error in rtl8180_init_rx_ring fails,
> the memory allocated by pci_zalloc_consistent is not freed.
>
> This patch fixes the bug by adding pci_free_consistent
> in error handling code.
>
> Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxx>
> Signed-off-by: Julian Calaby <julian.calaby@xxxxxxxxx>
>
> ---
>
> Could someone else please review this?
>
> In particular, immediately after the call to pci_zalloc_coherent(), it
> fails if the result is null or if '(unsigned long)result & 0xFF'.
>
> Is the second arm of the or statement possible, and if so, should we be
> pci_free_coherent()ing the result there too?
And could someone please comment on this? It doesn't seem correct to
me, however I don't know much about PCI / DMA etc.
> I've had a quick scout around and this check seems to be particular to
> realtek drivers.
>
> Thanks,
>
> Julian Calaby
> ---
> drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c b/drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c
> index c76af5d..a8a23d5 100644
> --- a/drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c
> +++ b/drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c
> @@ -1018,6 +1018,8 @@ static int rtl8180_init_rx_ring(struct ieee80211_hw *dev)
> dma_addr_t *mapping;
> entry = priv->rx_ring + priv->rx_ring_sz*i;
> if (!skb) {
> + pci_free_consistent(priv->pdev, priv->rx_ring_sz * 32,
> + priv->rx_ring, priv->rx_ring_dma);
> wiphy_err(dev->wiphy, "Cannot allocate RX skb\n");
> return -ENOMEM;
> }
> @@ -1028,6 +1030,8 @@ static int rtl8180_init_rx_ring(struct ieee80211_hw *dev)
>
> if (pci_dma_mapping_error(priv->pdev, *mapping)) {
> kfree_skb(skb);
> + pci_free_consistent(priv->pdev, priv->rx_ring_sz * 32,
> + priv->rx_ring, priv->rx_ring_dma);
> wiphy_err(dev->wiphy, "Cannot map DMA for RX skb\n");
> return -ENOMEM;
> }
> --
> 2.7.0
>
--
Julian Calaby
Email: julian.calaby@xxxxxxxxx
Profile: http://www.google.com/profiles/julian.calaby/
--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
