[PATCH] Need proper type casting before assignment, Remove compilation Warning.

Arvind Yadav arvind.yadav.cs at gmail.com
Fri Jul 8 03:01:11 AEST 2016

-Return type of 'qe_muram_alloc' is 'unsigned long', That Was trying to
assigned in ucc_fast_tx_virtual_fifo_base_offset and
ucc_fast_rx_virtual_fifo_base_offset. These variable are 'unsigned int'.
So before assginment need a proper type casting.

-Passing value in IS_ERR_VALUE() is wrong, as they pass an '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.cs at gmail.com>
 drivers/soc/fsl/qe/ucc_fast.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/soc/fsl/qe/ucc_fast.c b/drivers/soc/fsl/qe/ucc_fast.c
index a768931..98eed25 100644
--- a/drivers/soc/fsl/qe/ucc_fast.c
+++ b/drivers/soc/fsl/qe/ucc_fast.c
@@ -267,8 +267,10 @@ 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)) {
+		(unsigned int)qe_muram_alloc(uf_info->utfs,
+		(unsigned long)uccf->ucc_fast_tx_virtual_fifo_base_offset)) {
 		printk(KERN_ERR "%s: cannot allocate MURAM for TX FIFO\n",
 		uccf->ucc_fast_tx_virtual_fifo_base_offset = 0;
@@ -278,10 +280,11 @@ int ucc_fast_init(struct ucc_fast_info * uf_info, struct ucc_fast_private ** ucc
 	/* Allocate memory for Rx Virtual Fifo */
 	uccf->ucc_fast_rx_virtual_fifo_base_offset =
-		qe_muram_alloc(uf_info->urfs +
+		(unsigned int)qe_muram_alloc(uf_info->urfs +
-	if (IS_ERR_VALUE(uccf->ucc_fast_rx_virtual_fifo_base_offset)) {
+		(unsigned long)uccf->ucc_fast_rx_virtual_fifo_base_offset)) {
 		printk(KERN_ERR "%s: cannot allocate MURAM for RX FIFO\n",
 		uccf->ucc_fast_rx_virtual_fifo_base_offset = 0;

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