diff --git a/os_dep/osdep_service.c b/os_dep/osdep_service.c
index 0d11234..e4893a7 100644
--- a/os_dep/osdep_service.c
+++ b/os_dep/osdep_service.c
@@ -1957,13 +1957,8 @@ static int isFileReadable(char *path)
 		ret = PTR_ERR(fp);
 	}
 	else {
-		oldfs = get_fs(); set_fs(KERNEL_DS);
-		
-		if(1!=readFile(fp, &buf, 1))
-			ret = PTR_ERR(fp);
-		
-		set_fs(oldfs);
-		filp_close(fp,NULL);
+		ret = kernel_read(fp, &buf, 1, NULL);
+		closeFile(fp);
 	}	
 	return ret;
 }
@@ -1984,10 +1979,7 @@ static int retriveFromFile(char *path, u8* buf, u32 sz)
 	if(path && buf) {
 		if( 0 == (ret=openFile(&fp,path, O_RDONLY, 0)) ){
 			DBG_871X("%s openFile path:%s fp=%p\n",__FUNCTION__, path ,fp);
-
-			oldfs = get_fs(); set_fs(KERNEL_DS);
-			ret=readFile(fp, buf, sz);
-			set_fs(oldfs);
+			ret = kernel_read(fp, buf, sz, NULL);
 			closeFile(fp);
 			
 			DBG_871X("%s readFile, ret:%d\n",__FUNCTION__, ret);
@@ -2018,10 +2010,7 @@ static int storeToFile(char *path, u8* buf, u32 sz)
 	if(path && buf) {
 		if( 0 == (ret=openFile(&fp, path, O_CREAT|O_WRONLY, 0666)) ) {
 			DBG_871X("%s openFile path:%s fp=%p\n",__FUNCTION__, path ,fp);
-
-			oldfs = get_fs(); set_fs(KERNEL_DS);
-			ret=writeFile(fp, buf, sz);
-			set_fs(oldfs);
+			ret = kernel_write(fp, buf, sz, NULL);
 			closeFile(fp);
 
 			DBG_871X("%s writeFile, ret:%d\n",__FUNCTION__, ret);