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Date: Mon, 28 Sep 2015 15:01:50 +0800
From: Weidong Wang <wangweidong1@...wei.com>
To: <sony.chacko@...gic.com>, <Dept-HSGLinuxNICDev@...gic.com>,
David Miller <davem@...emloft.net>
CC: <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
<rui.xiang@...wei.com>, <manish.chopra@...gic.com>
Subject: [PATCH net-next v2] BNX2: fix a Null Pointer for stats_blk
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: Tianhong Ding <dingtianhong@...wei.com>
---
Change in v2:
- Use Allocate the statistics block instead of spinlock, which
suggested by David Miller.
- Updating commit message according to changes.
---
drivers/net/ethernet/broadcom/bnx2.c | 61 +++++++++++++++++++++++-------------
1 file changed, 40 insertions(+), 21 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnx2.c b/drivers/net/ethernet/broadcom/bnx2.c
index 2b66ef3..1f33982 100644
--- a/drivers/net/ethernet/broadcom/bnx2.c
+++ b/drivers/net/ethernet/broadcom/bnx2.c
@@ -813,22 +813,11 @@ bnx2_alloc_rx_mem(struct bnx2 *bp)
}
static void
-bnx2_free_mem(struct bnx2 *bp)
+bnx2_free_stats_blk(struct net_device *dev)
{
- int i;
+ struct bnx2 *bp = netdev_priv(dev);
struct bnx2_napi *bnapi = &bp->bnx2_napi[0];
- bnx2_free_tx_mem(bp);
- bnx2_free_rx_mem(bp);
-
- for (i = 0; i < bp->ctx_pages; i++) {
- if (bp->ctx_blk[i]) {
- dma_free_coherent(&bp->pdev->dev, BNX2_PAGE_SIZE,
- bp->ctx_blk[i],
- bp->ctx_blk_mapping[i]);
- bp->ctx_blk[i] = NULL;
- }
- }
if (bnapi->status_blk.msi) {
dma_free_coherent(&bp->pdev->dev, bp->status_stats_size,
bnapi->status_blk.msi,
@@ -839,11 +828,12 @@ bnx2_free_mem(struct bnx2 *bp)
}
static int
-bnx2_alloc_mem(struct bnx2 *bp)
+bnx2_alloc_stats_blk(struct net_device *dev)
{
- int i, status_blk_size, err;
+ int i, status_blk_size;
struct bnx2_napi *bnapi;
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));
@@ -852,11 +842,10 @@ bnx2_alloc_mem(struct bnx2 *bp)
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;
+ return -ENOMEM;
bnapi = &bp->bnx2_napi[0];
bnapi->status_blk.msi = status_blk;
@@ -865,11 +854,10 @@ bnx2_alloc_mem(struct bnx2 *bp)
bnapi->hw_rx_cons_ptr =
&bnapi->status_blk.msi->status_rx_quick_consumer_index0;
if (bp->flags & BNX2_FLAG_MSIX_CAP) {
- for (i = 1; i < bp->irq_nvecs; i++) {
+ for (i = 1; i < BNX2_MAX_MSIX_HW_VEC; i++) {
struct status_block_msix *sblk;
bnapi = &bp->bnx2_napi[i];
-
sblk = (status_blk + BNX2_SBLK_MSIX_ALIGN_SIZE * i);
bnapi->status_blk.msix = sblk;
bnapi->hw_tx_cons_ptr =
@@ -879,11 +867,35 @@ bnx2_alloc_mem(struct bnx2 *bp)
bnapi->int_num = i << 24;
}
}
-
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)
+{
+ int i;
+
+ bnx2_free_tx_mem(bp);
+ bnx2_free_rx_mem(bp);
+
+ for (i = 0; i < bp->ctx_pages; i++) {
+ if (bp->ctx_blk[i]) {
+ dma_free_coherent(&bp->pdev->dev, BNX2_PAGE_SIZE,
+ bp->ctx_blk[i],
+ bp->ctx_blk_mapping[i]);
+ bp->ctx_blk[i] = NULL;
+ }
+ }
+}
+
+static int
+bnx2_alloc_mem(struct bnx2 *bp)
+{
+ int i, err;
+
if (BNX2_CHIP(bp) == BNX2_CHIP_5709) {
bp->ctx_pages = 0x2000 / BNX2_PAGE_SIZE;
if (bp->ctx_pages == 0)
@@ -8330,6 +8342,11 @@ 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 +8603,7 @@ error:
pci_release_regions(pdev);
pci_disable_device(pdev);
err_free:
+ bnx2_free_stats_blk(dev);
free_netdev(dev);
return rc;
}
@@ -8603,6 +8621,7 @@ 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) {
--
1.9.0
--
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