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authorYuval Mintz <yuvalmin@broadcom.com>2013-04-22 06:53:03 +0400
committerDavid S. Miller <davem@davemloft.net>2013-04-25 12:00:56 +0400
commitecf01c22be034690b621d92c9ff488d607a9995a (patch)
treee05899b77655c080a421f33fddebc396c582d6b8 /drivers
parente56db277684895184bc74fcf74f7ef993e3a5b6c (diff)
downloadlinux-ecf01c22be034690b621d92c9ff488d607a9995a.tar.xz
bnx2x: Prevent NULL pointer dereference in kdump
In scenarios in which a previous driver was removed without proper cleanup (e.g., kdump), it is possible for the chip to generate an interrupt without any apparent reason once interrupts are requested. Due to an erroneous initialization of resources, some of the bnx2x structs which are required for interrupt handling are initialized only after an interface's interrupt is requested from the OS. As a result, once such a spurious interrupt occurs, it will cause a NULL pointer dereference - the driver will access those structs in its interrupt handling routine. This patch change the interrupt request scheme so that bnx2x would only request interrupts from the kernel after it has finished initializing all the inner structs required for interrupt handling. Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com> Signed-off-by: Ariel Elior <ariele@broadcom.com> Signed-off-by: Eilon Greenstein <eilong@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c11
-rw-r--r--drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h19
-rw-r--r--drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c32
3 files changed, 39 insertions, 23 deletions
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
index 57619dd4a92b..51a6030138e3 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -1037,6 +1037,7 @@ static irqreturn_t bnx2x_msix_fp_int(int irq, void *fp_cookie)
DP(NETIF_MSG_INTR,
"got an MSI-X interrupt on IDX:SB [fp %d fw_sd %d igusb %d]\n",
fp->index, fp->fw_sb_id, fp->igu_sb_id);
+
bnx2x_ack_sb(bp, fp->igu_sb_id, USTORM_ID, 0, IGU_INT_DISABLE, 0);
#ifdef BNX2X_STOP_ON_ERROR
@@ -1718,7 +1719,7 @@ static int bnx2x_req_irq(struct bnx2x *bp)
return request_irq(irq, bnx2x_interrupt, flags, bp->dev->name, bp->dev);
}
-static int bnx2x_setup_irqs(struct bnx2x *bp)
+int bnx2x_setup_irqs(struct bnx2x *bp)
{
int rc = 0;
if (bp->flags & USING_MSIX_FLAG &&
@@ -2574,6 +2575,8 @@ int bnx2x_nic_load(struct bnx2x *bp, int load_mode)
}
}
+ bnx2x_pre_irq_nic_init(bp);
+
/* Connect to IRQs */
rc = bnx2x_setup_irqs(bp);
if (rc) {
@@ -2583,11 +2586,11 @@ int bnx2x_nic_load(struct bnx2x *bp, int load_mode)
LOAD_ERROR_EXIT(bp, load_error2);
}
- /* Setup NIC internals and enable interrupts */
- bnx2x_nic_init(bp, load_code);
-
/* Init per-function objects */
if (IS_PF(bp)) {
+ /* Setup NIC internals and enable interrupts */
+ bnx2x_post_irq_nic_init(bp, load_code);
+
bnx2x_init_bp_objs(bp);
bnx2x_iov_nic_init(bp);
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h
index aee7671ff4c1..c3a65d04c8c9 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h
@@ -295,16 +295,29 @@ void bnx2x_int_disable_sync(struct bnx2x *bp, int disable_hw);
void bnx2x_nic_init_cnic(struct bnx2x *bp);
/**
- * bnx2x_nic_init - init driver internals.
+ * bnx2x_preirq_nic_init - init driver internals.
*
* @bp: driver handle
*
* Initializes:
- * - rings
+ * - fastpath object
+ * - fastpath rings
+ * etc.
+ */
+void bnx2x_pre_irq_nic_init(struct bnx2x *bp);
+
+/**
+ * bnx2x_postirq_nic_init - init driver internals.
+ *
+ * @bp: driver handle
+ * @load_code: COMMON, PORT or FUNCTION
+ *
+ * Initializes:
* - status blocks
+ * - slowpath rings
* - etc.
*/
-void bnx2x_nic_init(struct bnx2x *bp, u32 load_code);
+void bnx2x_post_irq_nic_init(struct bnx2x *bp, u32 load_code);
/**
* bnx2x_alloc_mem_cnic - allocate driver's memory for cnic.
*
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
index c50696b396f1..a8f1ee31de77 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
@@ -6018,10 +6018,11 @@ void bnx2x_nic_init_cnic(struct bnx2x *bp)
mmiowb();
}
-void bnx2x_nic_init(struct bnx2x *bp, u32 load_code)
+void bnx2x_pre_irq_nic_init(struct bnx2x *bp)
{
int i;
+ /* Setup NIC internals and enable interrupts */
for_each_eth_queue(bp, i)
bnx2x_init_eth_fp(bp, i);
@@ -6030,17 +6031,21 @@ void bnx2x_nic_init(struct bnx2x *bp, u32 load_code)
bnx2x_init_rx_rings(bp);
bnx2x_init_tx_rings(bp);
- if (IS_VF(bp))
- return;
+ if (IS_PF(bp)) {
+ /* Initialize MOD_ABS interrupts */
+ bnx2x_init_mod_abs_int(bp, &bp->link_vars, bp->common.chip_id,
+ bp->common.shmem_base,
+ bp->common.shmem2_base, BP_PORT(bp));
- /* Initialize MOD_ABS interrupts */
- bnx2x_init_mod_abs_int(bp, &bp->link_vars, bp->common.chip_id,
- bp->common.shmem_base, bp->common.shmem2_base,
- BP_PORT(bp));
+ /* initialize the default status block and sp ring */
+ bnx2x_init_def_sb(bp);
+ bnx2x_update_dsb_idx(bp);
+ bnx2x_init_sp_ring(bp);
+ }
+}
- bnx2x_init_def_sb(bp);
- bnx2x_update_dsb_idx(bp);
- bnx2x_init_sp_ring(bp);
+void bnx2x_post_irq_nic_init(struct bnx2x *bp, u32 load_code)
+{
bnx2x_init_eq_ring(bp);
bnx2x_init_internal(bp, load_code);
bnx2x_pf_init(bp);
@@ -6058,12 +6063,7 @@ void bnx2x_nic_init(struct bnx2x *bp, u32 load_code)
AEU_INPUTS_ATTN_BITS_SPIO5);
}
-/* end of nic init */
-
-/*
- * gzip service functions
- */
-
+/* gzip service functions */
static int bnx2x_gunzip_init(struct bnx2x *bp)
{
bp->gunzip_buf = dma_alloc_coherent(&bp->pdev->dev, FW_BUF_SIZE,