[PATCH] ia64: sn/pci/pcibr/pcibr_reg.c: check null pointer dereference
From: Cong Ding
Date: Mon Jan 14 2013 - 12:53:10 EST
we should ensure the pointer is not null before the first use, rather than
after it.
Signed-off-by: Cong Ding <dinggnu@xxxxxxxxx>
---
arch/ia64/sn/pci/pcibr/pcibr_reg.c | 29 +++++++++++------------------
1 file changed, 11 insertions(+), 18 deletions(-)
diff --git a/arch/ia64/sn/pci/pcibr/pcibr_reg.c b/arch/ia64/sn/pci/pcibr/pcibr_reg.c
index 8b8bbd5..b33ee60 100644
--- a/arch/ia64/sn/pci/pcibr/pcibr_reg.c
+++ b/arch/ia64/sn/pci/pcibr/pcibr_reg.c
@@ -25,9 +25,8 @@ union br_ptr {
*/
void pcireg_control_bit_clr(struct pcibus_info *pcibus_info, u64 bits)
{
- union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
-
if (pcibus_info) {
+ union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
switch (pcibus_info->pbi_bridge_type) {
case PCIBR_BRIDGETYPE_TIOCP:
__sn_clrq_relaxed(&ptr->tio.cp_control, bits);
@@ -45,9 +44,8 @@ void pcireg_control_bit_clr(struct pcibus_info *pcibus_info, u64 bits)
void pcireg_control_bit_set(struct pcibus_info *pcibus_info, u64 bits)
{
- union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
-
if (pcibus_info) {
+ union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
switch (pcibus_info->pbi_bridge_type) {
case PCIBR_BRIDGETYPE_TIOCP:
__sn_setq_relaxed(&ptr->tio.cp_control, bits);
@@ -68,10 +66,10 @@ void pcireg_control_bit_set(struct pcibus_info *pcibus_info, u64 bits)
*/
u64 pcireg_tflush_get(struct pcibus_info *pcibus_info)
{
- union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
u64 ret = 0;
if (pcibus_info) {
+ union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
switch (pcibus_info->pbi_bridge_type) {
case PCIBR_BRIDGETYPE_TIOCP:
ret = __sn_readq_relaxed(&ptr->tio.cp_tflush);
@@ -98,10 +96,10 @@ u64 pcireg_tflush_get(struct pcibus_info *pcibus_info)
*/
u64 pcireg_intr_status_get(struct pcibus_info * pcibus_info)
{
- union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
u64 ret = 0;
if (pcibus_info) {
+ union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
switch (pcibus_info->pbi_bridge_type) {
case PCIBR_BRIDGETYPE_TIOCP:
ret = __sn_readq_relaxed(&ptr->tio.cp_int_status);
@@ -123,9 +121,8 @@ u64 pcireg_intr_status_get(struct pcibus_info * pcibus_info)
*/
void pcireg_intr_enable_bit_clr(struct pcibus_info *pcibus_info, u64 bits)
{
- union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
-
if (pcibus_info) {
+ union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
switch (pcibus_info->pbi_bridge_type) {
case PCIBR_BRIDGETYPE_TIOCP:
__sn_clrq_relaxed(&ptr->tio.cp_int_enable, bits);
@@ -143,9 +140,8 @@ void pcireg_intr_enable_bit_clr(struct pcibus_info *pcibus_info, u64 bits)
void pcireg_intr_enable_bit_set(struct pcibus_info *pcibus_info, u64 bits)
{
- union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
-
if (pcibus_info) {
+ union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
switch (pcibus_info->pbi_bridge_type) {
case PCIBR_BRIDGETYPE_TIOCP:
__sn_setq_relaxed(&ptr->tio.cp_int_enable, bits);
@@ -167,9 +163,8 @@ void pcireg_intr_enable_bit_set(struct pcibus_info *pcibus_info, u64 bits)
void pcireg_intr_addr_addr_set(struct pcibus_info *pcibus_info, int int_n,
u64 addr)
{
- union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
-
if (pcibus_info) {
+ union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
switch (pcibus_info->pbi_bridge_type) {
case PCIBR_BRIDGETYPE_TIOCP:
__sn_clrq_relaxed(&ptr->tio.cp_int_addr[int_n],
@@ -196,9 +191,8 @@ void pcireg_intr_addr_addr_set(struct pcibus_info *pcibus_info, int int_n,
*/
void pcireg_force_intr_set(struct pcibus_info *pcibus_info, int int_n)
{
- union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
-
if (pcibus_info) {
+ union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
switch (pcibus_info->pbi_bridge_type) {
case PCIBR_BRIDGETYPE_TIOCP:
writeq(1, &ptr->tio.cp_force_pin[int_n]);
@@ -219,10 +213,10 @@ void pcireg_force_intr_set(struct pcibus_info *pcibus_info, int int_n)
*/
u64 pcireg_wrb_flush_get(struct pcibus_info *pcibus_info, int device)
{
- union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
u64 ret = 0;
if (pcibus_info) {
+ union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
switch (pcibus_info->pbi_bridge_type) {
case PCIBR_BRIDGETYPE_TIOCP:
ret =
@@ -244,9 +238,8 @@ u64 pcireg_wrb_flush_get(struct pcibus_info *pcibus_info, int device)
void pcireg_int_ate_set(struct pcibus_info *pcibus_info, int ate_index,
u64 val)
{
- union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
-
if (pcibus_info) {
+ union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
switch (pcibus_info->pbi_bridge_type) {
case PCIBR_BRIDGETYPE_TIOCP:
writeq(val, &ptr->tio.cp_int_ate_ram[ate_index]);
@@ -264,10 +257,10 @@ void pcireg_int_ate_set(struct pcibus_info *pcibus_info, int ate_index,
u64 __iomem *pcireg_int_ate_addr(struct pcibus_info *pcibus_info, int ate_index)
{
- union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
u64 __iomem *ret = NULL;
if (pcibus_info) {
+ union br_ptr __iomem *ptr = (union br_ptr __iomem *)pcibus_info->pbi_buscommon.bs_base;
switch (pcibus_info->pbi_bridge_type) {
case PCIBR_BRIDGETYPE_TIOCP:
ret = &ptr->tio.cp_int_ate_ram[ate_index];
--
1.7.9.5
--
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