IS_ERR_VALUE() assumes that its parameter is an unsigned long.
It can not be used to check if an 'unsigned int' reflects an error.
As they pass an 'unsigned int' into a function that takes an
'unsigned long' argument. This happens to work because the type
is sign-extended on 64-bit architectures before it gets converted
into an unsigned type.
However, anything that passes an 'unsigned short' or 'unsigned int'
argument into IS_ERR_VALUE() is guaranteed to be broken, as are
8-bit integers and types that are wider than 'unsigned long'.
It would be nice to any users that are not passing 'unsigned int'
arguments.
Passing value in IS_ERR_VALUE() is wrong, as they pass an
'unsigned int' into a function that takes an 'unsigned long'
argument.This happens to work because the type is sign-extended
on 64-bit architectures before it gets converted into an
unsigned type.
Passing an 'unsigned short' or 'unsigned int'argument into
IS_ERR_VALUE() is guaranteed to be broken, as are 8-bit integers
and types that are wider than 'unsigned long'.
Any user will get compilation warning for that do not pass an
unsigned long' argument.
Signed-off-by: Arvind Yadav <arvind.yadav...@gmail.com>
---
drivers/bcma/scan.c | 2 --
drivers/net/ethernet/freescale/ucc_geth.c | 30 +++++++++++++++---------------
drivers/soc/fsl/qe/ucc_fast.c | 4 ++--
include/linux/err.h | 1 +
4 files changed, 18 insertions(+), 19 deletions(-)
diff --git a/drivers/bcma/scan.c b/drivers/bcma/scan.c
index 4a2d1b2..319d78e 100644
--- a/drivers/bcma/scan.c
+++ b/drivers/bcma/scan.c
@@ -272,8 +272,6 @@ static struct bcma_device *bcma_find_core_reverse(struct
bcma_bus *bus, u16 core
return NULL;
}
-#define IS_ERR_VALUE_U32(x) ((x) >= (u32)-MAX_ERRNO)
-
static int bcma_get_next_core(struct bcma_bus *bus, u32 __iomem **eromptr,
struct bcma_device_id *match, int core_num,
struct bcma_device *core)
diff --git a/drivers/net/ethernet/freescale/ucc_geth.c
b/drivers/net/ethernet/freescale/ucc_geth.c
index 5bf1ade..d290dea 100644
--- a/drivers/net/ethernet/freescale/ucc_geth.c
+++ b/drivers/net/ethernet/freescale/ucc_geth.c
@@ -289,7 +289,7 @@ static int fill_init_enet_entries(struct ucc_geth_private
*ugeth,
else {
init_enet_offset =
qe_muram_alloc(thread_size, thread_alignment);
- if (IS_ERR_VALUE(init_enet_offset)) {
+ if (IS_ERR_VALUE_U32(init_enet_offset)) {
if (netif_msg_ifup(ugeth))
pr_err("Can not allocate DPRAM
memory\n");
qe_put_snum((u8) snum);
@@ -2234,7 +2234,7 @@ static int ucc_geth_alloc_tx(struct ucc_geth_private
*ugeth)
ugeth->tx_bd_ring_offset[j] =
qe_muram_alloc(length,
UCC_GETH_TX_BD_RING_ALIGNMENT);
- if (!IS_ERR_VALUE(ugeth->tx_bd_ring_offset[j]))
+ if (!IS_ERR_VALUE_U32(ugeth->tx_bd_ring_offset[j]))
ugeth->p_tx_bd_ring[j] =
(u8 __iomem *) qe_muram_addr(ugeth->
tx_bd_ring_offset[j]);
@@ -2311,7 +2311,7 @@ static int ucc_geth_alloc_rx(struct ucc_geth_private
*ugeth)
ugeth->rx_bd_ring_offset[j] =
qe_muram_alloc(length,
UCC_GETH_RX_BD_RING_ALIGNMENT);
- if (!IS_ERR_VALUE(ugeth->rx_bd_ring_offset[j]))
+ if (!IS_ERR_VALUE_U32(ugeth->rx_bd_ring_offset[j]))
ugeth->p_rx_bd_ring[j] =
(u8 __iomem *) qe_muram_addr(ugeth->
rx_bd_ring_offset[j]);
@@ -2521,7 +2521,7 @@ static int ucc_geth_startup(struct ucc_geth_private
*ugeth)
ugeth->tx_glbl_pram_offset =
