* [patch] net: sxgbe: fix error handling in init_rx_ring()
[not found] <20150116071229.GH5520@mwanda>
@ 2015-02-05 8:00 ` Dan Carpenter
2015-02-06 20:50 ` David Miller
0 siblings, 1 reply; 2+ messages in thread
From: Dan Carpenter @ 2015-02-05 8:00 UTC (permalink / raw)
To: Byungho An, kgene; +Cc: Girish K S, Vipul Pandya, netdev, kernel-janitors
There are a couple bugs with the error handling in this function.
1) If we can't allocate "rx_ring->rx_skbuff" then we should call
dma_free_coherent() but we don't.
2) free_rx_ring() frees "rx_ring->rx_skbuff_dma" and "rx_ring->rx_skbuff"
so calling it in a loop causes a double free.
Also it was a bit confusing how we sometimes freed things before doing
the goto. I've cleaned it up so it does error handling in normal kernel
style.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c b/drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c
index 11288d4..c8a01ee 100644
--- a/drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c
+++ b/drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c
@@ -364,6 +364,26 @@ static int sxgbe_init_rx_buffers(struct net_device *dev,
return 0;
}
+
+/**
+ * sxgbe_free_rx_buffers - free what sxgbe_init_rx_buffers() allocated
+ * @dev: net device structure
+ * @rx_ring: ring to be freed
+ * @rx_rsize: ring size
+ * Description: this function initializes the DMA RX descriptor
+ */
+static void sxgbe_free_rx_buffers(struct net_device *dev,
+ struct sxgbe_rx_norm_desc *p, int i,
+ unsigned int dma_buf_sz,
+ struct sxgbe_rx_queue *rx_ring)
+{
+ struct sxgbe_priv_data *priv = netdev_priv(dev);
+
+ kfree_skb(rx_ring->rx_skbuff[i]);
+ dma_unmap_single(priv->device, rx_ring->rx_skbuff_dma[i],
+ dma_buf_sz, DMA_FROM_DEVICE);
+}
+
/**
* init_tx_ring - init the TX descriptor ring
* @dev: net device structure
@@ -456,7 +476,7 @@ static int init_rx_ring(struct net_device *dev, u8 queue_no,
/* RX ring is not allcoated */
if (rx_ring = NULL) {
netdev_err(dev, "No memory for RX queue\n");
- goto error;
+ return -ENOMEM;
}
/* assign queue number */
@@ -468,23 +488,21 @@ static int init_rx_ring(struct net_device *dev, u8 queue_no,
&rx_ring->dma_rx_phy, GFP_KERNEL);
if (rx_ring->dma_rx = NULL)
- goto error;
+ return -ENOMEM;
/* allocate memory for RX skbuff array */
rx_ring->rx_skbuff_dma = kmalloc_array(rx_rsize,
sizeof(dma_addr_t), GFP_KERNEL);
if (!rx_ring->rx_skbuff_dma) {
- dma_free_coherent(priv->device,
- rx_rsize * sizeof(struct sxgbe_rx_norm_desc),
- rx_ring->dma_rx, rx_ring->dma_rx_phy);
- goto error;
+ ret = -ENOMEM;
+ goto err_free_dma_rx;
}
rx_ring->rx_skbuff = kmalloc_array(rx_rsize,
sizeof(struct sk_buff *), GFP_KERNEL);
if (!rx_ring->rx_skbuff) {
- kfree(rx_ring->rx_skbuff_dma);
- goto error;
+ ret = -ENOMEM;
+ goto err_free_skbuff_dma;
}
/* initialise the buffers */
@@ -494,7 +512,7 @@ static int init_rx_ring(struct net_device *dev, u8 queue_no,
ret = sxgbe_init_rx_buffers(dev, p, desc_index,
bfsize, rx_ring);
if (ret)
- goto err_init_rx_buffers;
+ goto err_free_rx_buffers;
}
/* initalise counters */
@@ -504,11 +522,22 @@ static int init_rx_ring(struct net_device *dev, u8 queue_no,
return 0;
-err_init_rx_buffers:
- while (--desc_index >= 0)
- free_rx_ring(priv->device, rx_ring, desc_index);
-error:
- return -ENOMEM;
+err_free_rx_buffers:
+ while (--desc_index >= 0) {
+ struct sxgbe_rx_norm_desc *p;
+
+ p = rx_ring->dma_rx + desc_index;
+ sxgbe_free_rx_buffers(dev, p, desc_index, bfsize, rx_ring);
+ }
+ kfree(rx_ring->rx_skbuff);
+err_free_skbuff_dma:
+ kfree(rx_ring->rx_skbuff_dma);
+err_free_dma_rx:
+ dma_free_coherent(priv->device,
+ rx_rsize * sizeof(struct sxgbe_rx_norm_desc),
+ rx_ring->dma_rx, rx_ring->dma_rx_phy);
+
+ return ret;
}
/**
* free_tx_ring - free the TX descriptor ring
^ permalink raw reply related [flat|nested] 2+ messages in thread