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BNX2: fix a Null Pointer for stats_blk

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we have two processes to do:
P1#: ifconfig eth0 down; which will call bnx2_close, then will
, and set Null to stats_blk
P2#: ifconfig eth0; which will call bnx2_get_stats64, it will
use stats_blk.
In one case:
    --P1#--                   --P2#--
                              stats_blk(no null)
    bnx2_free_mem
    ->bp->stats_blk = NULL
                              GET_64BIT_NET_STATS

then it will cause 'NULL Pointer' Problem.
it is as well with 'ethtool -S ethx'.

Allocate the statistics block at probe time so that this problem is
impossible

Signed-off-by: Wang Weidong <wangweidong1@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
wangweidong 2015-10-08 18:03:47 +08:00 committed by David S. Miller
parent e446f9dfe1
commit 8fae307c8f
2 changed files with 53 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

79
drivers/net/ethernet/broadcom/bnx2.c
View File

@ -812,6 +812,46 @@ bnx2_alloc_rx_mem(struct bnx2 *bp)
return 0;
}
static void
bnx2_free_stats_blk(struct net_device *dev)
{
struct bnx2 *bp = netdev_priv(dev);
if (bp->status_blk) {
dma_free_coherent(&bp->pdev->dev, bp->status_stats_size,
bp->status_blk,
bp->status_blk_mapping);
bp->status_blk = NULL;
bp->stats_blk = NULL;
}
}
static int
bnx2_alloc_stats_blk(struct net_device *dev)
{
int status_blk_size;
void *status_blk;
struct bnx2 *bp = netdev_priv(dev);
/* Combine status and statistics blocks into one allocation. */
status_blk_size = L1_CACHE_ALIGN(sizeof(struct status_block));
if (bp->flags & BNX2_FLAG_MSIX_CAP)
status_blk_size = L1_CACHE_ALIGN(BNX2_MAX_MSIX_HW_VEC *
BNX2_SBLK_MSIX_ALIGN_SIZE);
bp->status_stats_size = status_blk_size +
sizeof(struct statistics_block);
status_blk = dma_zalloc_coherent(&bp->pdev->dev, bp->status_stats_size,
&bp->status_blk_mapping, GFP_KERNEL);
if (status_blk == NULL)
return -ENOMEM;
bp->status_blk = status_blk;
bp->stats_blk = status_blk + status_blk_size;
bp->stats_blk_mapping = bp->status_blk_mapping + status_blk_size;
return 0;
}
static void
bnx2_free_mem(struct bnx2 *bp)
{
@ -829,37 +869,19 @@ bnx2_free_mem(struct bnx2 *bp)
bp->ctx_blk[i] = NULL;
}
}
if (bnapi->status_blk.msi) {
dma_free_coherent(&bp->pdev->dev, bp->status_stats_size,
bnapi->status_blk.msi,
bp->status_blk_mapping);
if (bnapi->status_blk.msi)
bnapi->status_blk.msi = NULL;
bp->stats_blk = NULL;
}
}
static int
bnx2_alloc_mem(struct bnx2 *bp)
{
int i, status_blk_size, err;
int i, err;
struct bnx2_napi *bnapi;
void *status_blk;
/* Combine status and statistics blocks into one allocation. */
status_blk_size = L1_CACHE_ALIGN(sizeof(struct status_block));
if (bp->flags & BNX2_FLAG_MSIX_CAP)
status_blk_size = L1_CACHE_ALIGN(BNX2_MAX_MSIX_HW_VEC *
BNX2_SBLK_MSIX_ALIGN_SIZE);
bp->status_stats_size = status_blk_size +
sizeof(struct statistics_block);
status_blk = dma_zalloc_coherent(&bp->pdev->dev, bp->status_stats_size,
&bp->status_blk_mapping, GFP_KERNEL);
if (status_blk == NULL)
goto alloc_mem_err;
bnapi = &bp->bnx2_napi[0];
bnapi->status_blk.msi = status_blk;
bnapi->status_blk.msi = bp->status_blk;
bnapi->hw_tx_cons_ptr =
&bnapi->status_blk.msi->status_tx_quick_consumer_index0;
bnapi->hw_rx_cons_ptr =
@ -870,7 +892,7 @@ bnx2_alloc_mem(struct bnx2 *bp)
bnapi = &bp->bnx2_napi[i];
sblk = (status_blk + BNX2_SBLK_MSIX_ALIGN_SIZE * i);
sblk = (bp->status_blk + BNX2_SBLK_MSIX_ALIGN_SIZE * i);
bnapi->status_blk.msix = sblk;
bnapi->hw_tx_cons_ptr =
&sblk->status_tx_quick_consumer_index;
@ -880,10 +902,6 @@ bnx2_alloc_mem(struct bnx2 *bp)
}
}
bp->stats_blk = status_blk + status_blk_size;
bp->stats_blk_mapping = bp->status_blk_mapping + status_blk_size;
if (BNX2_CHIP(bp) == BNX2_CHIP_5709) {
bp->ctx_pages = 0x2000 / BNX2_PAGE_SIZE;
if (bp->ctx_pages == 0)
@ -8330,6 +8348,11 @@ bnx2_init_board(struct pci_dev *pdev, struct net_device *dev)
bp->phy_addr = 1;
/* allocate stats_blk */
rc = bnx2_alloc_stats_blk(dev);
if (rc)
goto err_out_unmap;
/* Disable WOL support if we are running on a SERDES chip. */
if (BNX2_CHIP(bp) == BNX2_CHIP_5709)
bnx2_get_5709_media(bp);
@ -8586,6 +8609,7 @@ error:
pci_release_regions(pdev);
pci_disable_device(pdev);
err_free:
bnx2_free_stats_blk(dev);
free_netdev(dev);
return rc;
}
@ -8603,6 +8627,7 @@ bnx2_remove_one(struct pci_dev *pdev)
pci_iounmap(bp->pdev, bp->regview);
bnx2_free_stats_blk(dev);
kfree(bp->temp_stats_blk);
if (bp->flags & BNX2_FLAG_AER_ENABLED) {

1
drivers/net/ethernet/broadcom/bnx2.h
View File

@ -6928,6 +6928,7 @@ struct bnx2 {
dma_addr_t status_blk_mapping;
void *status_blk;
struct statistics_block *stats_blk;
struct statistics_block *temp_stats_blk;
dma_addr_t stats_blk_mapping;