qe_muram_alloc(sizeof(struct ucc_geth_tx_global_pram),
UCC_GETH_TX_GLOBAL_PRAM_ALIGNMENT);
- if (IS_ERR_VALUE(ugeth->tx_glbl_pram_offset)) {
+ if (IS_ERR_VALUE_U32(ugeth->tx_glbl_pram_offset)) {
if (netif_msg_ifup(ugeth))
pr_err("Can not allocate DPRAM memory for
p_tx_glbl_pram\n");
return -ENOMEM;
@@ -2541,7 +2541,7 @@ static int ucc_geth_startup(struct ucc_geth_private
*ugeth)
sizeof(struct ucc_geth_thread_data_tx) +
32 * (numThreadsTxNumerical == 1),
UCC_GETH_THREAD_DATA_ALIGNMENT);
- if (IS_ERR_VALUE(ugeth->thread_dat_tx_offset)) {
+ if (IS_ERR_VALUE_U32(ugeth->thread_dat_tx_offset)) {
if (netif_msg_ifup(ugeth))
pr_err("Can not allocate DPRAM memory for
p_thread_data_tx\n");
return -ENOMEM;
@@ -2568,7 +2568,7 @@ static int ucc_geth_startup(struct ucc_geth_private
*ugeth)
qe_muram_alloc(ug_info->numQueuesTx *
sizeof(struct ucc_geth_send_queue_qd),
UCC_GETH_SEND_QUEUE_QUEUE_DESCRIPTOR_ALIGNMENT);
- if (IS_ERR_VALUE(ugeth->send_q_mem_reg_offset)) {
+ if (IS_ERR_VALUE_U32(ugeth->send_q_mem_reg_offset)) {
if (netif_msg_ifup(ugeth))
pr_err("Can not allocate DPRAM memory for
p_send_q_mem_reg\n");
return -ENOMEM;
@@ -2609,7 +2609,7 @@ static int ucc_geth_startup(struct ucc_geth_private
*ugeth)
ugeth->scheduler_offset =
qe_muram_alloc(sizeof(struct ucc_geth_scheduler),
UCC_GETH_SCHEDULER_ALIGNMENT);
- if (IS_ERR_VALUE(ugeth->scheduler_offset)) {
+ if (IS_ERR_VALUE_U32(ugeth->scheduler_offset)) {
if (netif_msg_ifup(ugeth))
pr_err("Can not allocate DPRAM memory for
p_scheduler\n");
return -ENOMEM;
@@ -2656,7 +2656,7 @@ static int ucc_geth_startup(struct ucc_geth_private
*ugeth)
qe_muram_alloc(sizeof
(struct
ucc_geth_tx_firmware_statistics_pram),
UCC_GETH_TX_STATISTICS_ALIGNMENT);
- if (IS_ERR_VALUE(ugeth->tx_fw_statistics_pram_offset)) {
+ if (IS_ERR_VALUE_U32(ugeth->tx_fw_statistics_pram_offset)) {
if (netif_msg_ifup(ugeth))
pr_err("Can not allocate DPRAM memory for
p_tx_fw_statistics_pram\n");
return -ENOMEM;
@@ -2693,7 +2693,7 @@ static int ucc_geth_startup(struct ucc_geth_private
*ugeth)
ugeth->rx_glbl_pram_offset =
qe_muram_alloc(sizeof(struct ucc_geth_rx_global_pram),
UCC_GETH_RX_GLOBAL_PRAM_ALIGNMENT);
- if (IS_ERR_VALUE(ugeth->rx_glbl_pram_offset)) {
+ if (IS_ERR_VALUE_U32(ugeth->rx_glbl_pram_offset)) {
if (netif_msg_ifup(ugeth))
pr_err("Can not allocate DPRAM memory for
p_rx_glbl_pram\n");
return -ENOMEM;
@@ -2712,7 +2712,7 @@ static int ucc_geth_startup(struct ucc_geth_private
*ugeth)
qe_muram_alloc(numThreadsRxNumerical *
sizeof(struct ucc_geth_thread_data_rx),
UCC_GETH_THREAD_DATA_ALIGNMENT);
- if (IS_ERR_VALUE(ugeth->thread_dat_rx_offset)) {
+ if (IS_ERR_VALUE_U32(ugeth->thread_dat_rx_offset)) {
if (netif_msg_ifup(ugeth))
pr_err("Can not allocate DPRAM memory for
p_thread_data_rx\n");
return -ENOMEM;
@@ -2733,7 +2733,7 @@ static int ucc_geth_startup(struct ucc_geth_private
*ugeth)
qe_muram_alloc(sizeof
(struct
ucc_geth_rx_firmware_statistics_pram),
UCC_GETH_RX_STATISTICS_ALIGNMENT);
- if (IS_ERR_VALUE(ugeth->rx_fw_statistics_pram_offset)) {
+ if (IS_ERR_VALUE_U32(ugeth->rx_fw_statistics_pram_offset)) {
if (netif_msg_ifup(ugeth))
pr_err("Can not allocate DPRAM memory for
p_rx_fw_statistics_pram\n");
return -ENOMEM;
@@ -2753,7 +2753,7 @@ static int ucc_geth_startup(struct ucc_geth_private
*ugeth)
qe_muram_alloc(ug_info->numQueuesRx *
sizeof(struct ucc_geth_rx_interrupt_coalescing_entry)
+ 4, UCC_GETH_RX_INTERRUPT_COALESCING_ALIGNMENT);
- if (IS_ERR_VALUE(ugeth->rx_irq_coalescing_tbl_offset)) {
+ if (IS_ERR_VALUE_U32(ugeth->rx_irq_coalescing_tbl_offset)) {
if (netif_msg_ifup(ugeth))
pr_err("Can not allocate DPRAM memory for
p_rx_irq_coalescing_tbl\n");
return -ENOMEM;
@@ -2819,7 +2819,7 @@ static int ucc_geth_startup(struct ucc_geth_private
*ugeth)
(sizeof(struct ucc_geth_rx_bd_queues_entry) +
sizeof(struct ucc_geth_rx_prefetched_bds)),
UCC_GETH_RX_BD_QUEUES_ALIGNMENT);
- if (IS_ERR_VALUE(ugeth->rx_bd_qs_tbl_offset)) {
+ if (IS_ERR_VALUE_U32(ugeth->rx_bd_qs_tbl_offset)) {
if (netif_msg_ifup(ugeth))
pr_err("Can not allocate DPRAM memory for
p_rx_bd_qs_tbl\n");
return -ENOMEM;
@@ -2905,7 +2905,7 @@ static int ucc_geth_startup(struct ucc_geth_private
*ugeth)
ugeth->exf_glbl_param_offset =
qe_muram_alloc(sizeof(struct ucc_geth_exf_global_pram),
UCC_GETH_RX_EXTENDED_FILTERING_GLOBAL_PARAMETERS_ALIGNMENT);
- if (IS_ERR_VALUE(ugeth->exf_glbl_param_offset)) {
+ if (IS_ERR_VALUE_U32(ugeth->exf_glbl_param_offset)) {
if (netif_msg_ifup(ugeth))
pr_err("Can not allocate DPRAM memory for
p_exf_glbl_param\n");
return -ENOMEM;
@@ -3039,7 +3039,7 @@ static int ucc_geth_startup(struct ucc_geth_private
*ugeth)
/* Allocate InitEnet command parameter structure */
init_enet_pram_offset = qe_muram_alloc(sizeof(struct
ucc_geth_init_pram), 4);
- if (IS_ERR_VALUE(init_enet_pram_offset)) {
+ if (IS_ERR_VALUE_U32(init_enet_pram_offset)) {
if (netif_msg_ifup(ugeth))
pr_err("Can not allocate DPRAM memory for
p_init_enet_pram\n");
return -ENOMEM;
diff --git a/drivers/soc/fsl/qe/ucc_fast.c b/drivers/soc/fsl/qe/ucc_fast.c
index a768931..f7fa59f 100644
--- a/drivers/soc/fsl/qe/ucc_fast.c
+++ b/drivers/soc/fsl/qe/ucc_fast.c
@@ -268,7 +268,7 @@ int ucc_fast_init(struct ucc_fast_info * uf_info, struct
ucc_fast_private ** ucc
/* Allocate memory for Tx Virtual Fifo */
uccf->ucc_fast_tx_virtual_fifo_base_offset =
qe_muram_alloc(uf_info->utfs, UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT);
- if (IS_ERR_VALUE(uccf->ucc_fast_tx_virtual_fifo_base_offset)) {
+ if (IS_ERR_VALUE_U32(uccf->ucc_fast_tx_virtual_fifo_base_offset)) {
printk(KERN_ERR "%s: cannot allocate MURAM for TX FIFO\n",
__func__);
uccf->ucc_fast_tx_virtual_fifo_base_offset = 0;
@@ -281,7 +281,7 @@ int ucc_fast_init(struct ucc_fast_info * uf_info, struct
ucc_fast_private ** ucc
qe_muram_alloc(uf_info->urfs +
UCC_FAST_RECEIVE_VIRTUAL_FIFO_SIZE_FUDGE_FACTOR,
UCC_FAST_VIRT_FIFO_REGS_ALIGNMENT);
- if (IS_ERR_VALUE(uccf->ucc_fast_rx_virtual_fifo_base_offset)) {
+ if (IS_ERR_VALUE_U32(uccf->ucc_fast_rx_virtual_fifo_base_offset)) {
printk(KERN_ERR "%s: cannot allocate MURAM for RX FIFO\n",
__func__);
uccf->ucc_fast_rx_virtual_fifo_base_offset = 0;
diff --git a/include/linux/err.h b/include/linux/err.h
index 1e35588..a42f942 100644
--- a/include/linux/err.h
+++ b/include/linux/err.h
@@ -19,6 +19,7 @@
#ifndef __ASSEMBLY__
#define IS_ERR_VALUE(x) unlikely((unsigned long)(void *)(x) >= (unsigned
long)-MAX_ERRNO)
+#define IS_ERR_VALUE_U32(x) unlikely((unsigned int)(x) >= (unsigned
int)-MAX_ERRNO)
static inline void * __must_check ERR_PTR(long error)
{
--
1.9.1
